Coordination Complexes: Neutral or negatively charged ligands bonded to metal cations or neutral atoms. The number of ligand atoms to which the metal center is directly bonded is the metal cation's coordination number, and this number is always greater than the regular valence or oxidation number of the metal. A coordination complex can be negative, neutral, or positively charged.Chemical EngineeringOrganometallic Compounds: A class of compounds of the type R-M, where a C atom is joined directly to any other element except H, C, N, O, F, Cl, Br, I, or At. (Grant & Hackh's Chemical Dictionary, 5th ed)Picolinic AcidsChelating Agents: Chemicals that bind to and remove ions from solutions. Many chelating agents function through the formation of COORDINATION COMPLEXES with METALS.Metals: Electropositive chemical elements characterized by ductility, malleability, luster, and conductance of heat and electricity. They can replace the hydrogen of an acid and form bases with hydroxyl radicals. (Grant & Hackh's Chemical Dictionary, 5th ed)Encyclopedias as Topic: Works containing information articles on subjects in every field of knowledge, usually arranged in alphabetical order, or a similar work limited to a special field or subject. (From The ALA Glossary of Library and Information Science, 1983)Transition Elements: Elements with partially filled d orbitals. They constitute groups 3-12 of the periodic table of elements.Actinoid Series Elements: A series of radioactive elements from ACTINIUM, atomic number 89, to and including LAWRENCIUM, atomic number 103.Electrons: Stable elementary particles having the smallest known negative charge, present in all elements; also called negatrons. Positively charged electrons are called positrons. The numbers, energies and arrangement of electrons around atomic nuclei determine the chemical identities of elements. Beams of electrons are called CATHODE RAYS.Hydrogen Bonding: A low-energy attractive force between hydrogen and another element. It plays a major role in determining the properties of water, proteins, and other compounds.Fluorides: Inorganic salts of hydrofluoric acid, HF, in which the fluorine atom is in the -1 oxidation state. (McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed) Sodium and stannous salts are commonly used in dentifrices.Quaternary Ammonium Compounds: Derivatives of ammonium compounds, NH4+ Y-, in which all four of the hydrogens bonded to nitrogen have been replaced with hydrocarbyl groups. These are distinguished from IMINES which are RN=CR2.Bees: Insect members of the superfamily Apoidea, found almost everywhere, particularly on flowers. About 3500 species occur in North America. They differ from most WASPS in that their young are fed honey and pollen rather than animal food.Models, Molecular: Models used experimentally or theoretically to study molecular shape, electronic properties, or interactions; includes analogous molecules, computer-generated graphics, and mechanical structures.Captan: One of the phthalimide fungicides.Crystallography, X-Ray: The study of crystal structure using X-RAY DIFFRACTION techniques. (McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed)Copper: A heavy metal trace element with the atomic symbol Cu, atomic number 29, and atomic weight 63.55.Molecular Structure: The location of the atoms, groups or ions relative to one another in a molecule, as well as the number, type and location of covalent bonds.Ligands: A molecule that binds to another molecule, used especially to refer to a small molecule that binds specifically to a larger molecule, e.g., an antigen binding to an antibody, a hormone or neurotransmitter binding to a receptor, or a substrate or allosteric effector binding to an enzyme. Ligands are also molecules that donate or accept a pair of electrons to form a coordinate covalent bond with the central metal atom of a coordination complex. (From Dorland, 27th ed)PhenanthrolinesRhodium: Rhodium. A hard and rare metal of the platinum group, atomic number 45, atomic weight 102.905, symbol Rh. (Dorland, 28th ed)Physics: The study of those aspects of energy and matter in terms of elementary principles and laws. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed)Microscopy, Electron: Microscopy using an electron beam, instead of light, to visualize the sample, thereby allowing much greater magnification. The interactions of ELECTRONS with specimens are used to provide information about the fine structure of that specimen. In TRANSMISSION ELECTRON MICROSCOPY the reactions of the electrons that are transmitted through the specimen are imaged. In SCANNING ELECTRON MICROSCOPY an electron beam falls at a non-normal angle on the specimen and the image is derived from the reactions occurring above the plane of the specimen.Electron Transport: The process by which ELECTRONS are transported from a reduced substrate to molecular OXYGEN. (From Bennington, Saunders Dictionary and Encyclopedia of Laboratory Medicine and Technology, 1984, p270)Mannich Bases: Ketonic amines prepared from the condensation of a ketone with formaldehyde and ammonia or a primary or secondary amine. A Mannich base can act as the equivalent of an alpha,beta unsaturated ketone in synthesis or can be reduced to form physiologically active amino alcohols.Political Systems: The units based on political theory and chosen by countries under which their governmental power is organized and administered to their citizens.Boranes: The collective name for the boron hydrides, which are analogous to the alkanes and silanes. Numerous boranes are known. Some have high calorific values and are used in high-energy fuels. (From Grant & Hackh's Chemical Dictionary, 5th ed)Yttrium: An element of the rare earth family of metals. It has the atomic symbol Y, atomic number 39, and atomic weight 88.91. In conjunction with other rare earths, yttrium is used as a phosphor in television receivers and is a component of the yttrium-aluminum garnet (YAG) lasers.Yttrium Radioisotopes: Unstable isotopes of yttrium that decay or disintegrate emitting radiation. Y atoms with atomic weights 82-88 and 90-96 are radioactive yttrium isotopes.Alkadienes: Acyclic branched or unbranched hydrocarbons having two carbon-carbon double bonds.Dienestrol: A synthetic, non-steroidal estrogen structurally related to stilbestrol. It is used, usually as the cream, in the treatment of menopausal and postmenopausal symptoms.Lanthanoid Series Elements: Elements of the lanthanoid series including atomic number 57 (LANTHANUM) through atomic number 71 (LUTETIUM).Sulfamethoxazole: A bacteriostatic antibacterial agent that interferes with folic acid synthesis in susceptible bacteria. Its broad spectrum of activity has been limited by the development of resistance. (From Martindale, The Extra Pharmacopoeia, 30th ed, p208)Rhodospirillales: An order of photosynthetic bacteria representing a physiological community of predominantly aquatic bacteria.Combretaceae: A plant family of the order Myrtales, subclass Rosidae, class Magnoliopsida. They are mostly trees and shrubs growing in warm areas.Europium: Europium. An element of the rare earth family of metals. It has the atomic symbol Eu, atomic number 63, and atomic weight 152. Europium is used in the form of its salts as coatings for cathode ray tubes and in the form of its organic derivatives as shift reagents in NMR spectroscopy.Terbium: Terbium. An element of the rare earth family of metals. It has the atomic symbol Tb, atomic number 65, and atomic weight 158.92.Amination: The creation of an amine. It can be produced by the addition of an amino group to an organic compound or reduction of a nitro group.Imino AcidsDrug Stability: The chemical and physical integrity of a pharmaceutical product.Technetium Tc 99m Diethyl-iminodiacetic Acid: A nontoxic radiopharmaceutical that is used in the clinical evaluation of hepatobiliary disorders in humans.Acetaldehyde: A colorless, flammable liquid used in the manufacture of acetic acid, perfumes, and flavors. It is also an intermediate in the metabolism of alcohol. It has a general narcotic action and also causes irritation of mucous membranes. Large doses may cause death from respiratory paralysis.Research: Critical and exhaustive investigation or experimentation, having for its aim the discovery of new facts and their correct interpretation, the revision of accepted conclusions, theories, or laws in the light of newly discovered facts, or the practical application of such new or revised conclusions, theories, or laws. (Webster, 3d ed)Egypt: A country in northern Africa, bordering the Mediterranean Sea, between Libya and the Gaza Strip, and the Red Sea north of Sudan, and includes the Asian Sinai Peninsula Its capital is Cairo.Research Personnel: Those individuals engaged in research.Research Support as Topic: Financial support of research activities.Schistosomiasis: Infection with flukes (trematodes) of the genus SCHISTOSOMA. Three species produce the most frequent clinical diseases: SCHISTOSOMA HAEMATOBIUM (endemic in Africa and the Middle East), SCHISTOSOMA MANSONI (in Egypt, northern and southern Africa, some West Indies islands, northern 2/3 of South America), and SCHISTOSOMA JAPONICUM (in Japan, China, the Philippines, Celebes, Thailand, Laos). S. mansoni is often seen in Puerto Ricans living in the United States.Systems Theory: Principles, models, and laws that apply to complex interrelationships and interdependencies of sets of linked components which form a functioning whole, a system. Any system may be composed of components which are systems in their own right (sub-systems), such as several organs within an individual organism.Biomedical Research: Research that involves the application of the natural sciences, especially biology and physiology, to medicine.Methylmercury Compounds: Organic compounds in which mercury is attached to a methyl group.Methanol: A colorless, flammable liquid used in the manufacture of FORMALDEHYDE and ACETIC ACID, in chemical synthesis, antifreeze, and as a solvent. Ingestion of methanol is toxic and may cause blindness.Meningism: A condition characterized by neck stiffness, headache, and other symptoms suggestive of meningeal irritation, but without actual inflammation of the meninges (MENINGITIS). Spinal fluid pressure may be elevated but spinal fluid is normal. (DeJong, The Neurologic Examination, 4th ed, p673)Mercury: A silver metallic element that exists as a liquid at room temperature. It has the atomic symbol Hg (from hydrargyrum, liquid silver), atomic number 80, and atomic weight 200.59. Mercury is used in many industrial applications and its salts have been employed therapeutically as purgatives, antisyphilitics, disinfectants, and astringents. It can be absorbed through the skin and mucous membranes which leads to MERCURY POISONING. Because of its toxicity, the clinical use of mercury and mercurials is diminishing.

Preparation of a promising angiogenesis PET imaging agent: 68Ga-labeled c(RGDyK)-isothiocyanatobenzyl-1,4,7-triazacyclononane-1,4,7-triacetic acid and feasibility studies in mice. (1/394)

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(S)-5-(p-nitrobenzyl)-PCTA, a promising bifunctional ligand with advantageous metal ion complexation kinetics. (2/394)

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Intermolecular hydroamination of ethylene and 1-alkenes with cyclic ureas catalyzed by achiral and chiral gold(I) complexes. (3/394)

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Selective binding, self-assembly and nanopatterning of the Creutz-Taube ion on surfaces. (4/394)

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Intermediates in reactions of copper(I) complexes with N-oxides: from the formation of stable adducts to oxo transfer. (5/394)

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Spontaneous resolution of racemic camphorates in the formation of three-dimensional metal-organic frameworks. (6/394)

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Demetalation of silver(III) corrolates. (7/394)

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Current applications and future potential for bioinorganic chemistry in the development of anticancer drugs. (8/394)

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Coordination Chemistry - Twenty One by fra International Conference on Coordination Chemistry 1980 Toulouse; 2 editions; First published in 1981
Coordination complexes are so pervasive that their structures and reactions are described in many ways, sometimes confusingly. The atom within a ligand that is bonded to the central metal atom or ion is called the donor atom. In a typical complex, a metal ion is bonded to several donor atoms, which can be the same or different. A polydentate (multiple bonded) ligand is a molecule or ion that bonds to the central atom through several of the ligands atoms; ligands with 2, 3, 4 or even 6 bonds to the central atom are common. These complexes are called chelate complexes; the formation of such complexes is called chelation, complexation, and coordination. The central atom or ion, together with all ligands, comprise the coordination sphere.[5][6] The central atoms or ion and the donor atoms comprise the first coordination sphere. Coordination refers to the "coordinate covalent bonds" (dipolar bonds) between the ligands and the central atom. Originally, a complex implied a reversible association of ...
