Abstract
Mixed ligand, monooxovanadium(V) complexes of Schiff bases with catechol, p-tertbutylcatechol or pyrogallol have been synthesized and characterized by various spectral techniques, such as FTIR, UV-vis, 51V NMR and electrochemistry. All of these complexes exhibited a six coordinated VO 3+ center. The stability and the conversion of these complexes to pentacoordinated VO 2 + species with the loss of a bidentate catecholate ligand in DMSO were demonstrated using absorption, 51V NMR and electrochemical studies. 51V NMR studies further suggested the formation of two possible isomers in the case of p-tertbutylcatechol and pyrogallol complexes of VO 3+. Electrochemistry of these complexes showed one reversible V(V)/V(IV) couple and another irreversible V(IV)/V(11I) response. The mixed ligand, VO 3+ complexes are more resistant to reduction as compared to the corresponding tris catecholate complexes.
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