• Model studies on the active site of cytochrome P-450: An iron(II)-porphyrin carrying a strapped thiolate ligand. (nyu.edu)
  • Binuclear complexes of a covalently-linked porphyrin-bipyridine ligand. (nyu.edu)
  • In this work, a simple CMOF is synthesized through a facile one-pot method by using Zn(II), tetra(4-carboxyphenyl)-porphyrin (TCPP), and d-phenylalanine methyl ester (d-Phe-OMe) as metal ion, organic ligand, and chiral source, respectively. (bvsalud.org)
  • A protected S-acetylthio porphyrin was synthesized and attached to the Au38(2-phenylethanethiolate)24 cluster in a ligand exchange reaction. (unige.ch)
  • Then, from these studies it is possible to determine the screw sense excess of a PPA, highly important in applications such as chiral stationary phases in HPLC or asymmetric synthesis. (nature.com)
  • Biosynthesis of porphyrins and related macrocyles, Part 13, Structure of the protoporphyrin isomer derived from coproporphyrinogen-IV by the action of beef-liver coproporphyrinogenase: Synthesis of protoporphyrin-XIII. (nyu.edu)
  • Synthesis of metalloreceptors containing porphyrin subunits and formation of mixed substrate supermolecules by binding of organic substrates and metal ions. (nyu.edu)
  • Synthesis of tetrameric and hexameric cyclo-porphyrins. (nyu.edu)
  • Tetrathiafulvalene-[2.2]paracyclophanes: Synthesis, chiral structures and chiroptical properties. (univ-amu.fr)
  • Researchers from Universidade Federal de Sao Carlos and Universidade Federal de Rio de Janeiro have demonstrated the synthesis of a range of meso-substituted porphyrins under continuous flow conditions. (syrris.com)
  • Doyle Michael P.: Chiral catalysts for enantioselective carbenoid cyclopropanation reactions. (iupac.org)
  • Furthermore, a part of them is harnessed as chiral stationary phases for chromatographic chiral separation and as chiral adsorbents for enantioselective adsorption/crystallization, resulting in good enantioseparation efficiency. (bvsalud.org)
  • However, if the two supramolecular components are mixed in the presence of a chiral template, then an induced circular dichroism signal (ICD) appears in the Soret region (the main absorption feature of porphyrins in the visible region whose maximum and intensity are strongly affected by the aggregation state). (torvergata.it)
  • Pradeep Chullikkattil P., Das Samar K.: Coordination and supramolecular aspects of the metal complexes of chiral N-salicyl-β-amino alcohol Schiff base ligands: Towards understanding the roles of weak interactions in their catalytic reactions. (iupac.org)
  • Porphyrin complexes consist of a square planar MN4 core. (wikipedia.org)
  • Metal complexes derived from porphyrins, often called metalloporphyins, occur naturally. (wikipedia.org)
  • One of the best-known families of porphyrin complexes is heme, the pigment in red blood cells, a cofactor of the protein hemoglobin. (wikipedia.org)
  • Mezzetti Antonio: Ruthenium complexes with chiral tetradentate PNNP ligands: Asymmetric catalysis from the viewpoint of inorganic chemistry. (iupac.org)
  • Individual molecules in porphyrin or phthalocyanine thin films are able to oxidize cobalt atoms into formal Co(II) species. (uni-marburg.de)
  • Induced circular dichroism of porphyrin aggregates, orbital angular momentum interaction in electronic coupling, are proposed as possible mechanisms for the asymmetry of electronic tunneling. (pitt.edu)
  • Cyclopiperazines: A new approach to chiral macrocyclic receptors. (nyu.edu)
  • Upon the inclusion of optically active pyrene, chiral induction of the host structure is observed by CD spectrum. (soken.ac.jp)
  • To date, a large amount of optically active helical polymers as chiral selectors have been synthesized via two strategies. (bvsalud.org)
  • In plants, an essential porphyrin derivative is chlorophyll, which is involved in light harvesting and electron transfer in photosynthesis. (wikipedia.org)
  • Synthetic porphyrins containing adjacent, redox-active species models of biological electron transfer sites. (nyu.edu)
  • Heterogeneous electron transfer of protein, porphyrins through self-assembled monolayer (SAM) at gold electrodes was studied. (pitt.edu)