This thesis describes the synthesis and characterisation of novel complexes bearing monoanionic phenolateamine ligands and explores their catalytic behaviour in the ring opening polymerisation of lactide and in the polymerisation of ethylene. Chapter 1 introduces and reviews various aspects of the coordination chemistry of phenolateamine ligands and is followed by an introduction to the field of lactide polymerisation. Chapter 2 describes the preparation of several potentially tetradentate proligands via the Mannich reaction. The ligands presented have various combinations of donors, chain length and substituents on the phenyl backbone. The synthesis and characterisation of several novel main group complexes (K, Ca and Al) using these ligands is presented. The calcium bis-chelate complexes are shown to be highly active in the ring opening polymerisation of lactide. Chapter 3 introduces a new family of zinc species stabilised by these ligands. The coordination chemistry of zinc alkyls and ...
Meder, Markus B. and Gade, Lutz H. (2004), Coordination Chemistry of 1,3-Bis(2-pyridylimino)- and 1,3-Bis(2-thiazolylimino)soindole Copper Complexes: Investigation of Their Catalytic Behavior in Oxidation Reactions. Eur. J. Inorg. Chem., 2004: 2716-2722. doi: 10.1002/ejic.200400012 ...
In coordination chemistry, a structure is first described by its coordination number, the number of ligands attached to the metal (more specifically, the number of donor atoms). Usually one can count the ligands attached, but sometimes even the counting can become ambiguous. Coordination numbers are normally between two and nine, but large numbers of ligands are not uncommon for the lanthanides and actinides. The number of bonds depends on the size, charge, and electron configuration of the metal ion and the ligands. Metal ions may have more than one coordination number. Typically the chemistry of transition metal complexes is dominated by interactions between s and p molecular orbitals of the donor-atoms in the ligands and the d orbitals of the metal ions. The s, p, and d orbitals of the metal can accommodate 18 electrons (see 18-Electron rule). The maximum coordination number for a certain metal is thus related to the electronic configuration of the metal ion (to be more specific, the number ...
In coordination chemistry, a structure is first described by its coordination number, the number of ligands attached to the metal (more specifically, the number of donor atoms). Usually one can count the ligands attached, but sometimes even the counting can become ambiguous. Coordination numbers are normally between two and nine, but large numbers of ligands are not uncommon for the lanthanides and actinides. The number of bonds depends on the size, charge, and electron configuration of the metal ion and the ligands. Metal ions may have more than one coordination number. Typically the chemistry of transition metal complexes is dominated by interactions between s and p molecular orbitals of the donor-atoms in the ligands and the d orbitals of the metal ions. The s, p, and d orbitals of the metal can accommodate 18 electrons (see 18-Electron rule). The maximum coordination number for a certain metal is thus related to the electronic configuration of the metal ion (to be more specific, the number ...
Coordination chemistry, as we know it today, has been shaped by major figures from the past, one of whom was Joseph Chatt. Beginning with a description of Chatts career presented by co-workers, contemporaries and students, this fascinating book then goes on to show how many of todays leading practitioners in the field, working in such diverse areas as phosphines, hydrogen complexes, transition metal complexes and nitrogen fixation, have been influenced by Chatt. The reader is then brought right up-to-date with the inclusion of some of the latest research on these topics, all of which serves to underline Chatts continuing legacy. Intended as a permanent record of Chatts life, work and influence, this book will be of interest to lecturers, graduate students, researchers and science historians.
Chiral N, N - and N,O-Bidentate Anionic Ligands. Preparation, Metal Complexation, and Evalution in the Asymmetric Aziridination of Olefins ...
The coordination chemistry of two selenourea ligands (SeIMes and SeIPr) towards silver(i) triflate and silver(i) nitrate was investigated. Two aggregation modes were observed in the solid state, strongly influenced by the size of the aromatic substituents on the ligand. With mesityl groups, selenium-bridged bimetal
Coordination Chemistry of Mercury(II) in Liquid and Aqueous Ammonia Solution and the Crystal Structure of Tetraamminemercury(II) Perchlorate ...
Here we report the syntheses and crystal structures of a series of cobalt(II) and nickel(II) complexes derived from RNP2 ligands (where R = OMeBz, HBz, BrBz, Ph) bearing ethylene linkers between a single N and two P donors. The CoII complexes generally adopt a tetrahedral configuration of general formula [(NP2)Co(I) 2], wherein the two phosphorus donors are bound to the metal center but the central N-donor remains unbound. We have found one case of structural isomerism within a single crystal structure. The CoII complex derived from BzNP2 displays dual coordination modes: one in the tetrahedral complex [(BzNP2)Co(I)2]; and the other in a square pyramidal variant, [(BzNP2)Co(I)2]. In contrast, the NiII complexes adopt a square planar geometry in which the P(Et)N(Et)P donors in the ligand backbone are coordinated to the metal center, resulting in cationic species of formula [(RNP2)Ni(I)]+ with iodide as counterion. All NiII complexes exhibit sharp 1H and 31P spectra in the diamagnetic region. The Co II
Structures and Isomers of Coordination Complexes - 3 lecturesReading: M & T* Chapter 9 Nomenclature Isomerism Coordination Numbers and Structures Symmetry Considerations
in Coordination Chemistry Reviews (2007), 251(5-6), 765-794. N-Heterocyclic carbenes are now commonly encountered in organometallic and inorganic coordination chemistry. The increasing attention they enjoy is due to their ability to act as ancillary ligands in a ... [more ▼]. N-Heterocyclic carbenes are now commonly encountered in organometallic and inorganic coordination chemistry. The increasing attention they enjoy is due to their ability to act as ancillary ligands in a growing number of transition metal catalysts or even to play the role of nucleophilic reagents and catalysts in diverse organic transformations. As a fine addition to the NHC-Ru-alkylidenes, popular for their tremendous success in metathesis chemistry, an array of robust and stable Ru-NHCs has proven their utility in non-metathetical reactions. The present review surveys different classes of Ru-NHCs and their applications as efficient catalysts (or precatalysts) in several types of fundamental organic processes e.g. ...
B01J31/1805-Catalysts comprising hydrides, coordination complexes or organic compounds containing coordination complexes containing nitrogen, phosphorus, arsenic or antimony as complexing atoms, e.g. in pyridine ligands, or in resonance therewith, e.g. in isocyanide ligands C=N-R or as complexed central atoms the ligands containing nitrogen ...
Inorganic oxides possess a remarkable diversity of chemical composition and architecture, giving rise to a vast domain of solid state properties with applications ranging from heavy construction to molecular electronics. Despite such inherent fundamental and practical significance, their structural design, in the sense of controlled synthesis of metastable but persistent extended structures, remains a challenge in solid state chemistry. It is also noteworthy that, while some naturally occurring oxide minerals possess complex crystal structures, the majority are of simple composition and have highly symmetrical structures with rather small unit cells. Although such simple oxides can possess unique and specific properties, such as piezoelectricity, ferromagnetism or catalytic activity, as a general rule there is a correlation between the complexity of the structure of a material and its functionality. However, the occurrence of complex inorganic oxides in the geosphere and the biosphere suggests ...
Sigma-Aldrich offers abstracts and full-text articles by [Malachy McCann, John McGinley, Kaijie Ni, Mark OConnor, Kevin Kavanagh, Vickie McKee, John Colleran, Michael Devereux, Nicholas Gathergood, Niall Barron, Andreea Prisecaru, Andrew Kellett].
Metal Organic Frameworks (commonly called MOFs) are intricate crystal structures that can store or separate individual elements in a highly efficient manner. MOFs are materials made by linking inorganic and organic units together with strong bonds formed through coordination chemistry. MOFs are not only leading the way in providing clean technology solutions, but are actively being explored by the energy, transportation, and pharmaceutical industries to deliver new applications (for energy storage).. !ADVERTISEMENT!. Since the technology was introduced, scientists have found applications for gas separation and storage as well as other promising applications within the green industry. framergyâ„¢ is a company on the cutting edge of this industry. Their new class of MOFs has been built from the nano-level to more closely mimic nature thereby leveraging the attributes of MOFs to increase working capacity and stability.. Because MOFs have the highest surface area known to man, extreme amounts of ...
The results and findings of the research work being presented in this thesis are based on the following aspects of inorganic and coordination chemistry of vanadium(V), molybdenum(VI), copper(I), manganese(III) and iron(III ...
Coordination chemistry (Topics in modern chemistry) by Quagliano, James V and a great selection of similar Used, New and Collectible Books available now at AbeBooks.com.
I did my MS thesis under the direction of James W. Patterson. My thesis was in the area of metal complexation in activated sludge. My doctoral thesis was done under the direction of the late Richard S. Engelbrecht. It concerned the mechanism of action of chlorine as a disinfectant against yeast, acid-fast (Mycobacteria) bacteria and coliform organisms.. Return to Main Home Page ...
free ebooks preparation characterisation and reactivity of low oxidation state d block metal complexes stabilised by extremely bulky amide ligands.html document available with no premium account to get it
Læs om Transient Changes in Molecular Geometries and How to Model Them : Simulating Chemical Reactions of Metal Complexes in Solution to Explore Dynamics, So. Bogens ISBN er 9783319386836, køb den her
Bücher bei Weltbild.de: Jetzt Studies of group 13 metal complexes bearing nacnac-mimetic bisheterocyclo methanides and amides von David-Raphael Dauer versandkostenfrei bestellen bei Weltbild.de, Ihrem Bücher-Spezialisten!
The T-total of this new T-shape is 31 + 23 + 15 + 14 + 16 = 99. Let us see if the formula works.. y = 5(T + a - 8b) - 56 y = 5[59 + 4 - 8(4)] - 56. y = 99. After investigating the two formulae for new translated T-total for a 9 by 9 grid and an 8 by 8 grid, a general formula for new translated T-total for any grid of different sizes can be worked out:. Let G be the width of the grid.. y = 5(T + a - G b) - 7G. This general formula is basically based on the formula for T-total on any grid of any width worked out previously, and further developed by adding the vectors of the translation. ...
Compositions for the treatment of pain and/or inflammation comprising at least one peptide with the general formula (I) R1-AA-R2, its stereoisomers, mixtures thereof, and its cosmetically and pharmaceutically acceptable salts. Peptide with general formula (I), its stereoisomers, mixtures thereof, and its cosmetically and pharmaceutically acceptable salts for the treatment of pain and/or inflammation.
The omnipresent monoanionic nacnac ligand enables the stabilisation of main group elements in low oxidation states and is used as supporting ligand in several...
