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A new centrosymmetric dinuclear oxovanadium(V) complex, [V2O2(μ-O)2L2], was prepared by the reaction of [VO(acac)2] (where acac = acetylacetonate) with the Schiff base ligand 2-bromo-4-chloro-6-((2-(ethylamino)ethylimino)methyl)phenol (HL) in methanol. Crystal and molecular structure of the complex were determined by elemental analysis, infrared and1H NMR spectra and single-crystal X-ray diffraction. The V···V distance is 3.105(1) Å. The V atoms in the complex are in octahedral coordination, with the phenolate oxygen, imino nitrogen, and amino oxygen of the Schiff base ligand, and one bridging oxo oxygen in the equatorial plane, and with one oxo oxygen and one bridging oxo oxygen in the two axial positions. Thermal stability of the complex was studied. [ABSTRACT FROM PUBLISHER]

Two similar oxovanadium(V) complexes, [VOL1L′] (1) and [VOL2L′] (2), were prepared by the reaction of [VO(acac)2] (where acac = acetylacetonate), 8-hydroxyquinoline (HL′) withN′-(5-fluoro-2-hydroxybenzylidene)nicotinohydrazide (H2L1) andN′-(3-bromo-5-chloro-2-hydroxybenzylidene)nicotinohyrazide (H2L2), respectively, in methanol. Crystal and molecular structures of the complexes were determined by elemental analysis, infrared, and UV-vis spectra and single-crystal X-ray diffraction. The nicotinohydrazone ligands coordinate to the V atoms through the phenolate oxygen, imino nitrogen, and enolate oxygen. The 8-hydroxyquinoline ligand coordinates to the V atom through the phenolate oxygen and pyridine nitrogen. The V atoms in both complexes are in octahedral coordination. [ABSTRACT FROM PUBLISHER]