Vanadium(III) complexes with VN3O3 co-ordination by sexidentate schiff-base ligands: synthesis, spectra and redox activity

Ramesh, Krishnamoorthi ; Mukherjee, Rabindra Nath (1991) Vanadium(III) complexes with VN3O3 co-ordination by sexidentate schiff-base ligands: synthesis, spectra and redox activity Journal of the Chemical Society, Dalton Transactions (12). pp. 3259-3262. ISSN 0300-9246

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Official URL: http://pubs.rsc.org/en/Content/ArticleLanding/1991...

Related URL: http://dx.doi.org/10.1039/DT9910003259

Abstract

A group of non-electrolytic red crystalline vanadium(III) complexes (μeff 2.78-2.89 in solution, 298 K) has been synthesized using sexidentate Schiff-base ligands. The complexes have a rare VN3O3 co-ordination sphere. From the paramagnetically shifted 1H NMR spectra it is revealed that the metal co-ordination environment is distorted (≈C1) due to the spatial arrangement of the ligand chelate rings. In N,N-dimethylformamide (dmf) solution charge-transfer band(s) together with crystal-field transitions are observed in the region ca. 340-600 nm. Cyclic voltammetric experiments in dmf solution at a platinum electrode reveal a quasi-reversible VIII-VII couple [Ef-1.34 to -1.52 V vs. saturated calomel electrode (SCE)] and a reversible VIV-VIII couple (Ef+0.21 to +0.54 V vs. SCE).

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