Collect. Czech. Chem. Commun. 1989, 54, 53-63

Electroanalytical chemistry of vanadium complexes. Comparison of the voltammetric features of amavadine with those of the vanadium complexes with iminodiacetic acid and methyliminodiacetic acid

Roland Meiera, Harald Frankb, Reinhard Kirmseb, Reiner Salzerb, Joachim Stachb, Gerhard Wernerb and Matthias Ottoc

a Department of Natural Sciences, Technical University of Leipzig, P.O. Box 66, 7030 Leipzig, G.D.R.
b Department of Chemistry, Karl Marx University Leipzig, 7010 Leipzig, G.D.R.
c Department of Chemistry, Bergakademie Freiberg, 9200 Freiberg, G.D.R.


The voltammetric behaviour of amavadine (AV) was found to be considerably different from that of the complexes of VO2+ with methyliminodiacetic acid (MIDA) and iminodiacetic acid (IDA). To get an insight in the rather complicated reduction mechanism of the latter complexes the reductions of V(III) (MIDA) and V(III) (IDA) have been studied for comparison. The species V(III) (MIDA)2 and V(III) (IDA)2 are reduced to the appropriate V(II) complexes in a chemically reversible process. VO(MIDA)2 and VO(IDA)2 are reduced to the same complexes via an ECE mechanism. The investigation of the electroreduction of AV shows that this process is not reversible in the chemical sense. As a probable explanation, the conclusion was drawn that AV and the usual V(IV)O-iminocarboxylato complexes differ in their structures.