Lukevics E.; Ignatovich L. 32Ge Biological Activity of Organogermanium Compounds. Metallotherapeutic Drugs and Metal-Based Diagnostic Agents. The Use of Metals in Medicine. Ed. M.Gielen, E.R.T.Tiekink. J.Wiley & Sons, Ltd. 2005(15), 279-295 ...
Proposed are compositions comprising • one or more alkyl lactate sulfates (A) of general formula (I) in which the R1 group is a linear or branched alkyl or alkenyl group having 6 to 30 carbon atoms, the index n is a number in the range ...
I have derived a formula for the generating function as 2/3x 3 / 1-1/3x 3 and am asked to manipulate this so that it follows the general formula for a
Avhandlingar om COORDINATION MECHANISMS. Sök bland 78317 avhandlingar från svenska högskolor och universitet på Avhandlingar.se.
Many thiol-containing molecules show heavy metal complexation ability and are used as antidotes. In this study, the potential function associated with thiol-containing peptides (TCPs) from soy protein hydrolysates as natural detoxicants for heavy metals is reported. TCPs enriched by Thiopropyl-Sepharose 6B covalent chromatography had different molecular weight distributions as well as different numbers of proton dissociable groups, depending on the proteases and degree of hydrolysis. The major contribution of sulfhydryl groups was confirmed by the largest pH decrease between 8.0 and 8.5 of the pH titration curves. The complexation of TCPs with heavy metals was evaluated by stability constants (βn) of TCP-metal complexes whose stoichiometry was found to be 1:1 (ML) and 1:2 (ML2). TCPs from degree of hydrolysis of 25% hydrolysates gave high affinities towards Hg2+, Cd2+, and Pb2+ (giving similar or even bigger lgβ values than that of glutathione). A significantly positive correlation was found between
This book describes the coordination chemistry of macrocyclic ligands. Common types of ligands are introduced and strategies for the synthesis of the free ligands and their metal complexes are discussed. The unique thermodynamic and kinetic properties of macrocyclic complexes are introduced and applications of the ligands presented.
Full Paper Received: 22 December 2010 Revised: 27 March 2011 Accepted: 11 April 2011 Published online in Wiley Online Library: 18 May 2011 (wileyonlinelibrary.com) DOI 10.1002/aoc.1807 Sulfonamide-derived compounds and their transition metal complexes: synthesis, biological evaluation and X-ray structure of 4-bromo-2-[(E)-{4-[(3,4-dimethylisoxazol-5 yl)sulfamoyl]phenyl} iminiomethyl] phenolate Zahid H. Chohan∗ and Hazoor A. Shad Sulfonamide-derived new ligands, 4-({[(E)-(5-bromo-2-hydroxyphenyl)methylidene]-amino}methyl)benzenesulfonamide and 4-bromo-2-((E)-{4-[(3,4-dimethylisoxazol-5-yl)sulfamoyl]phenyl}iminiomethyl)phenolate and their transition metal [cobalt(II), copper(II), nickel(II) and zinc(II)] complexes were synthesized and characterized. The nature of bonding and structure of all the synthesized compounds were deduced from physical (magnetic susceptibility and conductivity measurements), spectral (IR, 1 H and 13 C NMR, electronic, mass spectrometry) and analytical (CHN analysis) ...
Schubert, U. S., Winter, A. and Newkome, G. R. (2011) Catalytic Applications of Terpyridines and Their Transition Metal Complexes, in Terpyridine-Based Materials: For Catalytic, Optoelectronic and Life Science Applications, Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim, Germany. doi: 10.1002/9783527639625.ch9 ...
I cant figure out how to determine the electron count for these rhodium complexes. Starting with the one at the top. Heres how I count its electrons: rhodium is a group 9 element so it has 2s electrons and 7d electrons which means it has 9 out of 18 valence electrons to begin with. The 2 CO ligands add an extra 4 electrons, bringing the total to 13. Im a bit confused about how the iodide ligands work, do they also donate 2 electrons each? If so, that brings the electron count to 17. The ion has a charge of -1, bringing the total electron count to 18. How can this be a coordinatively unsaturated complex? If you add 2 more ligands to it then you end up with an electron count of 22 ...
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Since the discovery of cisplatin about 40 years ago, the design of innovative metal-based anticancer drugs is a growing area of research. Metal elements offer specific characteristics due to their intrinsic properties and could be used in relation to their final state: a metal complex, a radionuclide, a metal-based nanoparticle product. Transition metal coordination complexes interact with cell molecular targets, affecting biochemical functions resulting in cancer cell destruction. Radionuclides are another way to use metals as anticancer therapy. The metal nucleus of the unstable radionuclide becomes stable by emitting energy. The biological effect in different tissues is obtained by the absorption of this energy from the radiation emitted by the radionuclide, the principal target generally agreed for ionizing radiations being DNA. A new area of clinical research is now emerging using the same experimental metal elements, but in a radically different manner: metals and metal oxides used as ...
wherein, X1 is defined as in General Formula I RA and RH1 are defined as in General Formula VIII, RS is defined as in General Formula I, RH is defined as in General Formula I, RE is defined as in General Formula II, RB and RS1 are defined as in General Formula X, RP is as defined in General Formula V, and RL is as defined in General Formula I, or X1 is selected from the group consisting of hydroxy, alkenyloxy, alkoxy, aryloxy, benzyloxy, substituted benzyloxy; thioalkyl, thioaryl, halogen, imidoyl, phosphate and related phosphate ester type leaving groups, a tbutyldiphenylsilyloxy or other such substituted silyloxy protecting group; a lipoaminoacid or other such group suitable for conjugation to delivery systems or solid supports; and the stereochemistry may be alpha or beta, RH is selected from the group consisting of benzyl or substituted benzyl protecting group, allyl, and allyloxycarbonyl; RH1 is selected from the group consisting of benzyl or substituted benzyl protecting group, allyl, ...
DNA has a strong affinity for many heterocyclic aromatic dyes, such as acridine and its derivatives. Lerman in 1961 first proposed intercalation as the source of this affinity, and this mode of DNA binding has since attracted considerable research scrutiny. Organic intercalators can inhibit nucleic acid synthesis in vivo, and they are now common anticancer drugs in clinical therapy.. The covalent attachment of organic intercalators to transition metal coordination complexes, yielding metallointercalators, can lead to novel DNA interactions that influence biological activity. Metal complexes with σ-bonded aromatic side arms can act as dual-function complexes: they bind to DNA both by metal coordination and through intercalation of the attached aromatic ligand. These aromatic side arms introduce new modes of DNA binding, involving mutual interactions of functional groups held in close proximity. The biological activity of both cis- and trans-diamine PtII complexes is dramatically enhanced by the ...
Koshy, J.; Ansary, A.; Lo, K.M.; Das, V.G. (2001) Evaluation of antibacterial properties of triorganotin carboxylates containing functionalised ester groups in tests against some pathogenic bacteria. Metal-based drugs, 8 (2). pp. 107-11. ISSN 0793-0291. Koshy, J.; Das, V.G.; Balabaskaran, S.; Ng, S.W.; Wahab, N. (2000) High In-Vitro Antitumour Activity of Triphenyltin Coumarin 3-Carboxylate and its Coordination Complexes With Monodentate Oxygen Donor Ligands Against the Epstein Barr Virus (EBV)-DNA Positive Raji and the P-388 Murine Leukaemia Cell Lines, and Evidence for the Suppression by Organotin of the Early Antigen Complex in the EBV Lytic Cycle. Metal-based drugs, 7 (5). pp. 245-51. ISSN 0793-0291. ...
A well-defined amphiphilic core-shell polymer functionalized with bis(p-methoxy-phenylphosphino)phenylphosphine (BMOPPP) in the nanogel (NG) core has been obtained by a convergent RAFT polymerization in emulsion. This [email protected] and the previously-reported [email protected] (TPP = triphenylphosphine) and core cross-linked micelles ([email protected]; L = TPP, BMOPPP) having a slightly different architecture were loaded with [Rh(acac)(CO)2] or [RhCl(COD)]2 to yield [Rh(acac)(CO)([email protected])] or [RhCl(COD)([email protected])] (Pol = CCM, NG). The interparticle metal migration from [Rh(acac)(CO)([email protected])] to [email protected] is fast at natural pH and much slower at high pH, the rate not depending significantly on the polymer architecture (CCM vs. NG). The cross-exchange using [Rh(acac)(CO)([email protected])] and [RhCl(COD)([email protected])] (Pol = CCM or NG) as reagents at natural pH is also rapid (ca. 1 h), although slower than the equivalent homogeneous reaction on the molecular species (<5 min). On the other hand, the subsequent rearrangement of [Rh(acac)(CO)(TPP
Hcabo] with different carboxylato coordination modes are reported. Although the carboxylato group has different coordination modes, the same carboxylate ligand binding to copper ion via four coordinating modes is rare. The crystal structure of complex [Cu2(Cabo)4(dmf)2]·2dmf (1) consists of a symmetrical dimeric Cu(II) carboxylato paddle-wheel core and oxygen atoms from dmf at the apical positions. The dinuclear complex [Cu2(Cabo)3(phen)2]ClO4·H2O·C2H5OH (2) ( ...
Principal Investigator:小澤 文幸, Project Period (FY):2012-06-28 - 2017-03-31, Research Category:Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area), Project Area:Stimuli-responsive Chemical Species for the Creation of Functional Molecules
مرحبا بكم في شبكة جامعة بابل الالكترونية لتحميل المحاضرات والبحوث الاكاديمية في موقع الكلية او الاطلاع على لوحة اعلانات الطلاب ونتائج الامتحانات اتبع الروابط في الصفحة الرئيسية لموقع الكلية ضمن شبكة جامعة بابل
This project focuses on the design and synthesis of coordination complexes as models for the artificial nucleases, superoxide dismutases and molybdenum/iron-related enzymes. The research includes (1) design and construction of a series of Ru(II)-polypyridyl complexes and explore their properties of DNA binding and cleavage, as well as their selectivity and efficiency of DNA recognition. The structures of these complexes will be systematically tuned by varying the shapes of the intercalative ligands, which will enable us to study the mechanism for the interactions between the complexes and DNA. This research will lay foundation for the development of new DNA molecular probes and therapeutic reagents. (2) Based on the structures of the active centers of some metal enzymes, several metal complexes with cyclodextrin or biologically related ligands will be prepare as model compounds for metalloenzymes such as metallohydrolase and superoxide dismutase. Their structures will be fully studied and their ...
This thesis, entitled "Anion Templated Self-Assembly - From Anion Complexes to the Formation of Supramolecular 2D Networks" covers the anion complexation and ATSA abilities of different sets of ligands. The work will be divided into five chapters, gathering the work on each different sets of ligands separately. Chapter 1 will introduce the most recent advances in anion complexation and aniontemplated self-assembly, from the formation of 1:1 (Ligand:Anion) complexes to the formation of higher order bundles. Particular focus will be given to the use hydrogen bonding as the main interaction for the formation of anion-templated self-assemblies. Chapter 2, will discuss the synthesis and anion binding studies of tripodal tris(urea) ligands with Cl - , CH 3 COO - , H 2 PO 4 - and SO 4 2- . The anion binding studies carried out in solution on these ligands indicated that ATSA was occurring which lead us to investigate also the self-assembly behaviour in solution and in the solid state, wh... ...
