Monooxovanadium(V) mixed ligand complexes of Schiff bases and catecholates : synthesis, spectral and electrochemical characterization

Asgedom, Gebray ; Sreedhara, Alavattam ; Rao, Chebrolu P. (1996) Monooxovanadium(V) mixed ligand complexes of Schiff bases and catecholates : synthesis, spectral and electrochemical characterization Polyhedron, 15 (21). pp. 3731-3739. ISSN 0277-5387

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Official URL: http://www.sciencedirect.com/science/article/pii/0...

Related URL: http://dx.doi.org/10.1016/0277-5387(96)00123-4

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 VO3+ center. The stability and the conversion of these complexes to pentacoordinated VO2+ 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 VO3+. Electrochemistry of these complexes showed one reversible V(V)/V(IV) couple and another irreversible V(IV)/V(11I) response. The mixed ligand, VO3+ complexes are more resistant to reduction as compared to the corresponding tris catecholate complexes.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
ID Code:79145
Deposited On:24 Jan 2012 12:10
Last Modified:19 Apr 2012 05:42

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