The carbon monoxide complex of [NiFe]hydrogenase from Desulfovibrio vulgaris Miyazaki F has been characterized by X-ray crystallography and absorption resonance Raman spectroscopy. Nine crystal structures the in CO-bound CO-liberated forms were determined at 1.2−1.4 Å resolution. exogenously added CO was assigned to be bound Ni atom Ni−Fe active site. not replaced with H2 dark 100 K, but liberated illumination a strong white light. Ni−C distances Ni−C−O angles about 1.77 160°, respectively,...

α-Amino acids are highly functional small molecules whose side chain groups like prototypes of metal coordination and weak interactions in proteins. This perspective focuses on non-covalent or the amino acids, such as charged arginine aspartic acid aromatic rings tyrosine tryptophan, complexes solution solid state. The structure function exhibiting their biological relevance described.

New dinucleating ligands having two metal-binding sites bridged by an imidazolate moiety, Hbdpi and HMe4bdpi (Hbdpi = 4,5-bis(di(2-pyridylmethyl)aminomethyl)imidazole, 4,5-bis(di(6-methyl-2-pyridylmethyl)aminomethyl)imidazole), have been designed synthesized as model for copper−zinc superoxide dismutase (Cu,Zn-SOD). The corresponding mononucleating ligand, MeIm(Py)2 (MeIm(Py)2 ((1-methyl-4-imidazolyl)methyl)bis(2-pyridylmethyl)amine), has also comparison. imidazolate-bridged Cu(II)−Cu(II)...

The one-electron oxidized species of a Ni(II)-phenolate complex has been shown to be in the Ni(II)-phenoxyl radical state at room temperature and Ni(III)-phenolate < -120 degrees C, indicating that oxidation is dependent.

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure-stability relationship in ternary copper(II) complexes involving aromatic amines and tyrosine or related amino acids. Intramolecular ring stacking its regulation through phosphorylationOsamu Yamauchi Akira OdaniCite this: J. Am. Chem. Soc. 1985, 107, 21, 5938–5945Publication Date (Print):October 1, 1985Publication History Published online1 May 2002Published inissue 1 October...

Group 10 metal(II) complexes of H2tbu-salen (H2tbu-salen = N,N'-bis(3',5'-di-tert-butylsalicylidene)ethylenediamine) and H2tbu-salcn (H2tbu-salcn N,N'-bis(3',5'-di-tert-butylsalicylidene)-1,2-cyclohexanediamine) containing two 2,4-di(tert-butyl)phenol moieties, [Ni(tbu-salen)] (1a), [Ni(tbu-salcn)] (1b), [Pd(tbu-salen)] (2a), [Pd(tbu-salcn)] (2b), [Pt(tbu-salen)] (3), were prepared structurally characterized by X-ray diffraction, the electronic structures their one-electron-oxidized species...

Structures and stabilization due to stacking of ternary copper(II) complexes containing an aromatic amino acid (AA) diamine (DA), Cu(AA)(DA), have been investigated by potentiometric, spectroscopic, X-ray diffraction methods. For the systems with AA = para-X-substituted l-phenylalanine (l-XPhe; X H, NO2, OH, NH2) DA 2,2'-bipyridine (bpy) or 1,10-phenanthroline (phen), difference absorption spectra in region 320−400 nm exhibited a peak assignable charge transfer interaction between rings...

α-Amino acid residues exhibit various functions in biological systems. The side chain groups are very important for formation of the metal center and its catalytic action proteins. They involved binding, molecular recognition by weak interactions, enzyme catalysis, environment. This perspective focuses on recent studies characterization metal–amino complexes involving imidazole, phenol, indole, or alkyl groups, their reactivities, some selected metal–side group interactions.

An anion-exchange strategy was used to prepare two helical structures made up of cucurbituril and asymmetric copper(II) complexes containing 8-hydroxyquinoline-5-sulfonate 3,5-diiodosalicylate (right half picture) or 3-iodobenzoate (left half). The shape-matching interactions between the copper were assisted by iodo substituents. Iodine has long been paid considerable attention for its fascinating chemical behavior1, 2 biological essentiality.3 use iodine as electrical conductor in synthesis...

The dianion is the key! Complexes of type [Cu(Arg)2](L)·nH20 (L = aromatic dicarboxylate, n 5,6) formed by self-assembly show double-helical structures in solid state, which comprise infinite [Cu(Arg)2]2+-L2− strands (shown schematically below). In these, dianions function as bridging ligands, bound through guanidinium–carboxylate pairs, between complex cations and read information handedness coded [Cu(Arg)2]2+ units.

A novel tetradentate ligand has been shown to react with Cu(OAc)2 form 1, which mimics the active-site structure of galactose oxidase. The reaction CuII depends on counterions available; Cu(ClO4)2 system gives a phenoxyl radical species and [Cu(CH3CN)4]ClO4 by disproportionation (see scheme).