Synthesis, Characterization, Ab initio Calculations, Thermal, Thermodynamic and Antioxidant Properties of Some Oxovanadium(IV) Complexes Containing O,O- , N,N- and N,O- Donor Sphere and Synthesis, Characterization and Thermodynamics of Some New Unsymmetrical Co(III) Schiff Base Complexes Derived from ۲,۳- and ۳,۴- ...
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Kaifeng Niu, (Visiting Student, Soochow University). Dr Linda A. Zotti (Research Fellow, now at the Universidad Autónoma de Madrid). Anne Marie Delaney (UG 2015, angular momentum and virial theorems). Thomas Wyse Jackson (UG 2015, DFT+U+J calculations). Fiona McCarthy (UG 2015, DFT+U for coordination complexes). Mark McGrath (UG 2015, geometry optimisation using DFT+U). Eamonn OShea (UG 2014, electric circular dichroism). Cillian Dickson (UG 2014, cutoff Coulomb method). Liam Hallinan (UG 2014, the GW approach). Edgar Engel (UG 2012, colour centres in diamond). ...
Disclosed are compositions comprising 1) taxol, taxotere, or derivatives thereof and 2) a platinum coordination complex such as cisplatin, the compositions exhibiting therapeutic synergy.
Asid glikolik lebih kuat sedikit berbanding asid asetik kerana kuasa tarikan elektron daripada kumpulan hidroksil terminalnya. Kumpulan karboksilatnya pula boleh berpadanan dengan ion logam untuk menghasilkan kompleks pengkoordinat (coordination complexes), terutamanya dengan ion-ion Pb2+ dan Cu2+ yang lebih kuat berbanding asid-asid karboksilik lain. Hal ini menunjukkan penglibatan kumpulan hidroksil dalam pembentukan kompleks sebegini barangkalinya dengan kehilangan ion dalam kumpulan tersebut.[4] ...
The macrobicyclic mixed-donor N3S3 cage ligand AMME-N(3)S(3)sar (1-methyl-8-amino-3,13,16-trithia-6,10,19-triazabicyclo[6.6.6]eicosane) can form complexes with Cu(II) in which it acts as hexadentate (N3S3) or tetradentate (N2S2) donor. These two complexes are in equilibrium that is strongly influenced by the presence of halide ions (Br- and Cl-) and the nature of the solvent (DMSO, MeCN, and H2O). In the absence of halides the hexadentate coordination mode of the ligand is preferred and the encapsulated complex (Cu-in(2+)) is formed. Addition of halide ions in organic solvents (DMSO or MeCN) leads to the tetradentate complex (Cu-out(+)) in a polyphasic kinetic process, but no Cu-out(+) complex is formed when the reaction is performed in water. Here we applied density functional theory calculations to study the mechanism of this interconversion as well as to understand the changes in the reactivity associated with the presence of water. Calculations were performed at the B3LYP/(SDD,6-31G**) ...
The present invention relates to a process for the preparation of γ-lactams of the general formula I The invention relates also to novel advantageous intermediates of the general formulae V, IV and II and their salts and their use. The compounds of the general formula I are obtained by cyclising compounds of the general formula II which can be prepared from the intermediate compounds V.
(KudoZ) English to French translation of choroidal filling: retard de perfusion choroïdien ou retard au remplissage choroïdien [Medical: Health Care (Medical)].
Life on earth essentially depends on the functioning of biological macromolecules such as proteins. At least 50 % of all known enzymes contain metal atoms as key constituents of their active sites, which are crucially for the reactivity. These metal centers often are chemically complex and involved in electron and proton transfer processes, substrate turnover, and regulation. A particular important aspect in biophysics research is the activation of small molecules at protein-bound metal centers with outstanding relevance in chemistry, medicine, industry, and energy applications. The field is still under rapid development. The lecture is addressed to advanced students with interests in biophysics. Covered topics include, e.g., coordination chemistry, assembly, molecular and electronic structure, photoreactions, redox processes, catalysis, and dynamics of metal centers in, for example, hydrogenase, photosystem, oxidase proteins. Selected experimental and theoretical approaches to understand the ...
CHEMICAL COMPOUNDS Polymeric Transition Metal Complexes THERASENSE INC U.S. Patent 6,605,200 A novel polymeric metal complex with Os, Ru, Fe, etc., has a polymeric backbone; a plurality of spacers, each being covalently coupled to and extending from the polymeric backbone and including a non-cyclic functional group;
In coordination chemistry and catalysis hemilability (hemi - half, lability - a susceptibility to change) refers to a property of many polydentate ligands which contain at least two electronically different coordinating groups, such as hard and soft donors. These hybrid or heteroditopic ligands form complexes where one coordinating group is easily displaced from the metal centre while the other group remains firmly bound; a behaviour which has been found to increase the reactivity of catalysts when compared to the use of more traditional ligands. In general, catalytic cycles can be divided into 3 stages: Coordination of the starting material(s) Catalytic transformation of the starting material(s) to the product(s) Displacement of the product(s) to regain the catalyst (or pre-catalyst) Traditionally the focus of catalytic research has been on the reaction taking place in the second stage, however there will be energy changes associated with the beginning and end steps due to their effect on the ...
Research in the Franz group is involved in elucidating the structural and functional consequences of metal ion coordination in biological systems. We are particularly interested in understanding the coordination chemistry utilized by biology to manage essential yet toxic species like copper and iron. Understanding these principles further guides our development of new chemical tools to manipulate biological metal ion location, speciation, and reactivity for potential therapeutic benefit. We use a combination of synthesis, spectroscopy, and biochemistry in our work. Please visit our group website to learn more about our research.. ...
Research in the Franz group is involved in elucidating the structural and functional consequences of metal ion coordination in biological systems. We are particularly interested in understanding the coordination chemistry utilized by biology to manage essential yet toxic species like copper and iron. Understanding these principles further guides our development of new chemical tools to manipulate biological metal ion location, speciation, and reactivity for potential therapeutic benefit. We use a combination of synthesis, spectroscopy, and biochemistry in our work. Please visit our group website to learn more about our research.. ...
All years: modules include: Chemical reactivity; atomic structure; introduction to spectroscopy and characterisation; mathematics for chemistry 1; aromatic chemistry; chemical equilibria; molecular structure; periodicity; coordination chemistry; stereochemistry; alkanes, alkenes, alkynes; haloalkanes, alcohols, amines; chemistry of carbonyls and carboxyls; chemical kinetics; states of matter; quantum chemistry 1.. ...
This continuation of CHM121 emphasizes solution equilibrium chemistry, including gases, precipitation, acid/base, coordination chemistry and oxidation-reduction, culminating with the Nernst equation. It also includes thermodynamics and kinetics.. Recommended Prereq: C or better in MTH070 or MTH072 or placement by math assessment; high school chemistry. Prereq: CHM121.. ...
The Scott group conducts both fundamental and applied research in reactions, surface chemistry, and catalysis. Our goal is to understand the interactions and transformations of molecules at gas-solid and liquid-solid interfaces by creating highly uniform active sites. We use advanced techniques in organometallic and coordination chemistry, surface science, high resolution
Liepiņš E.; Birģele I.; Lukevics E.; Bogoradovsky E.T.; Cherkasov N.N.; Zavgorodny V.S. 13/12C isotope shifts in 119Sn NMR spectra of methylethynylstannanes . Abstr., VII-th Intern. conf. on the organometallic and coordination chemistry of germanium, tin and lead; Sept. 20-25; E.Lukevics (ed.-in-chief) et al., Eds.; : Riga, Inst. of Organic Synthesis, Latvian Acad. Sci., 1992; 87 ...
Page contains details about bis(dipyrrinato)zinc(II) metal complex nanosheet . It has composition images, properties, Characterization methods, synthesis, applications and reference articles : nano.nature.com
Electroluminescent assembly comprising a substrate, an anode, an electroluminescent element and a cathode, where at least one of the two electrodes is transparent in the visible spectral region and the electroluminescent element comprises one or more zones selected from the group consisting of a hole injection zone, a hole transport zone, an electroluminescent zone, an electron transport zone and an electron injection zone in the specified order, where each of the zones present may also assume functions of the other zones mentioned, wherein the electroluminescent element contains a multinuclear metal complex.
The fundamental structure, bonding and reactivity of late transition metal complexes. Transition metal catalysis and small molecule activation. The use of supramolecular ligand architectures in catalysis and for studying unstable organometallic species. Alkane activation. [more details ...
CCEA A2 CHEMISTRY [NEW] A2 Chemistry - transition metal complexes (Office 2007) (version 1 - 2013-05-01) CCEA AS CHEMISTRY AS Chemistry - cation identification guide (Office 2003) (updated 2011 05 15) AS Chemistry - cation identification guide (Office 2007) (updated 2011 05 15) By the way, I did say I might do another powerpoint for…
As a researcher in Uppsala has shown, another advantage of cellulose-based batteries is that they can be quickly recharged. Their one disadvantage is that they are less able to retain their energy compared to conventional metal-based batteries. The technology needs to be developed further to be a real alternative. In the coming years, Sony plans to develop its bio-based batteries for commercial usage. But the application will initially be limited to toys and other products that have limited energy needs. Looking down the road, Sony hopes its bio-batteries could be used in laptops and cell phones, for example.. Hopefully batteries based on cellulose and other biological materials will become real alternatives to todays metal-based batteries.. This article was published in July 2012. ...
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The substitution kinetics of the complexes: [Pt(terpy)Cl]Cl?2H2O (PtL1), [Pt(tBu3terpy)Cl]ClO4 (PtL2), [Pt{4?-(2???-CH3-Ph)terpy}Cl]BF4 (PtL3), [Pt{4?-(2???-CF3-Ph)terpy}Cl]CF3SO4 (PtL4), [Pt{4?-(2???-CF3-Ph)-6-Ph-bipy}Cl ...
