• 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 σ-type bonds between ligand(s) and the central atom). (thefullwiki.org)
  • Different ligand structural arrangements result from the coordination number. (thefullwiki.org)
  • The complexes [Ln 2 (hfac) 6 ( L )]·nC 6 H 14 (Ln = Dy ( 1 ) n = 0, Yb ( 2 ) n = 1) with the L chiral 3,14-di-(2-pyridyl)-4,13-diazahelicene ligand (hfac − = 1,1,1,5,5,5-hexafluoroacetylacetonate) have been synthesized in their racemic form and structurally and magnetically characterized. (mdpi.com)
  • Pakula, Ryan J., and Berry, John F.. Cobalt complexes of the chelating dicarboxylate ligand "esp": a paddlewheel-type dimer and a heptanuclear coordination cluster . (osti.gov)
  • The coordination chemistry of zinc alkyls and alkoxides is shown to be dependent on ligand structure, most notably on the choice of heteroatom donor and phenolate backbone substituent. (bl.uk)
  • Ni(II) and Pd(II) organometallic and coordination complexes with a new tridentate N,N,O-donor ligand. (edu.mx)
  • NJosé C. Alvarado-Monzón, Gabriel Andreu-de-Riquer, J. Alfredo Gutiérrez, Luis M. De León-Rodríguez, Oracio Serrano, José G. Alvarado-Rodríguez, Jorge A. López, i(II) and Pd(II) organometallic and coordination complexes with a new tridentate N,N,O-donor ligand. (edu.mx)
  • Complexes 16 had a square planar structure with the ligand being tridentate through the NNO atoms. (edu.mx)
  • A similar reaction involving the chelating ligand dppmS(2) [Ph(2)P(S)CH2P(S)Ph(2)] afforded the complex [TeCl4(dppmS(2))], which was also characterized by X-ray crystallography and found to be similar in most respects to the OPPh, complex. (ucl.ac.uk)
  • 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)
  • The ligand and the new complexes were tested in vitro to evaluate their activity against the bacteria Escherichia coli and Staphylococcus aureus. (deepdyve.com)
  • NMR experiments show this shift to be due to equilibration of 1 with an aquo complex (1b) (K(eff) = (6 +/- 3) x 10(-3)) that forms upon displacement of the coordinated ether in the hemilabile POMe ligand. (ubc.ca)
  • A survey of the contemporary challenges of the field of unsubstituted group 15 element ligand complexes (excluding N) is given. (uni-regensburg.de)
  • The focus of the article is on the coordination chemistry behaviour of such En ligand complexes. (uni-regensburg.de)
  • This field is subdivided into two areas of reactivity: En ligand complexes with (i) noncoordinated Lewis-acidic cations and (ii) Lewis-acidic coordination compounds containing at least one permanently coordinating ligand. (uni-regensburg.de)
  • The antimutagenicity of twelve phenothiaizine-metal complexes, four phenothiazines and three inorganic metals was examined on Salmonella typhimurium TA98 strain treated with a strain-specific, direct-acting mutagen, 4-nitro-o-phenylene-diamine, and the ligand-DNA interaction was analyzed by ultraviolet (UV) spectrophotometry. (elsevier.com)
  • Tridentate, tetradentate, pentadentate, and hexadentate ligands Complexation reactions involve a metal ion M reacting with a ligand L to form a complex ML. M+L ML Complexation reactions occur in a stepwise fashion, and the reaction above is often followed by additional reactions: ML + L ML2 ML2 + L ML3 MLn-1 + L MLn Unidentate ligands invariably add in a series of steps. (scribd.com)
  • Because the arene or arenyl ligands take three coordination sites of the metal ion, only three remain free for interaction with additional ligand(s). (elsevier.com)
  • In this work we designed a novel class of luminescent square planar platinum complexes displaying a π-bonded chiral thioquinonoid ligand. (ipcm.fr)
  • Coordinative saturation of the ruthenium centre is achieved by intramolecular coordination of the appended hydroxy function, thus rendering the functionalized arene an eight electron donor chelate ligand. (uni-konstanz.de)
  • G. P. Wang, X. C. Fu and L. G. Zhu, "Preparation, Crystal Structure and Antineoplastic Activity of Copper (II)- Fluoroquinolone-Phenanthroline Mixed-Ligand Complex," Chinese Journal of Inorganic Chemistry, Vol. 19, No. 9, 2003, pp. 78- 84. (scirp.org)
  • The metal-ion-binding properties of the isomeric (Dien)Pt(PMEA-N7) species studied previously differ in so far that the resulting M[(Dien)Pt(PMEA-N7)]2+ complexes are somewhat less stable, but again Cu2+ and Zn2+ also form with this ligand comparable amounts of the mentioned five-membered chelates. (unibas.ch)
