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Spectroscopy
Volume 19, 5,6, Pages 275-281
http://dx.doi.org/10.1155/2005/850959

A 13C NMR study of the interactions of Ag13CN and Ag(CN)2 with thiomalic acid, L-methionine and DL-selenomethionine

Anvarhusein A. Isab and Mohamed I. M. Wazeer

Contribution from Department of Chemistry, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia

Copyright © 2005 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Complexation of Ag+ as AgNO3, solid AgCN and Ag(CN)2 by labeled and unlabeled L-methionine, DL-selenomethionine and d,l-thiomalate were studied by nuclear magnetic resonance methods. The 13C NMR indicates that only Ag+ react with the both L-methionine, DL-selenomethionine at neutral and higher pH via CO2 and S or Se atom forming a chelate. The Ag(CN)2 and AgCN do not bind to either of these two ligands at any pH. The Ag13CN, which is an insoluble polymer, can react with thiomalate to form chelate complexes at neutral pH. Various structures for the chelate formations are proposed.