NaLiLa2Ti4O12 is Orthorhombic Perovskite-derived structured and crystallizes in the triclinic P1 space group. The structure is three-dimensional. Na1+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Na-O bond distances ranging from 2.36-3.01 Å. Li1+ is bonded in a 5-coordinate geometry to five O2- atoms. There are a spread of Li-O bond distances ranging from 2.07-2.57 Å. There are two inequivalent La3+ sites. In the first La3+ site, La3+ is bonded in a 12-coordinate geometry to nine O2- atoms. There are a spread of La-O bond distances ranging from 2.41-2.86 Å. In the second La3+ site, La3+ is bonded in a 12-coordinate geometry to twelve O2- atoms. There are a spread of La-O bond distances ranging from 2.46-3.10 Å. There are four inequivalent Ti4+ sites. In the first Ti4+ site, Ti4+ is bonded to six O2- atoms to form distorted corner-sharing TiO6 octahedra. The corner-sharing octahedra tilt angles range from 2-26°. There are a spread of Ti-O bond distances
Sm3BSi2O10 crystallizes in the orthorhombic Pbca space group. The structure is three-dimensional. there are three inequivalent Sm3+ sites. In the first Sm3+ site, Sm3+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Sm-O bond distances ranging from 2.32-2.62 Å. In the second Sm3+ site, Sm3+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Sm-O bond distances ranging from 2.32-2.61 Å. In the third Sm3+ site, Sm3+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of Sm-O bond distances ranging from 2.33-2.72 Å. B3+ is bonded in a trigonal planar geometry to three O2- atoms. There are a spread of B-O bond distances ranging from 1.35-1.43 Å. There are two inequivalent Si4+ sites. In the first Si4+ site, Si4+ is bonded in a tetrahedral geometry to four O2- atoms. There are a spread of Si-O bond distances ranging from 1.63-1.66 Å. In the second Si4+ site, Si4+ is bonded in a tetrahedral geometry to four O2-
To provide a compound represented by General Formula (1) below, ##STR00001## where R denotes a C1-C10 hydrocarbon group, Z denotes any one of a sulfide group, a sulfinyl group and a sulfonyl group, a
The anions (A) form hexagonal closest packing and atoms (C) occupy only 2/3 of octahedral voids in it, then the general formula of the compound is ...
Richard Keene and colleagues report an inert dinuclear polypyridylruthenium(II) groove binding metal complex that exhibits slow exchange DNA binding in this HOT article. Such compounds have potential as anti-microbial agents as they can block the interaction of important proteins with DNA.. For more details, download the article which is free to access for 4 weeks ...
Mes chers collègues étrangers,. Ayant eu le concept expliqué par mon cher ami et collègue comédien le Directeur Général BBC, le sujet Neat-O pour cette semaine est «Crème Brûlée».. Ce sera un honneur pour moi juger vos importations évaluées le lundi suivant.. Les règles restent comme toujours, sauf quils seront soumis à linterprétation par la loi napoléonienne.. Avec toutes les bonnes volontés,. M. et Mme Cholet ...
6,90 €) Sūtījums uz mājām ar Venipak.. Pasūti preces uz mājām vai darba vietu. Piegāde notiek piecas dienas nedēļā (Pirm.-Piekt.). Uz Latviju preces nonāk pasūtījuma veikšanai nākamajā dienā. ...
Cenas uz 2018-02-22. Bezmaksas piegāde Rīgas rajonā jau nākamaja dienā, pārējas Latvijas pilsētās 5 darba dienu laikā. ...
Cenas uz 2018-02-22. Bezmaksas piegāde Rīgas rajonā jau nākamaja dienā, pārējas Latvijas pilsētās 5 darba dienu laikā. ...
A series of early transition metal complexes stabilized by aminopyridinato ligands have been synthesized. Many of these complexes have been studied in terms of their structure and have been evaluated in terms of applications in catalysis. The overall evaluation tells about the importance of electrophilicity of the metal centre, the steric bulk of the applied ligands, and the route of syntheses. Trialkyltantalum complexes were synthesized by salt elimination or toluene elimination by reacting the corresponding lithiated ligand with trialkyltantalum dichloride or the corresponding ligand with pentabenzyltantalum, respectively. These trialkyltantalum complexes are unusually thermally stable towards alpha-H elimination and form rather unstable organocations. Bis(aminopyridinato) complexes of zirconium were prepared using salt elimination route. The steric bulk of the ligands prevented the redistribution to tris- or tetrakis(aminopyridinato) zirconium complexes. These zirconium complexes are ...
Synthesis and Characterization of Bioactive Acylpyrazolone Sulfanilamides and Their Transition Metal Complexes: Single Crystal Structure of 4-Benzoyl-3-methyl-1-phenyl-2-pyrazolin-5-one Sulfanilamide. . Biblioteca virtual para leer y descargar libros, documentos, trabajos y tesis universitarias en PDF. Material universiario, documentación y tareas realizadas por universitarios en nuestra biblioteca. Para descargar gratis y para leer online.
Complexes [MeHgL]N03 {L = diphenyl(2-pyridy1)methane (pyCHPh2), bis(2-pyridy1)phenylmethane [(py)2CHPh], and the tripod ligands tris(2-pyridy1)carbinol [(py)3COH] and bis(2-pyridyl)(N-methyl-2-imidazolyl)carbinol [(py)2(NMeIm)COH]} are obtained from addition reactions in acetone. The ligand (py)2CHPh is formed on reaction of (2-benzylpyridy1)lithium with 2-bromopyridine. 1H NMR spectra indicate that (py)2CHPh and (py)2(N-Me1m)COH are present as bidentates in methanol solutions of their complexes, with the latter coordinated via the imidazolyl ring and one pyridyl ring. Spectra are consistent with the presence of weak pi interactions between mercury and phenyl rings in ...
Biomaterial-based regenerative approaches would allow for cost-effective off-the-shelf solution for the treatment of wounds. Hyaluronan (HA)-based hydrogel is one attractive biomaterial candidate because it is involved in natural healing processes, including inflammation, granulation, and reepi-thelialization. Herein, dynamic metal-ligand coordination bonds are used to fabricate moldable supramolecular HA hydrogels with self-healing properties. To achieve reversible crosslinking of HA chains, the biopolymer is modified with pendant bisphosphonate (BP) ligands using carbodiimide coupling and chemoselective "click" reactions. Hydrogel is formed immediately after simple addition of silver (Ag+) ions to the solution of HA containing BP groups (HA-BP). Compared with previous HA-based wound healing hydrogels, the HA-BP·Ag+ hydrogel is highly suitable for clinical use as it can fill irregularly shaped wound defects without the need for premolding. The HA-BP·Ag+ hydrogel shows antimicrobial ...
The principal idea of this volume is to offer a Capita Selecta of unconventional and thought-provoking topics in organometallic chemistry, presented by experts in each field. As intended, this approach leads either to reviews covering a specific uncommon class of organometallic compounds or to overviews which relate uncommon physical properties with various classes of organometallic compounds. The contributions are streamlined thus onto two main axes - unusual properties reflecting structures and bonding situations, on the one hand, and uncommon structural features or structure-reactivity relationships, on the other. Extensive cross-referencing of useful information is provided, making this volume accessible for people working in rather different areas of organometallic chemistry ...
Ligands derived from 8-quinoline, 6-quinoline, 1 -isoquinoline, and 5-isoquinoline were synthesized. These compounds have been used as ligands for complexation of transition metals, such as copper(II) and nickel(II). According to the spectrosocopic data, copper(II) cation forms (I: 1) and (I:2) complexes with 2-(8-quinoly1)-l,l,3,3- tetramethylguanidine and 2- (I -isoquinoly1)- 1,1,3,3-tetramethylguanidine, respectively. In contrast, 2-(6-quinoly1)- 1, l,3,3-tetramethylguanidine and 2-(5-isoquinoly1)- 1,1,3,3-tetramethylguanidine ligands were shown only in (1: 1) metal-ligand complex. When these ligands are reacted with nickel(II), the same results are obtained.
Texaphyrin metal complexes having improved functionalization including the addition of electron donating groups to positions 12, 15, 18 and/or 21 and/or the addition of electron withdrawing groups to positions 15 or 18 of the macrocycle. Electron donating groups at positions 12, 15, 18 and/or 21 contribute electrons to the aromatic .pi. system of the macrocycle which stabilizes the metal complex to demetallation and the imine bonds to hydrolysis, these texaphyrin metal complexes having enhanced stability are useful for localization, magnetic resonance imaging, radiosensitization, radiation therapy, fluorescence imaging, photodynamic tumor therapy and applications requiring singlet oxygen production for cytotoxicity. Electron withdrawing groups at positions 15 or 18 render the macrocycle more readily reduced, i.e. the redox potential is lower and the macrocycle more readily gains an electron to form a radical. Such texaphyrins having a low redox
0041] Generally, the present disclosure provides semiconductor devices including metal-based electrically programmable fuses and also provides methods for operating these fuses, thereby achieving superior reliability in generating a programmed state and preserving the state with a high degree of detectability over the lifetime of the semiconductor device. To this end, the electromigration effect in the fuse body of the metal fuses may be increased by providing, in addition to well-known electromigration causing mechanisms, such as providing a length that is greater than the corresponding Blech length, weakening specific interfaces, which may have been recognized as major diffusion paths for the current-induced metal diffusion, and the like, an additional very efficient mechanism in order to enable a reduction in overall size of the metal fuses, while, nevertheless providing superior reliability. In this respect, reliability may be understood as a reliable transition of the metal fuse from a low ...
After completing a post-doctoral appointment at the University of Illinois, Draganjac joined the faculty at A-State in 1985. As an Inorganic Chemist, he has been involved in the synthesis, structural characterization and reactivity of transition metal complexes containing sulfur-based ligands. These complexes serve as models for both industrial and biological catalytic systems. Emphasis is placed on the synthesis and structural characterization of transition metal complexes with thiophenic ligands in order to model the hydrodesulfurization (HDS) process, used industrially to remove sulfur contaminates from fossil fuel feed stocks. Studies on the thermally induced electron transfer between condensed phase materials are currently under investigation. He has over 40 publications and 100 presentations and has reviewed proposals for the National Science Foundation and the Petroleum Research Fund, as well as serving as a peer reviewer for the Journal of Chemical Crystallography, Organometallics, ...
Svavel är den mest förekommande föroreningen i råolja och finns närvarande i form av organiska tioler, sulfider, disulfider och tiofener. Vid förbränning av dessa bildas svaveloxider som kombinerat med vatten i atmosfären bidrar till surt regn. Dessutom har dessa föreningar en tendens att kontaminera ädelmetall-baserade katalysatorer som används för hydrokrackning i raffinaderier. Det är därför viktigt att avlägsna oönskat svavel vid omvandlingen av råolja till användbara kolväten. Hydrodesulfurization (HDS) är en katalytisk process som eliminerar oönskat svavel (och bildar H2S) från råolja genom behandling med vätgas vid höga temperaturer (~ 400 °C) och högt tryck. Under idealiska förhållanden bör denna process eliminera allt svavel utan att förstöra värdefulla kolväten. Denna process kräver därför en katalysator som gynnar avsvavling men hindrar nedbrytning av dessa viktiga kolväten. De kommersiella HDS-katalysatorerna består vanligtvis av en blandning ...
Philip J. Stephens was a theoretical chemist who brought to fruition two new forms of optical spectroscopy, using circularly polarized light, for the determination of electronic structure and molecular stereochemistry. The first was magnetic circular dichroism (MCD), the wavelength dependence of the differential absorption of left and right circularly polarized light induced by a magnetic field applied parallel to the light beam. Stephens established a methodology for extracting from MCD spectra the angular momentum characteristics of ground and excited electronic states and demonstrated applications to the assignment of the optical spectra of coordination complexes of transition metals and to metalloproteins. In the second half of his career Stephens led the field of vibrational circular dichroism (VCD), the measurement of the natural circular dichroism (CD) arising from the vibrational transitions of chiral molecules. He developed instrumental techniques to measure this weak dichroism over a ...