  • Several thallium(III) porphyrin complexes [Tl(por)X] with the axial ligand X = MeCO 2 , CF 3 CO 2 , Cl, Br, I, CN, SCN or N 3 , have been obtained via ligand-exchange reactions from the corresponding thallium(III) trifluoroacetates. (syr.edu)
  • An X-ray structure determination reveals the expected sulfide-bridged structure, with an N-bonded thiocyanate ligand and a square-planar coordination geometry about nickel. (waikato.ac.nz)
  • Encouraged by the high photoluminescence (PL) of the bis-Zn-II salphen complexes, a series of co-ordination polymers have been successfully developed through metal-ligand interactions between the bis-Zn-II salphen complexes and functional ditopic ligands. (edu.hk)
  • In this study, we have explore the Minimum Inhibitory Concentration (both liquid & Disc method) of schiff base ligand such as Pyrazole, diketone and their metal (Ni, Cu, Co, Mn, Vn, Ca, Zn) bound complexes against various microbial pathogens. (scribd.com)
  • The MIC values indicate the most of the complexes have higher antimicrobial activity than the free ligand. (scribd.com)
  • UV-vis MCD data for ferrous DGCR8 reveal features consistent with bis-thiol heme iron coordination, and resonance Raman data for the ferrous-CO form are consistent with a thiol ligand trans to the CO. These studies support retention of DGCR8 cysteine coordination upon reduction, a conclusion distinct from those of previous studies of a different ferrous DGCR8 isoform. (uea.ac.uk)
  • Most complexes containing the NO ligand can be viewed as derivatives of the nitrosyl cation, NO+. (wikipedia.org)
  • The nitrosyl cation is isoelectronic with carbon monoxide, thus the bonding between a nitrosyl ligand and a metal follows the same principles as the bonding in carbonyl complexes. (wikipedia.org)
  • Thus, [Co(en)2(NO)Cl]+, with seven electrons of pi-symmetry (six in t2g orbitals and one on NO), adopts a bent NO ligand, whereas [Fe(CN)5(NO)]3−, with six electrons of pi-symmetry, adopts a linear nitrosyl. (wikipedia.org)
  • The results are exactly the same if the nitrosyl ligand were considered NO+ or NO−. Metal complexes containing only nitrosyl ligands are called isoleptic nitrosyls. (wikipedia.org)
  • Start Forskningsoutput Mononuclear complexes and a coordination polymer of the 2-py. (lu.se)
  • A coordination polymer, [{P((NHPy)-Py-2)(4)Cu2Cl4}ClOinfinity) (4), was also obtained by treating [P((NHPy)-Py-2)(4)]Cl with copper perchlorate hexahydrate at ambient temperature. (lu.se)
  • Hence, the functional ditopic ligands should exhibit great potential in avoiding exciton quenching in the emission layer formed by these bis-Zn-II salphen coordination polymers in polymer light-emitting diodes (PLEDs). (edu.hk)
  • I can't figure out how to determine the electron count for these rhodium complexes. (physicsforums.com)
  • X-ray diffraction measurements have been carried out for aqueous solutions of chloride, bromide, iodide, perchlorate, and sulfate of tris(ethylenediamine)rhodium(III) and chromium(III) complexes. (nii.ac.jp)
  • 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)
  • Chapters dedicated to the elementary physical interactions and molecular building blocks, from simple sugars to complex, folded protein structures, provide the knowledge base for such advanced topics as the self-assembly of biological materials, the tuning of their properties and their processing. (wiley.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)
  • complexes of different structures probably contribute to the spectra of VO2+-HA. (ubc.ca)
  • Chromium tricarbonyl complexes of thiophene, selenophene, and their alkyl-substituted derivatives were prepared and variable-temperature {sup 13}C NMR spectra of these complexes were recorded in dimethyl ether. (unt.edu)
  • Bandshape analyses of these spectra yielded activation parameters for restricted rotation of the thiophene and selenophene ligands in these complexes. (unt.edu)
  • These bis-Zn-II salphen coordination polymers can exhibit high thermal stability up to 433 degrees C. Their PL spectra show an emission maximum peaking at ca. 570 nm in solution and ca. 580 nm in neat films. (edu.hk)
