Abstract
Oxovanadium(iv,v) complexes having O 4 N coordination environment have been synthesized in the solid state, formulated as M[VO 2 (L/L',/L)(H 2 O)], where M = K or NH 4 ; H 2 (L/L'/L) is the Schiff base ligand, obtained by condensation of salicylaldehyde with 2-picoloyl (L), 2-quinoloyl (L'), 8-quinoloyl (L) hydrazides. Dimeric complexes having the formulation [(VOL) 2 μ-O] have also been synthesized. Both the salicylidene-picoloyl hydrazone and the salicylidene-2-quinoloyl hydrazone ligands, in their dideprotonated form, coordinate to both vanadium in its +4 and +5 slate, through 0, N, O donor atoms, while, the ligand H 2 will act as a NNO donor ligand. Thus, in the dioxo vanadium complexes with the ligands L and L', the central vanadium core will have the O 4 N environment, which can be treated as a model to mimic the active site of vanadium haloperoxidases.
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