Department of Chemistry, Victoria Institution (College), 78/B, A. P. C. Road, Calcutta-700 009, India Department of Chemistry, R. K. Mission V. C. College, Rahara-743 186, 24-Parganas (North), India Manuscript received 31 May 1999, accepted 28 August 1999 The reaction of VIVO(L)(H2O) (where L = tridentate dinegative ONO donor azo ligands) with ethane-1,2-diol (H2ed) in metha­nol solution produces the complex VVO(L) (Hed) (in which H2ed coordinates in a monodeprotonated fashion) via aerial

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... tion. f he coordination sphere of the complexes is of the VO(ONO)(OO) type, where O atoms ale of oxo, phenolic, alco­holic and carboxylic and N is of azo type. The complexes are diamagnetic and exhibit only one ligand-to-metal charge transfer (LMCT) transition near 490 nm in addition to other two intra-ligand transitions around 410 and 330 nm. The complexes have low V(V)/V(IV) reduction potentials in the region —0.40 V vs SCE leading to the stabilisation of pentavalent state.