  • Treatment of I with sodium tellurophenolate in THF results in the formation of the ionic complex [(Cymen)Ru(μ-TePh)3Ru(Cymen)]+[(CO)3Re(μ-TePh)3Re(CO) (III) with homobinuclear cation and anion. (deepdyve.com)
  • II- Resolution of metal complexes via chiral anion recognition. (ipcm.fr)
  • The coordination number varies from two to four depending on the steric bulk of the alcohol and is closely linked to trends in reactivity. (rsc.org)
  • This review surveys the coordination chemistry of copper in the +1 and +2 oxidation states with sulphur-containing ligands. (syr.edu)
  • A brief overview of the Cu enzymes is given, and a discussion of copper-sulphur complexes of metallotherapeutical value is included. (syr.edu)
  • Karlin, KD & Zubieta, J 1979, ' Coordination chemistry of copper-sulphur complexes of physiological relevance ', Inorganic Perspectives in Biology and Medicine , vol. 2, no. 2, pp. 127-149. (syr.edu)
  • The copper(II) complexes were characterized by means of potentiometric, UV-vis, circular dichroism and electron paramagnetic resonance techniques. (unipi.it)
  • It is concluded that the presence of four prolyl residues, that are break points in copper coordination, induces the metal-assisted formation of macrochelates as well as the formation of binuclear species. (unipi.it)
  • The PL investigation of the neat films for these bis-Zn-II salphen coordination polymers has indicated that the functional ditopic ligands can restrain the molecular packing among the bis-Zn-II salphen units for enhancing their PL intensity. (edu.hk)
  • Benefiting from such a molecular design, these bis-Zn-II salphen coordination polymers can exhibit a peak luminance (L-max) of 8658 cd m(-2), a maximum external quantum efficiency (eta(ext)) of 3.18%, a maximum current efficiency (eta(L)) of 6.2 cd A(-1) and a maximum power efficiency (eta(P)) of 4.4 lm W-1. (edu.hk)
  • These attractive results represent the state-of-the-art EL performances ever achieved by Schiff base Zn-II coordination polymers, which would provide significant clues for developing high performance PLEDs based on Schiff base Zn-II coordination polymers. (edu.hk)
  • This is the case for reactions involving metalloporphyrins as well as vitamin B12 derivatives and similar cobalt complexes for which a wealth of experimental data is available. (pnas.org)
  • A dramatic change in binding mode is observed upon reduction from Ni-II to Ni-I. The Ni-I derivatives include an unprecedented NiI bis(C-H) agostic complex and a two-coordinate Ni-I complex. (ubc.ca)
  • 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)
  • The relative rates of electron transfer in the different reactions and the influence of π-acceptor ligands on the ruthenium(II) reduction of the cobalt(III) complexes are discussed. (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)
  • Electron-nuclear double resonance spectroscopy data exclude histidine or water as axial ligands for ferric DGCR8 and favor bis-thiolate coordination in this form. (uea.ac.uk)
  • These complexes are isoelectronic and, incidentally, both obey the 18-electron rule. (wikipedia.org)
  • The singlet emission studies show efficient quenching of the investigated zinc tetrapyrrole emission upon axial coordination of pyridine appended C(60). (wichita.edu)
  • These studies indicate DGCR8 bis-Cys heme iron ligation, with conversion from bis-thiolate (Cys-/Cys-) axial coordination in ferric DGCR8 to bis-thiol (CysH/CysH) coordination in ferrous DGCR8. (uea.ac.uk)
  • It is shown that under the condition of PH1 and 110℃ - 116℃, the autoclave method and solvothermal method can be utilized to obtain the ciprofloxacin complexes with Cu 2+ , Mn 2+ and Zr 2+ as the metal ligands after reacting for 8 hours. (scirp.org)
  • Ternary Ni(II) complexes of hydrazine and eight heterocyclic sulfonamides possessing carbonic anhydrase (CA) inhibitory properties, were prepared and characterized by elemental analysis, spectroscopic, magnetic, thermogravimetric, and conductimetric measurements. (hindawi.com)
  • All glucose complexes unveiled good stability and solubility in organic and aqueous media. (uzh.ch)
  • The stability constants of the M[(Dien)Pt(PMEA-N1)]2+ complexes with M2+ = Mg2+, Ca2+, Ni2+, Cu2+ and Zn2+ were measured by potentiometric pH titrations in aqueous solution at 25 degrees C and I = 0.1 M (NaNO3). (unibas.ch)