Please use this identifier to cite or link to this item: http://ktisis.cut.ac.cy/handle/10488/6395
Title: PH-potentiometric investigation towards chelating tendencies of p -hydroquinone and phenol iminodiacetate copper(II) complexes
Authors: Stylianou, Marios 
Keramidas, Anastasios D. 
Drouza, Chryssoula 
Keywords: Complexes
Phenol
Proteins
Enzymes
Copper ions
Potentiometry
Issue Date: 2010
Publisher: Hindawi Publishing Corporation
Source: Bioinorganic chemistry and applications, 2010, volume 2010, article number 125717
Abstract: Copper ions in the active sites of several proteins/enzymes interact with phenols and quinones, and this interaction is associated to the reactivity of the enzymes. In this study the speciation of the Cu 2+ with iminodiacetic phenolate/hydroquinonate ligands has been examined by pH-potentiometry. The results reveal that the iminodiacetic phenol ligand forms mononuclear complexes with Cu 2+ at acidic and alkaline pHs, and a binuclear O phenolate -bridged complex at pH range from 7 to 8.5. The binucleating hydroquinone ligand forms only 2:1 metal to ligand complexes in solution. The pK values of the protonation of the phenolate oxygen of the two ligands are reduced about 2 units after complexation with the metal ion and are close to the pK values for the copper-interacting tyrosine phenol oxygen in copper enzymes
URI: http://ktisis.cut.ac.cy/handle/10488/6395
ISSN: 15653633
DOI: 10.1155/2010/125717
Rights: Copyright © 2010 Marios Stylianou et al
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