The implementation of photoinduced linkage isomerism in molecular-based optical materials represents a promising approach for the synthesis of high-contrast, high-resolution photosensitive materials that are necessary for high-density (holographic) data storage and/or real-three-dimensional (holographic) displays. The unsolved task of embedding a photofunctional coordination complex into a matrix like polymer polydimethylsiloxane (PDMS) with photoinduced isomerism of a SO-bond in the sulfoxide compound ...
The antineoplastic activity of α‐N‐heterocyclic thiosemicarbazones was discovered several decades ago. Currently the most promising drug candidate of this class of compounds is Triapine (3‐aminopyridine‐2‐carboxaldehyde thiosemicarbazone, 3‐AP), which entered several phase I and II clinical trials as an antitumor agent. We discovered that Triapine possesses intrinsic fluorescence properties. This enabled us to monitor for the first time the uptake and intracellular distribution of an α‐N‐heterocyclic thiosemicarbazone in living human cancer cells by fluorescence microscopy. In addition we synthesized the first zinc(II) complex [Zn(Triapine)Cl2]•HCl of Triapine, which shows fluorescence as well, compared its cytotoxicity in human cancer cells with that of the parental compound and studied the influence of metal complexation on intracellular distribution.. Triapine and its zinc complex were characterized spectroscopically. The UV‐Vis spectrum of Triapine in water shows a ...
An olefin polymer characterized by having (A) a density of from 0.850 to 0.940 g/cm3, (B) a melt flow rate (MFR) of from 0.1 to 200 g/10 minutes, and (C) a relation between the melt flow rate (MFR) and an intrinsic viscosity [η] measured in tetralin at 135 C. satisfying the range of the following equation (1): −4.04 log [η]+0.6≦log MFR≦−4.04 log [η]+0.96 (1) and its a film or sheet, and a method for producing an olefin polymer characterized by homopolymerizing an olefin or copolymerizing two or more olefins, with a catalyst for olefin polymerization, comprising: (A) a transition metal complex represented by the general formula [I] below; (B) at least one aluminum compound selected from (B1) to (B3); and/or (C) at least one boron compound selected from (C1) to (C3), at a temperature of at least 130 C. under a pressure of at least 300 kg/cm2G.
The present invention relates to carboxylic acid amides of general formula wherein R1 to R5, Ar, m and n are defined as in claim 1, the tautomers, stereoisomers, mixtures thereof, the prodrugs and the salts thereof which have valuable properties. The compounds of the above general formula I wherein R5 denotes a cyano group are valuable intermediate products for preparing the other compounds of general formula I, and the compounds of the above general formula I wherein R5 denotes one of the amidino groups mentioned in claim 1 have valuable pharmacological properties, particularly an antithrombotic activity and a factor Xa-inhibiting activity.
The coordination chemistry of Rh(III) porphyrin was outlined by Sadasivan and Fleischer in 1967.199,200 Their Rh(III) porphyrin, obtained by a metallation reaction using [Rh(CO)2Cl]2 and aerial oxidation, was believed to coordinate a labile water molecule which could be displaced by pyridine. A coordinated chloride counterion could be exchanged for azide, cyanide or hydroxide. Work by other groups has demonstrated that six coordinate Rh(III) porphyrins with two identical axial ligands may be generated by reaction of Rh(III)Cl porphyrins (OEP, TPP) with Ag+ to remove the chloride anion, followed by treatment with ligands such as BuNC, PPh2Me and POMe3.201,290 Reaction of Rh(III)Cl porphyrins with organolithium reagents232 or metal carbonylate anions202 afforded organometallic and metal-metal bonded derivatives respectively. The [(OEP)Rh]+ intermediate formed by treatment of (OEP)RhCl with AgBF4 was found to be active in electrophilic aromatic substitution reactions to afford s-bonded Rh aryl ...
Tristani, E. M.; Wirgau, J. I.; Dubay, G. R.; Sibert, J. W.; Crumbliss, A. L. "Siderophore-redox active ionophore host-guest assemblies: A prototype for selective metal ion compartmentalization," Inorg. Chim. Acta 2010, 363(13), 3611-3615.. Clare, J. P.; Statnikov, A.; Lynch, V.; Sargent, A. L.; Sibert, J. W. "Wurster-Type Ureas as Redox-Active Receptors for Anions," J. Org. Chem. 2009, 74, 6637-6646.. DeBacker, M.; Hureau, M.; Depriester, M.; Deletoille, A.; Sargent, A. L.; Forshee, P. B.; Sibert, J. W. "On the Oxidation of Wursters Reagent and the Wursters Crown Analog of 15-Crown-5 in the Presence of Alkali Metal Cations," J. Electroanal. Chem. 2008, 612, 97-104.. Sibert, J. W.; Forshee, P. B.; Hundt, G. R.; Sargent, A. L.; Bott, S. G.; Lynch, V. "Wursters Crowns: A Comparative Study of ortho- and para-Phenylenediamine-Containing Macrocyclic Receptors," Inorg. Chem. 2007, 46, 10913-10925.. Sibert, J. W.; Forshee, P. B.; Lynch, V. Electron Transfer vs. Coordination Chemistry: ...
Catherine E. Housecroft is Professor of Inorganic Chemistry at the University of Birmingham, UK, Executive Editor of Polyhedron, a former Associate Editor of Coordination Chemistry Reviews.Wulfsberg, Gary is the author of Inorganic Chemistry with ISBN 9781891389016 and ISBN 1891389017. [read more] ...
Since its structural realisation in 1985, C60 has garnered much attention in the chemical world for not only its spherical shape, but also its stability, electronic properties and the ability to do chemistry on its surface.. One such avenue that has proven popular in recent times is the incorporation of C60 into one-, two- and three-dimensional arrays, either covalently or non-covalently, in attempts to control the distribution of the molecules in the solid- or solution-phase. One problem that arises in the synthesis of these extended frameworks, however, is that there often a large amount of disorder and void space in the structure, so it can be difficult to ascertain with much degree of certainty how these C60 molecules are oriented. This uncertainty can consequentially result in the properties and behaviours of the new materials remaining unidentified.. Now, researchers from the University of California, Davis - Marilyn Olmstead and Alan Balch - have shown that coordination chemistry can be ...
Connect and collaborate with Rosario Mercedes Pérez Colodrero at University of Malaga, with research interests in Coordination Chemistry and Crystallization, on Mendeley.
Coordination complexes[edit]. The nitrite ion is known to form coordination complexes in at least five different ways.[1] ... When donation is from the nitrogen atom to a metal center, the complex is known as a nitro- complex. ... When donation is from one oxygen atom to a metal center, the complex is known as a nitrito- complex. ... The red isomer of pentaamminecobalt(III) with nitrite is now known to be a nitrito complex, [Co(NH3)5(ONO)]2+; it is metastable ...
Coordination complexes[edit]. In inorganic coordination complexes with octahedral or square planar geometries, there are also ... Cis and trans isomers occur both in organic molecules and in inorganic coordination complexes. Cis and trans descriptors are ... For octahedral complexes of formula MX4Y2, two isomers also exist. (Here M is a metal atom, and X and Y are two different types ... For more complex cases, the cis/trans designation is generally based on the longest carbon chain as reflected in the root name ...
Metal naphthenates are coordination complexes. They have the formula M(naphthenate)2 or are basic oxides with the formula M3O( ...
Some complexes have fivefold coordination. N[CH2CH2NMe2]3 (tris(N,N-dimethyl-2-aminoethyl)amine); P(o-C6H4SMe)3; P( ... Nickel forms many coordination complexes. Nickel tetracarbonyl was the first pure metal carbonyl produced, and is unusual in ... Nickel tetrahedral complexes are often bright blue and 20 times or more intensely coloured than the octahedral complexes. The ... Nickel azide is complexed by one azo group when dissolved in water, but in other solvents, the nickel atom can have up to four ...
... cations do not usually form coordination complexes with simple Lewis bases due to their low charge of just +1 and ... The latter are said to reside in the second coordination sphere. However, for the alkali metal cations, the second coordination ... though exceptions occur for weak complexes).[10]:90 Lithium in particular has a very rich coordination chemistry in which it ... which due to its small size forms tetrahedral tetrahydrate complexes ([Li(H2O)4)]+); the alkali metals form these complexes ...
99487-99489) Complex chronic care coordination services. *(99495-99496) Transitional care management services ... and chemotherapy and other highly complex drug or highly complex biologic agent administration ...
They are coordination complexes of platinum. These drugs are used to treat almost 50% of cancer patients. In this form of ...
... as ligands in coordination complexes, such as ferricyanide; and as functional groups in organic molecules, such as the nitrile ... A common complex pseudohalide is tetracarbonylcobaltate (Co(CO)4−). The acid HCo(CO)4 is in fact quite a strong acid, though ... Another complex symmetrical pseudohalogen is dicobalt octacarbonyl, Co2(CO)8. This substance can be considered as a dimer of ...
Coordination Complexes of Titanium(IV) for Anticancer Therapy". In Sigel, Astrid; Sigel, Helmut; Freisinger, Eva; Sigel, Roland ... titanium adopts an octahedral coordination geometry in its complexes, but tetrahedral TiCl4 is a notable exception. Because of ... Organometallic complexes. Main article: Organotitanium chemistry. Owing to the important role of titanium compounds as ... The most common organotitanium complex is titanocene dichloride ((C5H5)2TiCl2). Related compounds include Tebbe's reagent and ...
Penland, R.; Lane, T.; Quagliano, J. (1956). "Infrared Absorption Spectra of Inorganic Coordination Complexes. VII. Structural ... Brasted, R.; Hirayama, C. (1959). "An Examination of the Absorption Spectra of Some Cobalt(III)-Amine Complexes. Effect of ... Crawford, B.; Talburt, D.; Johnson, D. (1974). "Effects of Cobalt(III) Complexes on Growth and Metabolism of Escherichia coli ... Heating a solution of the nitrito complex gives the nitro isomer. Nitropentaamminecobalt(III) chloride has been studied for its ...
Djordjević, C.; Katović, V. (1970). "Co-ordination complexes of niobium and tantalum. Part VIII. Complexes of niobium(IV), ... TaCl5 forms stable complexes with ethers: TaCl5 + R2O → TaCl5(OR2) (R = Me, Et) TaCl5 also reacts with phosphorus pentachloride ... The dimeric structure is retained in non-complexing solvents and to a large extent in the molten state. In the vapour state, ... Bullock, J. I.; Parrett, F. W.; Taylor, N. J. (1973). "Some metal halide-phosphorus halide-alkyl halide complexes. Part II. ...
Pascal, Jean-Louis; Frédéric Favier (1998). "Inorganic perchlorato complexes". Coordination Chemistry Reviews. 178-180: 865-902 ...
