Abstract

R. Rajaval and C. N. Krishnan

Schiff bases amben, ambpn and ambtn were prepared by reacting 2-aminobenzaldehyde respectively with 1,2-diaminoethane, 1,2-diammopropane and 1,3-diaminopropane. The Schiff bases when reacted with vanadyl sulphate in alcoholic medium formed green/blue complexes. The metal ligand ratio of 1:1 has been arrived at by estimating the nitrogen and vanadium contents. The complexes are ionic as indicated by their conductivity in DMSO solutions. The involvement of the nitrogen atoms of the ligands in binding to the metal has been inferred from the infrared spectra. The presence of sulphate as a counter ion has also been confirmed from the infrared spectra. The cyclic voltammetric studies indicate a reversible oxidation of the vanadium in the complex to V(V). Comparison of the redox potentials and the V=0 stretching frequencies of the complexes indicates that the ambpn complexes is the most stable of these complexes.

Aminobenzaldehyde; diaminoethane voltammetric

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