Oxidoalkoxidovanadium(V) complexes: synthesis, characterization and comparison of X-ray crystal structures

Sutradhar, M., Barman, T. R., Mukherjee, G., Drew, M. G. B. and Ghosh, S. (2012) Oxidoalkoxidovanadium(V) complexes: synthesis, characterization and comparison of X-ray crystal structures. Polyhedron, 34 (1). pp. 92-101. ISSN 0277-5387 doi: 10.1016/j.poly.2011.12.022

Abstract/Summary

The reaction of VO(acac)(2) with the ONO-chelator obtained by the condensation of salicylaldehyde with 2-hydroxybenzoylhydrazine (H2L) in a monohydric alcohol. (ROH) medium produces VO(OR)L]-type oxidoalkoxido complexes (1-7) where R = Me, Pr-n, Pr-i, Bu-n, Bu-i, Bu-t and (n)Pen. All the complexes show the metal atom to have a five-coordinate square pyramidal environment, although in some complexes there is an additional weak V center dot center dot center dot O interaction in the sixth axial position. In acetonitrile medium and in the presence of a cis-diol (ethylene glycol), H2L reacts with VO(acac)(2) to form a six-coordinate complex, [VO(OCH2CH2OH)L] (8). When the reaction is carried out in acetonitrile medium in the presence of 2-amino ethanol, a completely different type of product containing the square pyramidal complex anion [VO2L](-) associated with the cation [NH3CH2CH2OH](+) is obtained. It was noted previously that on being reacted with monodentate nitrogen donor bases B (which are stronger than pyridine), the [VO(OR)L] complexes react to form the same complex anion [VO2L](-) associated with the corresponding cation [BH](+). The coordination environment around the V(V) acceptor center of the water soluble [BH](+)[VO2L](-)satisfies one of the several requirements for an efficient antidiabetic vanadium species such as water solubility, nature of donor atoms of the ligand and their disposition around the VO2+ acceptor center.

Item Type	Article
URI	https://reading-clone.eprints-hosting.org/id/eprint/30378
Item Type	Article
Refereed	Yes
Divisions	Life Sciences > School of Chemistry, Food and Pharmacy > Department of Chemistry
Uncontrolled Keywords	Oxidovanadium(V); N,O donor ligand; X-ray crystal structures; Cyclic voltammogram
Publisher	Elsevier
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