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Global Journal of Inorganic Chemistry. Volume 2, Issue 3 (2011) pp. 203-218
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Review Article
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Benzoyl hydrazones of 2-hydroxyacetophenone family as versatile tridentate ligands for oxovanadium(V)
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Tapas Ghosh
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Post Graduate Department of Chemistry, Ramakrishna Mission Vivekananda Centenary College,
P. O. – Rahara, Kolkata – 700118, India
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Abstract |
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[VIVO(acac)2], on reaction with equimolar
amount of benzoyl hydrazone
of 2-hydroxyacetophenone and its
5-substituted derivatives (containing two intermediate basic phenolic and amide
moieties along with a neutral imine moiety) afforded
mainly oxovanadium(V) complexes with VO3+,
V2O34+ and VO2+ motifs
depending upon the reaction medium (i.e., nature of the solvent e.g., hydroxylic or non-hydroxylic) and
also its pH via aerial oxidation. The oxovanadium(IV)
complexes were only been obtained in mixed-ligand system in presence of
2,2′-bipyridine or 1,10-phenanthroline (a typical neutral NN donor
ligand) as coligand, which have appreciable stability
in the solid state but are not very stable in solution. Complexes with VO3+,
V2O34+ and VO2+ motifs
are interconvertible.
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Keywords |
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Oxovanadium(IV) complexes; Oxovanadium(V) complexes; Dioxovanadium(V) complexes; Mixed-ligand complexes; Hydrazone complexes
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