Spectroscopic and electrochemical characterization of some Schiff base metal complexes containing benzoin moiety.

M S El-Shahawi, M S Al-Jahdali, A S Bashammakh, A A Al-Sibaai, H M Nassef

Index: Spectrochim. Acta. A. Mol. Biomol. Spectrosc. 113 , 459-65, (2013)

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Abstract

The ligation behavior of bis-benzoin ethylenediamine (B2ED) and benzoin thiosemicarbazone (BTS) Schiff bases towards Ru(3+), Rh(3+), Pd(2+), Ni(2+) and Cu(2+) were determined. The bond length of M-N and spectrochemical parameters (10Dq, β, B and LFSE) of the complexes were evaluated. The redox characteristics of selected complexes were explored by cyclic voltammetry (CV) at Pt working electrode in non aqueous solvents. Au mesh (100 w/in.) optically transparent thin layer electrode (OTTLE) was also used for recording thin layer CV for selected Ru complex. Oxidation of some complexes occurs in a consecutive chemical reaction of an EC type mechanism. The characteristics of electron transfer process of the couples M(2+)/M(3+) and M(3+)/M(4+) (M=Ru(3+), Rh(3+)) and the stability of the complexes towards oxidation and/or reduction were assigned. The nature of the electroactive species and reduction mechanism of selected electrode couples were assigned.Copyright © 2013 The Authors. Published by Elsevier B.V. All rights reserved.