Abstract

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTernary metal(II) complexes with tyrosine-containing dipeptides. Structures of copper(II) and palladium(II) involving L-tyrosylglycine stabilization due to intramolecular aromatic ring stackingTamotsu Sugimori, Kimio Shibakawa, Hideki Masuda, Akira Odani, Osamu YamauchiCite this: Inorg. Chem. 1993, 32, 22, 4951–4959Publication Date (Print):October 1, 1993Publication History Published online1 May 2002Published inissue 1 October...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTProton NMR study of aromatic ring stacking in ternary palladium(II) complexes involving diamines and dipeptides with N-terminal amino acid residuesAkira Odani, Shuhei Deguchi, Osamu YamauchiCite this: Inorg. Chem. 1986, 25, 1, 62–69Publication Date (Print):January 1986Publication History Published online1 May 2002Published inissue 1 January 1986https://pubs.acs.org/doi/10.1021/ic00221a017https://doi.org/10.1021/ic00221a017research-articleACS...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHistidine-containing ternary amino acid-copper(II) complexes. Syntheses and propertiesOsamu Yamauchi, Takeshi Sakurai, Akitsugu NakaharaCite this: J. Am. Chem. Soc. 1979, 101, 15, 4164–4172Publication Date (Print):July 1, 1979Publication History Published online1 May 2002Published inissue 1 July 1979https://pubs.acs.org/doi/10.1021/ja00509a024https://doi.org/10.1021/ja00509a024research-articleACS PublicationsRequest reuse permissionsArticle...

The reactions of the dipeptides containing glycine and/or β-alanine with an equimolar amount copper(II) nitrate in acid solution were investigated potentiometrically, and stability constants for chelates formed determined at 25 °C by method Datta Rabin. composition [Cu.peptide(OH 2 )] isolated pure state. exhibited analogous reactivities, constants, log K 1 , charged chelates, CuHL + found to be between 5.5–5.7. Comparison values glycylglycine β-alanyl-glycine those suggests that these act...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPteridine-containing ternary and quaternary complexes as models for metalloenzyme-pterin cofactor-substrate association. Structure of copper(II)-2,2'-bipyridine-lumazine complex successful equilibrium study a copper(II) systemAkira Odani, Hideki Masuda, Keiichi Inukai, Osamu YamauchiCite this: J. Am. Chem. Soc. 1992, 114, 16, 6294–6300Publication Date (Print):July 1, 1992Publication History Published online1 May 2002Published inissue 1 July...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAromatic ring stacking in the ternary copper(II) complexes [Cu(histamine)(L-AA)(ClO4)] (AA = phenylalaninate, tyrosinate). Structural evidence for intramolecular involving a coordinated imidazole ringOsamu Yamauchi, Akira Odani, Takamitsu Kohzuma, Hideki Masuda, Koshiro Toriumi, and Kazuo SaitoCite this: Inorg. Chem. 1989, 28, 22, 4066–4068Publication Date (Print):November 1, 1989Publication History Published online1 May 2002Published inissue 1...

Abstract Two copper complexes containing l-histidine and l-asparagine crystallize from aqueous solution at pH 7.0. Both crystals are monoclinic, space group P21. l-Asparaginato-l-histidinatocopper(II): a=10.913(3), b=12.911(4), c=10.206(3) Å, β=113.83(2)°, Z=4. l-Asparaginato-l-histidinatoaquacopper(II) trihydrate: a=12.654(4), b=11.623(4), c=5.931(2) β=100.47(3)°, Z=2. In both structures, four coordinating atoms in an approximately planar arrangement around the α-amino imidazole δ-nitrogen...

Abstract Synthetic and spectroscopic studies have been made on the ternary copper(II) complexes containing two optically active α-amino acids with charged groups in their side chains. Thus, for all combinations of ligands A B, where refers to aspartic or glutamic acid B arginine, lysine, ornithine, mixed ligand complexes, [Cu(l-A)(l-B)] [Cu(d-A)(l-B)] except [Cu(l-aspartate)(l-ornithine)], were isolated as crystals. Infrared spectra suggested presence geometrical isomers. By comparing...

A unique bonding of indole to a metal ion has been established. Two new tridentate N ligands with pendent ring gave CuI complexes 1 and 2, the latter which exhibits form between in distorted tetrahedral geometry C(2)−C(3) moiety. The bond is dependent upon length side chain therefore accessibility center.

Abstract Noncovalent or weak interactions play important roles in molecular recognition and structual organization chemical biological systems. Hydrogen bonding aromatic ring stacking are widely recognized for biomolecules, these other types of recently attracting much attention as a clue to understanding the efficiency specificity reactions. We studied around metal center factors mixed ligand (ternary) complex formation, recognition, construction self-organized structures by potentiometric,...