Potentiometric and spectroscopic studies of transition metal complexes of bis(imidazolyl) and bis(pyridyl) derivatives of amino acids

Copper(II) and zinc(II) complexes of H-Gly-BIMA (glycinamido-bis(imidazol-2-yl)methane) and copper(II), nickel(II), cobalt(II) and zinc(II) complexes of Prodipa (prolineamido-bis(pyridin-2-yl)methane) were studied by potentiometry, electron paramagnetic resonance and visible spectroscopy. The data r...

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Published inInorganica Chimica Acta Vol. 283; no. 1; pp. 233 - 242
Main Authors Várnagy, Katalin, Sóvágó, Imre, Goll, Wolfgang, Süli-Vargha, Helga, Micera, Giovanni, Sanna, Daniele
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.12.1998
Subjects
Amino acid derivative complexes
Electrochemistry
Transition metal complexes
Electrochemistry
Transition metal complexes
Amino acid derivative complexes
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Abstract Copper(II) and zinc(II) complexes of H-Gly-BIMA (glycinamido-bis(imidazol-2-yl)methane) and copper(II), nickel(II), cobalt(II) and zinc(II) complexes of Prodipa (prolineamido-bis(pyridin-2-yl)methane) were studied by potentiometry, electron paramagnetic resonance and visible spectroscopy. The data revealed that both ligands are ambidentate. Imidazole and pyridine nitrogens of H-Gly-BIMA and Prodipa, respectively, are the exclusive binding sites in acidic media, but the metal binding ability of the bis(imidazolyl) residue is much higher than that of the bis(pyridyl) ligand. The coordination of the amino, amide and imidazole/pyridine nitrogens was concluded around physiological pH, which resulted in the formation of an imidazole bridged dimeric species in the case of H-Gly-BIMA.
AbstractList Copper(II) and zinc(II) complexes of H-Gly-BIMA (glycinamido-bis(imidazol-2-yl)methane) and copper(II), nickel(II), cobalt(II) and zinc(II) complexes of Prodipa (prolineamido-bis(pyridin-2-yl)methane) were studied by potentiometry, electron paramagnetic resonance and visible spectroscopy. The data revealed that both ligands are ambidentate. Imidazole and pyridine nitrogens of H-Gly-BIMA and Prodipa, respectively, are the exclusive binding sites in acidic media, but the metal binding ability of the bis(imidazolyl) residue is much higher than that of the bis(pyridyl) ligand. The coordination of the amino, amide and imidazole/pyridine nitrogens was concluded around physiological pH, which resulted in the formation of an imidazole bridged dimeric species in the case of H-Gly-BIMA.
Author Várnagy, Katalin
Goll, Wolfgang
Süli-Vargha, Helga
Sóvágó, Imre
Sanna, Daniele
Micera, Giovanni
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  givenname: Daniele
  surname: Sanna
  fullname: Sanna, Daniele
  organization: Department of Chemistry, University of Sassari, I-07100 Sassari, Italy
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Keywords Electrochemistry
Transition metal complexes
Amino acid derivative complexes
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Snippet Copper(II) and zinc(II) complexes of H-Gly-BIMA (glycinamido-bis(imidazol-2-yl)methane) and copper(II), nickel(II), cobalt(II) and zinc(II) complexes of...
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StartPage 233
SubjectTerms Amino acid derivative complexes
Electrochemistry
Transition metal complexes
Title Potentiometric and spectroscopic studies of transition metal complexes of bis(imidazolyl) and bis(pyridyl) derivatives of amino acids
URI https://dx.doi.org/10.1016/S0020-1693(98)00230-8
Volume 283
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