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KMID : 1059519890330030281
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Journal of the Korean Chemical Society
1989 Volume.33 No. 3 p.281 ~ p.286
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Electrochemical Behavior of Oxovanadium (IV) Complex of Benzohydroxamic Acid
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Choo Hi-Sik
Park Deog-Su
Shim Yon-Bo
Choi Sung-Nak
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Abstract
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The redox properties of benzophydroxamic acid (Hben) and its oxovanadium complex, VO(ben)2 has been studied by the use of polarograpy and cyclic voltammetry. The radical anions of Hben seem to be generated in acetone. The wave at -0.05V vs. Ag/AgCl electrode might be attributed to the formation of radical anion and the wave at -1.78V vs. Ag/AgCl electrode might be attributed the formation of radical dianion. The VO(ben)2 exhibits one oxidation wave at + 0.55V and two reduction waves at -0.15V and -1.30V vs. Ag/AgCl electrode; the oxidation is reversible one electron process (VO(ben)2 ↔ VO(ben)2+ + e). The reduction wave at -0.15V is quasireversible and is arised from the formation of radical anion,VO(ben)2-. The second reduction wave at -1.30V is irreversible and this reduction process produces vanadium(Ⅲ). This oxygen containing ligand of Hben seems to reduce the stability of + 4 oxidation state of vanadium while the sulfur or nitrogen donor of the ligands stabilize the + 4 oxidation state of vanadium when comparisons are made among several oxovanadium complexes.
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