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EPR and potentiometric reinvestigation of copper(II) complexation with simple oligopeptides and related compounds

Sóvágó, Imre and Sanna, Daniele and Dessì, Alessandro and Várnagy, Katalin and Micera, Giovanni (1996) EPR and potentiometric reinvestigation of copper(II) complexation with simple oligopeptides and related compounds. Journal of Inorganic Biochemistry, Vol. 63 (2), p. 99-117. ISSN 0162-0134. Article.

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DOI: 10.1016/0162-0134(95)00185-9

Abstract

The coordination modes of Cu(II) to Di-, Tri-, and Tetra-glycine and related ligands were investigated, within the entire measurable pH range and over a wide range of ligand excess, by means of electron paramagnetic resonance, electron spectroscopy, and in some cases, pH potentiometry. The results, besides allowing the identification of the complex species involved and the attribution of distinctive spectral data set to the various structures, provide significant insight in relation to: i) the coordination ability of the zwitterionic AH form of simple oligopeptides to yield COO-- or 2COO--complexes or species with mixed [(NH2, CO)(COO-)] or [(NH2, N-, COO-)(COO-)] coordination; ii) the influence of the size of the (NH2, CO), (NH2, N-), and (N-, COO-) chelated rings on the stability and structure of the complex species; iii) the bis-complex formation processes taking place with Gly-β-ala, β-Alagly, Tri-, and Tetraglycine.

Item Type:Article
ID Code:1435
Status:Published
Refereed:Yes
Uncontrolled Keywords:EPR, copper(II), oligopeptides
Subjects:Area 03 - Scienze chimiche > CHIM/03 Chimica generale e inorganica
Divisions:001 Università di Sassari > 01 Dipartimenti > Chimica
002 Altri enti e centri di ricerca del Nord Sardegna > CNR-Consiglio Nazionale delle Ricerche > Istituto di chimica biomolecolare, Sassari
Publisher:Elsevier Science
ISSN:0162-0134
Additional Information:Pubblicato online il 25 maggio 1999.
Deposited On:18 Aug 2009 10:05

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