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Equilibrium and structural studies on transition metal complexes of amino acid derivatives containing the bis(pyridin-2-yl)methyl residue

Osz, Katalin and Várnagy, Katalin and Sóvágó, Imre and Lennert, Lídia and Süli-Vargha, Helga and Sanna, Daniele and Micera, Giovanni (2001) Equilibrium and structural studies on transition metal complexes of amino acid derivatives containing the bis(pyridin-2-yl)methyl residue. New Journal of Chemistry, Vol. 25 (5), p. 700-706. eISSN 1369-9261. Article.

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DOI: 10.1039/b010212l

Abstract

The stoichiometries, stability constants and structures of the complexes formed in the reaction of copper(II), nickel(II) and zinc(II) ions and N-glycylbis(pyridin-2-yl)methylamine (Gly-BPMA) and N-histidylbis(pyridin-2-yl)methylamine (His-BPMA) ligands have been determined by potentiometric, UV-VIS and EPR spectroscopic methods. The formation of four-coordinate 1:1 copper(II) complexes and octahedral mono and bis(ligand) nickel(II) and zinc(II) complexes was detected. The bis(pyridin-2-yl)methyl moiety is the main binding site in acidic media, while deprotonation and coordination of the amide nitrogen take place in the physiological pH range. The stability of the complexes of the bis(pyridin-2-yl)methyl ligands is lower than that of analogous bis(imidazol-2-yl)methyl compounds. The weaker metal binding ability of the ligands containing the bis(pyridin-2-yl)methyl group is also reflected in the fact that, in contrast with analogous bis(imidazol-2-yl)methyl ligands, the non-coordinated pyridine nitrogens cannot act as a bridge-forming polymeric species.

Item Type:Article
ID Code:1482
Status:Published
Refereed:Yes
Uncontrolled Keywords:Transition metal complexes, amino acids, bis(pyridin-2-yl)methylamine, stoichiometry
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:Royal Society of Chemistry
eISSN:1369-9261
Deposited On:18 Aug 2009 10:05

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