2013. 54, 3 – UDC 548.73:541.49:546.88 CRYSTAL STRUCTURES OF NEW ISOSTRUCTURAL OXOVANADIUM(V) COMPLEXES WITH HYDRAZONE LIGANDS J. Yu College of Biological and Chemical Sciences Engineering, Jiaxing University, Jiaxing P. R. China E-mail: JXXYYuJ@yahoo.cn Received February, 1, 2012 Two new isostructural methoxide-bridged dimeric oxovanadium(V) complexes [VO(L1)(OMe)]2 (1) and [VO(L2)(OMe)]2 (2), where L1 and L2 are the deprotonated forms of 3-bromo-N-[1-(2hydroxyphenyl)ethylidene]benzohydrazide (H2L1) and 3-chloro-N-[1-(2-hydroxyphenyl)ethylidene]benzohydrazide (H2L2) respectively, are synthesized and characterized by elemental analyses, IR spectra, and single crystal X-ray determination. <...> Both crystals crystallize in the triclinic space group P-1. <...> Each V atom in the complexes is octahedrally coordinated. <...> INTRODUCTION Oxovanadium complexes with multi-dentate ligands have been extensively investigated in recent years with respect to their remarkable efficiency as insulin mimetic compounds [ 1—3]. <...> In recent years, a number of oxovanadium complexes with hydrazones have been reported for their insulin mimetic properties [ 8, 9 ]. <...> As an extension work on the construction of new oxovanadium complexes with potential insulin mimetic properties, two isostructural oxovanadium(V) complexes derived from the similar hydrazone ligands 3-bromo-N-[1-(2-hydroxyphenyl)ethylidene]benzohydrazide (H2L1; Scheme 1) and 3-chloro-N-[1-(2-hydroxyphenyl)ethylidene]benzohydrazide (H2L2; Scheme 1) were synthesized and characterized. . 528 – 532 Scheme 1. <...> EXPERIMENTAL Materials and methods. 1-(2-Hydroxyphenyl)ethanone, 3-bromobenzohydrazide, and 3-chlorobenzohydrazide were obtained from Lancaster. <...> The suitable single crystals of the complexes were carefully selected under a polarizing microscope and glued at the top of thin glass fibers for data collection performed on H2L1, but with 3-bromobenzohydrazide replaced by 3-chlorobenzohydrazide (0.186 g, 1 mmol). <...> VO(acac)2 (52.6 mg, 0.2 mmol) dissolved in 10 ml of methanol was added dropwise to a methanol solution of H2L1 (66.6 mg, 0.2 mmol) with continuous stirring for 30 min to give a reddish-brown solution. <...> Evaporation of the solution at room temperature yielded deep brown block-shaped single crystals after a few days. <...> The preparation of deep brown block-shaped single crystals phenyl <...>