A study of [Au(ethylenediamine)Cl₂]Cl interaction with L-methionine and DL-seleno-methionine by ¹H and ¹³C NMR spectroscopy

Article type: Research Article

Authors: Al-Maythalony, Bassem A. | Wazeer, Mohamed I.M. | Isab, Anvarhusein A.^; | Ahmad, Saeed

Affiliations: Department of Chemistry, King Fahd University of Petroleum and Minerals, Dhahran, Saudi Arabia | Department of Chemistry, University of Engineering and Technology, Lahore, Pakistan

Note: [] Corresponding author: Anvarhusein A. Isab, Department of Chemistry, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia. Fax: +966 3 860 4277; E-mail: aisab@kfupm.edu.sa.

Abstract: The interaction of [Au(en)Cl2]Cl with L-methionine (Met) and DL-seleno-methionine (Se-Met) was carried out in D2O solution at ~pH 3.8. 13C NMR spectra were interpreted by comparison with the spectra recorded after the reaction of Met or Se-Met with HAuCl4 and also after oxidation by H2O2. Reactions of [Au(en)Cl2]Cl with Met and Se-Met were found to proceed through the exchange of chloride ligands from complex with Met or Se-Met. Gold(III) reduction takes place during the reaction and en ligand was released from [Au(en)Cl2]Cl complex.

Keywords: L-methionine, DL-seleno-methionine, NMR spectroscopy

DOI: 10.3233/SPE-2010-0478

Journal: Spectroscopy, vol. 24, no. 5, pp. 567-575, 2010