  • In a study of photo-induced electron transfer of porphyrins through SAMs with chiral structure, an asymmetrical effect on the efficiency of electron transfer through these chiral chain structures was found. (pitt.edu)
  • He synthesized a porphyrin catenane that constitutes multi-component, photo-induced electron transfer system where components are assembled and arrayed through catenation. (soken.ac.jp)
  • n Porphyrin assemblies take essential role in biological systems for oxygen transport, electron transfer, and energy migration and conversion. (soken.ac.jp)
  • Described in Chapter 4 is the construction of [2] catenane composed of Zn(II) and Au(III) porphyrin-incorporated macrocycles which is capable of intramolecular photo induced electron transfer between donor and acceptor components. (soken.ac.jp)
  • Porphyrins (/ˈpɔːrfərɪn/ POR-fər-in) are a group of heterocyclic macrocycle organic compounds, composed of four modified pyrrole subunits interconnected at their α carbon atoms via methine bridges (=CH−). In vertebrates, an essential member of the porphyrin group is heme, which is a component of hemoproteins, whose functions include carrying oxygen in the bloodstream. (wikipedia.org)
  • When there is no metal ion (or atom) bound to the nitrogens in the center, then the compounds are called free porphine or free porphyrin. (wikipedia.org)
  • A boronic-acid-appended porphyrin (1) forms stacked aggregates in aqueous solution and in the presence of sugars the aggregates give exciton-coupling bands specific to the absolute configuration of added sugars. (elsevierpure.com)
  • Removal of the template does not significantly affect the intensity of the ICD: the inert aggregates have memorized the chiral template shape. (torvergata.it)
  • As the thus-far reported largest chiral tetrapyrrole-based conjugated systems, phthalocyanine-porphyrin-fused oligomers with induced chirality nature have been designed and isolated. (rsc.org)
  • In particular, we have observed that self-aggregation of opposite charged, achiral porphyrins does not lead to induced chirality even if a chiral template is added after their aggregation. (torvergata.it)
  • Interestingly, the CMOFs synthesized at different temperatures (25 and 160 °C) display quite different morphologies and diametrically opposite chirality due to the different interaction modes between TCPP and d-Phe-OMe at 25 and 160 °C. Next, the CMOFs synthesized at 25 and 160 °C are utilized for the chiral discrimination of the isomers of tryptophan (Trp), resulting in exactly the reverse effect. (bvsalud.org)
  • Gharaati Shadab, Moghadam Majid, Tangestaninejad Shahram, Mirkhani Valiollah, Mohammadpoor-Baltork Iraj, Barati Behjat, Sadegh Faranak: High-valent tin(IV) porphyrins: Efficient and selective catalysts for cyclopropanation of styrene derivatives with EDA under mild conditions. (iupac.org)
  • Industrial uses include the production of drugs, biodegradable plastics, and chiral catalysts. (elitehealthonline.com)
  • citation needed] In non-photosynthetic eukaryotes such as animals, insects, fungi, and protozoa, as well as the α-proteobacteria group of bacteria, the committed step for porphyrin biosynthesis is the formation of δ-aminolevulinic acid (δ-ALA, 5-ALA or dALA) by the reaction of the amino acid glycine with succinyl-CoA from the citric acid cycle. (wikipedia.org)
  • Controlled conformational changes in covalently-linked porphyrin dimers. (nyu.edu)
  • Strong interactions in covalently stacked trimeric porphyrins. (nyu.edu)
  • cluster and covalently attached porphyrin. (unige.ch)
  • Chiral bipyridine macrocycles as novel metallocatalysts. (nyu.edu)
  • Alternatively, an achiral polymer is prepared first followed by static or dynamic chiral induction. (bvsalud.org)
  • Mixed substrate supermolecules: Binding of organic substrates and of metal ions to heterotropic coreceptors containing porphyrin subunits. (nyu.edu)
  • Poster presentation for the 2009 University Scholars Day at the University of North Texas discussing research on chiral porphyrins as selective pharmaceutical receptors. (unt.edu)
