The Infra-Red Absorption Spectra of Some Amide- and Dipeptide-Metal Chelates.

Rosenberg, Andreas; Sikkeland, T.; Moutschen-Dahmen, M.; Noer, B.; Reio, L.

doi:10.3891/acta.chem.scand.11-1390

Cited by 25 publications

(13 citation statements)

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“…The frequency of the former two bands decrease with the rise in the atomic number (Z) of the metal where the covalent character of the (MÀ ÀO) band increases along the series from 455 ± 465 cm À 1 , which is similar to the view supported by Rosenberg [32].…”

Section: Uric Acid Complexessupporting

confidence: 60%

Complexation and Thermal Studies of Uric Acid with Some Divalent and Trivalent Metal Ions of Biological Interest in the Solid State

Moawad

2002

Journal of Coordination Chemistry

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Nine new [metal : uric acid] complexes [M(Ua) n ] Á XH 2 O have been synthesized. These complexes have been characterized by elemental analysis, X-ray diraction (XRD), magnetic susceptibility ( e. ), FTIR spectra, thermal analysis (TG & DTA), and electronic spectra (UV/ visible). Uric acid (HUa) coordinates as a bidentate ligand to Mn(II), Fe(II), Co(II), Ni(II), Cu(II), Zn(II), Al(III), Cr(III) and Fe(III) through the protonated N-7 within the imidazole ring and O-6 within the pyrimidine ring. Uric acid forms neutral metal urate complexes with all the above metal ions. The quantitative compositions were determined as [M(Ua) 2 Á (H 2 O) 2 ] Á XH 2 O where M(II) Mn, Fe, Co, Ni, Cu, Zn and X 2, 4, 2, 4, 2, 2, respectively. The M(II) complexes exhibit an isostructural octahedral coordination with N-7, O-6 of two uric acid ligand molecules, and O of two water molecules. Compositions were also determined as [M(Ua) 3 ] Á YH 2 O where M(III) Al, Cr, Fe and Y 6, 3, 3 respectively. All the M(III) complexes form an isostructural octahedral coordination with N-7 and O-6 of three uric acid ligand molecules. Iron(III) complexes prepared with N 1 , N 3 and N 9 -methyl uric acid yielded brown complexes with a metal : ligand ratio of 1 : 3, while N 7 -methyl uric acid did not yield a complex due to blockage of N-7 with a methyl group.

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Section: Uric Acid Complexessupporting

confidence: 60%

Complexation and Thermal Studies of Uric Acid with Some Divalent and Trivalent Metal Ions of Biological Interest in the Solid State

Moawad

2002

Journal of Coordination Chemistry

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“…The same type of interaction seems to occur between Zn++ and cysteine (73). Manyak et al (108) confirm the finding that, in the Cu++-glycylglycine 1 : 1 complex, a proton is replaced by the metal ion, resulting in a considerable change in electronic properties of the whole molecule. The guanidinium group does not act as a chelating ligand Metal ion complexes of amino acids cannot be used directly as models for chelate formation with peptides and proteins since in these compobnds most a-amino and a-carboxyl groups are tied up in peptide bond formation.…”

Section: B Comptiexes With Substratesmentioning

confidence: 78%

Mechanism of Metal Ion Activation of Enzymes

Malmström¹,

Rosenberg²

1959

Advances in Enzymology - And Related Areas of Molecular Biology

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“…(1957) and Borchers (1959). Rising, Parker & Gaston (1934), Wenaas (1937), Manyak et al (1955, Budesinsky (1957) and Rosenberg (1957) have isolated in crystalline form copperpeptide complexes possessing this stoicheiometry. Li & Doody (1954), however, interpreted their results as implying that glycylglycine forms only a 1: 2 complex with Cu2+ ion.…”

Section: Resultsmentioning

confidence: 94%