... s are coordination complexes of transition metals with carbon monoxide ligands. Metal carbonyls are useful in ... Spectra for complexes of lower symmetry are more complex. For example, the IR spectrum of Fe2(CO)9 displays CO bands at 2082, ... 11 CO The synthesis of ionic carbonyl complexes is possible by oxidation or reduction of the neutral complexes. Anionic metal ... M(CO)n + L → M(CO)nL M(CO)nL → M(CO)n-1L + CO The rate of substitution in 18-electron complexes is sometimes catalysed by ...
... s form coordination complexes with most transition metals. They behave as electron-rich analogues of carbon monoxide ... Stephany, R. W.; de Bie, M. J. A.; Drenth, W. (1974). "A 13C-NMR and IR study of isocyanides and some of their complexes". ... Eric Singleton, Hester E. Oosthuizen "Metal Isocyanide Complexes"Advances in Organometallic Chemistry 1983, Volume 22, Pages ... "Chemistry of low-valent metal isocyanide complexes" J.C.S. Dalton, 1981, 219-227. Bassett, J.-M.; Farrugia, L. J.; Stone, F. G ...
Coordination complexes and organometallic compounds are also photoreactive. These reactions can entail cis-trans isomerization ... CO Select photoreactive coordination complexes can undergo oxidation-reduction processes via single electron transfer. This ... UV-irradiation of a THF solution of molybdenum hexacarbonyl gives the THF complex, which is synthetically useful: Mo(CO)6 + THF ... doi:10.1002/14356007.a06_233.pub2 Balzani, Vincenzo; Carassiti, Vittorio (1970). Photochemistry of Coordination Compounds. New ...
"Genotoxicity of the copper antineoplastic coordination complexes casiopeinas". Toxicology in Vitro. 25 (7): 1376-84. doi: ...
During the coordination of the alkene to the intermediate complex, the effect of bite angle on the regioselective formation of ... Diamines form a wide range of coordination complexes. They typically form 5- and 6-membered chelate rings. Examples of the ... Constrained geometry complex Josiphos ligands Zelewsky, A. von (1995). Stereochemistry of Coordination Compounds. Chichester: ... Octahedral complexes prefer angles near 90° and tetrahedral complexes near 110°. Since catalysts often interconvert between ...
... depending on the structure of the coordination complex.[24] See also the section "Coordination chemistry" below. ... Most metals form coordination complexes containing covalently attached carbon monoxide. Only metals in lower oxidation states ... Metal carbonyls in coordination chemistry are usually studied using infrared spectroscopy.. Organic and main group chemistry[ ... Many metal-CO complexes are prepared by decarbonylation of organic solvents, not from CO. For instance, iridium trichloride and ...
However, osmium coordination complexes containing cyclobutyne have been synthesized. Cyclobutene Hopf, Henning; Grunenberg, Jrg ... Adams, Richard D.; Qu, Xiaosu (1996). "The Chemistry of Cyclobutyne and Cyclobutenyl Ligands in Metal Cluster Complexes". ...
Coordination complexes bearing phosphorine as a ligand are known. Phosphorines can bind to metals through phosphorus center. ... Complexes of the diphospha analogue of bipyridine are known. Phosphorines also form pi-complexes, illustrated by V(η6-C5H5P)2. ...
In other complexes he found coordination numbers of 4 or 8. On these views, and other similar views, in 1904 Richard Abegg ... In 1893, Werner was the first to propose correct structures for coordination compounds containing complex ions, in which a ... However, in complexes such as [Co(NH3)6]Cl3 for example, Werner considered that the Co-Cl bonds correspond to a "primary" ... For complexes with more than one type of ligand, Werner succeeded in explaining the number of isomers observed. For example, he ...
These complexes feature three coordination sites that are susceptible to substitution, while the arene ligand is tightly bonded ... 3 complexes.(η6-C6H6)M(CO)3 complexes have been incorporated into high surface area porous materials. (η6-C6H6)M(CO)3 complexes ... doi:10.1016/S0898-8838(09)00201-3. Therrien, B. (2009). "Functionalised η6-arene ruthenium complexes". Coordination Chemistry ... piano stool complexes are stable 18-electron coordination compounds with a variety of chemical and material applications. Early ...
Salts of this coordination complex give yellow solutions. It is usually available as the salt potassium ferrocyanide, which has ...
These metal complexes are often described as salts. They are, however, not ionic but charge-neutral coordination complexes. ... These ethylhexanoate complexes are used in organic and industrial chemical synthesis. They function as catalysts in ...
Carbonyls are coordination complexes between transition metals and carbonyl ligands. Metal carbonyls are complexes that are ... These complexes are covalent. Here is a list of some carbonyls: Cr(CO)6, Co2(CO)8, Fe(CO)5, Mn2(CO)10, Mo(CO)6, Ni(CO)4, W(CO)6 ... As with any other ionic compound, this complex ion could in principle pair with a counterion to form a salt. Other elements are ... Other types of inorganic compounds include the inorganic salts and complexes of the carbon-containing cyanide, cyanate, ...
Cotton, S. A. (1994). "Scandium, Yttrium and the Lanthanides: Inorganic and Coordination Chemistry". Encyclopedia of Inorganic ... "Scandium mineralization associated with hydrothermal lazurite-quartz veins in the Lower Austroalpie Grobgneis complex, East ...
... are coordination complexes.[4] A coordination complex whose centre is a metal atom is called a metal complex. ... Coordination complexes have been known since the beginning of modern chemistry. Early well-known coordination complexes include ... X)Metal(aq) + (Y)Lewis Base(aq) ⇌ (Z)Complex Ion(aq). K. f. =. [. Complex ion. ]. Z. [. Metal ion. ]. X. [. Lewis base. ]. Y. ... Application of coordination compounds[edit]. Metals only exist in solution as coordination complexes, it follows then that this ...
It was developed with a focus on the need to demystify coordination complexes and transition metals. ... This book has been written in a simple and lucid language to help students understand the intricate theories of co-ordination ... Divided into two parts, the first part reviews all the recent developments in the fields of organometallics and co-ordination ...
Is there anything different that needs to be done when considering coordination complexes?. For Part C). I really dont know ... b)If the complex is diamagnetic how is manganese hybridized and what is the geometry of the complex? c)The stability of this ... b)If the complex is diamagnetic how is manganese hybridized and what is the geometry of the complex? ... complex should increase if PH3 Ligands are replaced with PF3 ligands. Why?. What I know. For part a the complex should be ...
... are coordination complexes.[4] A coordination complex whose centre is a metal atom is called a metal complex of d block element ... Nomenclature of coordination complexesEdit. The basic procedure for naming a complex is as followed: *When naming a complex ion ... Coordination complexes have been known since the beginning of modern chemistry. Early well-known coordination complexes include ... X)Metal(aq) + (Y)Lewis Base(aq) ⇌ (Z)Complex Ion(aq). K. f. =. [. Complex ion. ]. Z. [. Metal ion. ]. X. [. Lewis base. ]. Y. ...
... Abbasi, Alireza Skripkin, Mikhail Yu. Stockholm ... 33), Z = 4. In the [Rh(dmso)(6)](3+) complex with slightly distorted octahedral coordination geometry, the Rh-O bond distance ... complex, the mean Rh-O bond distance with O trans to S, 2.083 angstrom, is slightly longer than that for O trans to Cl, 2.067(4 ... complexes with trivalent metal ions. An almost linear correlation was obtained for the MO stretching force constants vs. the ...
The world of coordination complexes is currently stimulated by the quest for efficient catalysts for the electrochemical ... Ligand "noninnocence" in coordination complexes vs. kinetic, mechanistic, and selectivity issues in electrochemical catalysis. ... Coordination complexes are constantly sought as catalysts in the transformation of small molecules involved in contemporary ... Ligand "noninnocence" in coordination complexes vs. kinetic, mechanistic, and selectivity issues in electrochemical catalysis ...
Ligand "noninnocence" in coordination complexes vs. kinetic, mechanistic, and selectivity issues in electrochemical catalysis. ... Ligand "noninnocence" in coordination complexes vs. kinetic, mechanistic, and selectivity issues in electrochemical catalysis ... Ligand "noninnocence" in coordination complexes vs. kinetic, mechanistic, and selectivity issues in electrochemical catalysis ... Ligand "noninnocence" in coordination complexes vs. kinetic, mechanistic, and selectivity issues in electrochemical catalysis ...
... are coordination complexes. A coordination complex whose centre is a metal atom is called a metal complex. Coordination ... Coordination complexes have been known since the beginning of modern chemistry. Early well-known coordination complexes include ... Metallaprism Coordination polymers, in which coordination complexes are the repeating units. Activated complex Introduction to ... Complexes show a variety of possible reactivities: Electron transfers A common reaction between coordination complexes ...
... complexes in NIH 3T3 and MCF7 cells contrasts with the behaviour of the Δ enantiomer, for which a predominant lysosomal ... Enantioselective cellular localisation of europium(III) coordination complexes A. T. Frawley, Holly V. Linford, M. Starck, R. ... The selective mitochondrial localisation of the Λ enantiomer of three different emissive europium(III) complexes in NIH 3T3 and ...
... 2019-01-0313. ... "Deposit Reduction in SCR Aftertreatment Systems by Addition of Ti-Based Coordination Complex to UWS," SAE Technical Paper 2019- ...
First direct assembly of molecular helical complexes into a coordination polymer Sergey Semenov 1 Andrey Yu. Rogachev 1 ... First direct assembly of molecular helical complexes into a coordination polymer. Chemical Communications, Royal Society of ...
Complexes show a variety of possible reactivities:. *Electron transfers A common reaction between coordination complexes ... In chemistry, a coordination complex or metal complex, is a structure consisting of a central atom or ion (usually metallic), ... Naming complexes. The basic procedure for naming a complex:. *When naming a complex ion, the ligands are named before the metal ... Compounds that contain a coordination complex are called coordination compounds. The central atom or ion, together with all ...
Relatively little is known about the coordination involved; to rectify this, the X-ray structures of fourteen novel fluoride- ... alcohol complexes with tetrabutylammonium as the counterion have bee ... Coordination diversity in hydrogen-bonded homoleptic fluoride-alcohol complexes modulates reactivity K. M. Engle, L. Pfeifer, G ... The coordination number varies from two to four depending on the steric bulk of the alcohol and is closely linked to trends in ...
Coordination Chemistry of 1,3-Bis(2-pyridylimino)- and 1,3-Bis(2-thiazolylimino)soindole Copper Complexes: Investigation of ... Meder, Markus B. and Gade, Lutz H. (2004), Coordination Chemistry of 1,3-Bis(2-pyridylimino)- and 1,3-Bis(2-thiazolylimino) ... soindole Copper Complexes: Investigation of Their Catalytic Behavior in Oxidation Reactions. Eur. J. Inorg. Chem., 2004: 2716- ...
... complexes in which one H2O, two pyridines (py), and two p-substituted benzoate (p-RBA) ligands (R = F, Cl, Br, I, CH3, and OCH3 ... The crystal design of polar one-dimensional hydrogen-bonded copper coordination complexes K. Takahashi, N. Hoshino, T. Takeda, ... The crystal design of polar one-dimensional hydrogen-bonded copper coordination complexes ... Each asymmetric [Cu(II)(p-RBA)2(py)2(H2O)] complex formed a polar one-dimensional hydrogen-bonded chain, [Cu(II)(p-RBA)2(py)2(H ...
