Alkali metal (Na+ and K+)-mediated supramolecular assembly of oxovanadium(V) complexes: Synthesis and structural characterization.

The syntheses and characterization of alkali metal complexes [{VO2L}M(H2O)(n)] (1 and 2) [M = Na+ (1), K+ (2)] of anionic cis-dioxovanadium(V) Species (LVO2-) of the Schiff base 2-hydroxybenzoylhydrazone of 2-hydroxybenzaldehyde have been reported. The number of coordinated water molecules in [{VO2L}M(H2O)(n)] decreases as the charge density of the alkali metal ion decreases (n = 5 for Na+ and I for K+). These Compounds represented W-mediated supramolecular assembly [{VO2L)M(H2O}(n)] with an infinite polymeric structure containing an alternating array of cis-dioxo vanadium(V), [VO2L](-), units and aquated metal ion centres, as confirmed by X-ray crystallographic investigation of both. All the compounds are characterized by elemental analysis, IR, UV-Vis and NMR spectroscopy. (C) 2009 Elsevier Ltd. All rights reserved.