  • A porphyrin with an iron atom of the type found in myoglobin, hemoglobin, or certain cytochromes is called heme. (wikipedia.org)
  • Recently, we disclosed artificial enzymes constructed from the apo form of heme proteins and iridium porphyrins that catalyze the insertion of carbenes into a C-H bond. (ward-lab.ch)
  • and (5) stereogenic centers at the outside involving porphyrins discerning helicity associated with SWNTs. (ly3295668inhibitor.com)
  • The entity has a prism-like framework composed of three porphyrin units and six metal centers. (soken.ac.jp)
  • Zinc can be incorporated into the porphyrin attached to the cluster, as evidence by absorption and fluorescence spectroscopy, however, the reaction is slow.Quenching of the chromophores fluorescence is observed, which can be explained by energy transfer from the porphyrin to the cluster. (unige.ch)
  • n As an extension of artificial porphyrin assemblies, making a porphyrin-based hollow framework is also expected to open a new porphyrin chemistry through host-guest interaction. (soken.ac.jp)
  • Representative porphyrins and derivatives Derivatives of protoporphyrin IX are common in nature, the precursor to hemes. (wikipedia.org)
  • Our results indicate that the thermodynamic route leads to a monomeric, protonated final state, but the kinetic pathway ends with self-assemblies of the title porphyrin. (torvergata.it)
  • With a total of 26 π-electrons, of which 18 π-electrons form a planar, continuous cycle, the porphyrin ring structure is often described as aromatic. (wikipedia.org)
  • To perform these studies, we used a library of well folded PPAs and different copolymers series made by enantiomeric comonomers that show chiral conflict effect. (nature.com)
  • Chiral high performance liquid chromatography of the functionalized cluster yielded enantiomeric pairs of clusters probably differing in the binding site of the porphyrin. (unige.ch)
  • The field of organic geochemistry had its origins in the isolation of porphyrins from petroleum. (wikipedia.org)
  • Chiral metal-organic frameworks (CMOFs) have attracted considerable attention in chiral discrimination and separation. (bvsalud.org)
  • Finally, he prepared a porphyrin-based hollow framework by self-assembly. (soken.ac.jp)
  • Remarkably, these species - now inherently chiral - act as very efficient templates for self-aggregation of additional non-chiral porphyrins. (torvergata.it)
  • Ruffled" or saddle-shaped porphyrins is attributed to interactions of the system with its environment. (wikipedia.org)
  • In this regard, designing molecular assemblies using porphyrin units is a promising approach for constructing artificial functional systems. (soken.ac.jp)
  • Ghanem Ashraf, Gardiner Michael G., Williamson Rachel M., Müller Paul: First X-ray Structure of a N -Naphthaloyl-Tethered Chiral Dirhodium(II) Complex: Structural Basis for Tether Substitution Improving Asymmetric Control in Olefin Cyclopropanation. (iupac.org)
  • Chapter 5 describes a construction of prism-like hollow structure composed of three porphyrin units and six cationic Pd(II) complex. (soken.ac.jp)
  • This much-improved method demonstrates the multi-gram scale-up of highly pure porphyrins in a safe, cost-effective, reproducible and robust manner. (syrris.com)
  • Chiral resolution is very important and still a big challenge due to different biological activity and same physicochemical property of one pair (R)- and (S)-isomer. (bvsalud.org)
  • One result of the large conjugated system is that porphyrins typically absorb strongly in the visible region of the electromagnetic spectrum, i.e. they are deeply colored. (wikipedia.org)
  • Petroleum is sometimes "fingerprinted" by analysis of trace amounts of nickel and vanadyl porphyrins. (wikipedia.org)
  • The developed CMOF-based chiral sensors also exhibit excellent reproducibility, suggesting their great potential for chiral analysis. (bvsalud.org)
  • Dive into the research topics of 'Sugar-induced chiral orientation of a boronic-acid-appended porphyrin stack. (elsevierpure.com)