Both complexes behave as field-induced single molecule magnets in the crystalline phase. These magnetic properties were ... The complexes [Ln2(hfac)6(L)]·nC6H14 (Ln = Dy (1) n = 0, Yb (2) n = 1) with the L chiral 3,14-di-(2-pyridyl)-4,13-diaza[6] ... Slow Relaxation of the Magnetization in Bis-Decorated Chiral Helicene-Based Coordination Complexes of Lanthanides Jessica ... "Slow Relaxation of the Magnetization in Bis-Decorated Chiral Helicene-Based Coordination Complexes of Lanthanides." ...
... and more particularly the coordination mode of hydrides ... the coordination mode of hydrides in such complexes. In this ... DFT 2H quadrupolar coupling constants of ruthenium complexes: a good probe of the coordination of hydrides in conjuction with ... DFT 2H quadrupolar coupling constants of ruthenium complexes: a good probe of the coordination of hydrides in conjuction with ... 2H NMR properties of five mononuclear ruthenium complexes (namely Cp*RuD3(PPh3), Tp*RuD(THT)2, Tp*RuD(D2)(THT) and Tp*RuD(D2)2 ...
Folding of unstructured peptoids and formation of hetero-bimetallic peptoid complexes upon side-chain-to-metal coordination†. ... 2 complexes (see ESI Fig. S80†). Without the support from side-chain Zn(HQ)2 complexes, the free peptoids 12P1 and 12P3 are ... no evidence for the formation of higher order complexes (e.g. 2. :. 4 complexes) was detected. The MS-MS techniques further ... The free 12P1, 12P2, 12P3 and 12P4 peptoids as well as their Zn2+ complexes were further investigated by the 1H-1H COSY 2D-NMR ...
Complexes With Biologically Active Ligands. Part 61 Ni(II) Coordination Compounds of Hydrazine and Heterocyclic Sulfonamides as ... Ternary Ni(II) complexes of hydrazine and eight heterocyclic sulfonamides possessing carbonic anhydrase (CA) inhibitory ... The complexes behave as strong inhibitors for two isozymes (I and II) of carbonic anhydrase. ...
... is concerned with the design of ligands intended to give specifically either binuclear or tetranuclear metal complexes or ... coordination polymers. No attempt is made to provide a comprehensive coverage of these topics, the focus being mainly upon ... Design and its limitations in the construction of bi- and poly-nuclear coordination complexes and coordination polymers. (aka ... Design and its limitations in the construction of bi- and poly-nuclear coordination complexes and coordination polymers. (aka ...
Complexes With Biologically Active Ligands. Part 4. Coordination Compounds of Chlorothiazide With Transition Metal Ions Behave ... Claudiu T. Supuran, "Complexes With Biologically Active Ligands. Part 4. Coordination Compounds of Chlorothiazide With ...
Title: Cobalt complexes of the chelating dicarboxylate ligand "esp": a paddlewheel-type dimer and a heptanuclear coordination ... "Cobalt complexes of the chelating dicarboxylate ligand "esp": a paddlewheel-type dimer and a heptanuclear coordination cluster ... title = {Cobalt complexes of the chelating dicarboxylate ligand "esp": a paddlewheel-type dimer and a heptanuclear coordination ... Investigating subtle 4f vs. 5f coordination differences using kinetically inert Eu( iii ), Tb( iii ), and Cm( iii ) complexes ...
Radical anionic versus neutral 2,2′-bipyridyl coordination in uranium complexes supported by amide and ketimide ligands ... Radical anionic versus neutral 2,2′-bipyridyl coordination in uranium complexes supported by amide and ketimide ligands P. L. ...
How can this be a coordinatively unsaturated complex? If you add 2 more ligands to it then you end up with an electron count of ... I cant figure out how to determine the electron count for these rhodium complexes. Starting with the one at the top. Heres how ...
  • Vibrational spectra and structures of the 1:1 complexes of niobium and tantalum, pentachlorides and tantalum pentabromide with aceto-, perdeuterioaceto-, and propio-nitriles in the solid and solution states and a vibrational analysis of the species MX5,NC·CY3(Y = H or D)". J. Chem. (wikipedia.org)
  • Formation of Ferromagnetic Chains by Photolysis of 1:1 Complexes of Bis(hexafluoro-acetylacetonato)copper(II) with Diazodi(4-pyridyl)methane", Y. Sano, M. Tanaka, N. Koga, K. Matsuda, H. Iwamura, P. Rabu, and M. Drillon, J. Am. Chem. (wikipedia.org)
  • In dilute solution chromium(III) aquo complex has a pKa of about 4.3: [Cr(H2O)+ ⇌ [Cr(H2O)5(OH)]2+ + H+ Thus, the aquo ion is a weak acid, of comparable strength to acetic acid (pKa of about 4.8). (wikipedia.org)
  • The great extent of the bending of an isocyanide due to coordination to an electron-rich transition metal has previously only rarely been observed in such clarity.1141 With the complexes 2, 4, and 5, we present a new type of neutral, trigonal-bipyramidal. (docme.ru)
  • The number of covalent bonds that a cation tends to form with electron donors is its Coordination number. (scribd.com)
  • We describe a 1D and 2D electron spin echo envelope modulation investigation of VO2+ adsorbed on hydroxyapatite (HA) at different concentrations and compare with VO2+-triphosphate (TPH) complexes studied previously in detail, in an effort to provide more insight into the structure of VO2+ coordination in bone. (ubc.ca)
  • Noncovalently linked electron donor-acceptor complexes consisting of either zinc tetraphenylporphyrin, (TPP)Zn, or zinc octaethylporphycene, (OEPc)Zn, as donor and pyridine appended C(60), py approximately C(60), as acceptor, via axial coordination of zinc, are reported. (wichita.edu)
  • Free-energy calculations indicate that the photoinduced electron transfer from the singlet excited zinc tetrapyrrole to C(60) is exergonic, and the estimated rates of electron transfer are found to be (2.4 +/- 0.3) x 10(8) s(-)(1) for the (TPP)Zn-py approximately C(60) complex and (2.2 +/- 0.3) x 10(8) s(-)(1) for the (OEPc)Zn-py approximately C(60) complex, respectively. (wichita.edu)
  • The complex ion hexafluoroferrate(3-) (FeF 6 3− ) has a magnetic moment to be expected from a substance with five unpaired electrons, as does the free iron(3+) ion (Fe 3+ ), whereas the magnetic moment of the closely related hexacyanoferrate(3-) ([Fe(CN) 6 ] 3− ), which also contains Fe 3+ , corresponds to only one unpaired electron. (britannica.com)
  • These complexes are isoelectronic and, incidentally, both obey the 18-electron rule. (wikipedia.org)
  • Associative pathways are not typically seen in 18-electron complexes due to the requisite intermediates having more than 18 electrons associated with the metal atom. (wikipedia.org)
  • Binding of O2 is usually described as proceeding via electron transfer from the metal(II) center to give superoxide (O− 2) complexes of metal(III) centers. (wikipedia.org)
  • The introduction of electron withdrawing substituents at the R position of the β-diketonate ligand favors the reduction of hexavalent uranyl complexes. (wikipedia.org)
  • Bent imidos are a rarity limited by complexes electron count, orbital bonding availability, or some similar phenomenon. (wikipedia.org)
  • The d electron count is a chemistry formalism used to describe the electron configuration of the valence electrons of a transition metal center in a coordination complex. (wikipedia.org)
  • Thus for coordination complexes the standard electron configuration formalism is meaningless and the d electron count formalism is a suitable substitute. (wikipedia.org)
  • The Δ splitting of the d orbitals plays an important role in the electron spin state of a coordination complex. (wikipedia.org)
  • Complexes such as this are called "low-spin" since filling an orbital matches electrons and reduces the total electron spin. (wikipedia.org)
  • So, one electron is put into each of the five d orbitals before any pairing occurs in accord with Hund's rule resulting in what is known as a "high-spin" complex. (wikipedia.org)
  • Such substrates lack π-bonds, consequently a three-centered σ complex is invoked, followed by intramolecular ligand bond cleavage of the ligand (probably by donation of electron pair into the sigma* orbital of the inter ligand bond) to form the oxidized complex. (wikipedia.org)
  • As shown below, the initial metal complex has 16 valence electrons and a coordination number of four whereas the product is a six-coordinate 18 electron complex. (wikipedia.org)
  • That means gallium (III) and iron (III) are similar in similar coordination number, electrical charge, ion diameter and electron configuration. (wikipedia.org)
  • Bandshape analyses of these spectra yielded activation parameters for restricted rotation of the thiophene and selenophene ligands in these complexes. (unt.edu)
  • They are, however, not ionic but charge-neutral coordination complexes. (wikipedia.org)
  • There are various hand waving arguments for this phenomenon including that "the ns electrons are farther away from the nuclei and thus ionized first" while ignoring results based on neutral complexes. (wikipedia.org)
  • Near neutral pH, the principle complex is [Fe(edta)(H2O)]−, although most sources ignore the aquo ligand. (wikipedia.org)
  • The structure and bonding of the ligand are studied by elemental analysis, magnetic susceptibility measurements, IR, 1HNMR, TG/DTA, X-ray diffraction studies, and electronic spectra of the complexes. (deepdyve.com)
  • 1H NMR spectra indicate that (py)2CHPh and (py)2(N-Me1m)COH are present as bidentates in methanol solutions of their complexes, with the latter coordinated via the imidazolyl ring and one pyridyl ring. (edu.au)
  • Spectra are consistent with the presence of weak pi interactions between mercury and phenyl rings in the (py)CHPh2 and (py)2CHPh complexes and the uncoordinated pyridyl ring in the (py)2(N-Me1m)COH complex. (edu.au)
  • Ligand field theory (LFT) describes the bonding, orbital arrangement, and other characteristics of coordination complexes. (wikipedia.org)
  • Griffith and Orgel championed ligand field theory as a more accurate description of such complexes. (wikipedia.org)
  • The conjugate base derived from 1,3-ketones form coordination complexes. (wikipedia.org)
  • The nitrite ion is known to form coordination complexes in at least five different ways. (wikipedia.org)
  • Bidentate phosphine with a natural bite angle of 120° preferentially occupy diequatorial sites in a trigonal bipyramidal complex whereas a bidentate phosphine with a natural bite angle of 90° preferentially occupy apical-equatorial positions. (wikipedia.org)
  • With a bite angle of approximately 113°, BISBI spans sites on equatorial plane of the trigonal bipyrimidal intermediate complex (Figure 6). (wikipedia.org)
  • Diamines form a wide range of coordination complexes. (wikipedia.org)
  • Vinyl copper complexes are formed by transmetallation and carboxylation is realized with a similar pathway giving tetrasubstituted aliphatic vinyl carboxylic acids . (wikipedia.org)