HYDROGEN-BOND DIRECTED PREPARATION AND STRUCTURES OF DIOXOV ANADIUM COMPLEXES WITH TRIDENTATE SCHIFF BASES

Abstract

ABSTRACT Two new dimeric dioxovanadium complexes, [VO 2 L 1 ] 2 ( 1 ) and [VO 2 L 2 ] 2 ( 2 ), where L 1 and L 2 are the deprotonated forms of the tridentate Schiff bases 2-[(2-isopropylaminoethylimino)methyl]-4-nitrophenol (HL 1 ) and 4-bromo-2-[(2-isopropylaminoethylimino)methyl]phenol (HL 2 ), respectively, have been synthesized and characterized by i.r., UV-Vis spectra and single crystal X-ray diffraction. There form two N–H···O hydrogen bonds between two [VO 2 L] moieties in each complex. The V atom in each complex is coordinated by the three donor atoms of the tridentate Schiff base ligand, and three oxo O atoms, forming an octahedral coordination. Keywords: Synthesis; dioxovanadium complex; Schiff base; crystal structure; hydrogen bond. e-mail: huhuanan2012@yahoo.cn INTRODUCTION In recent years, much attention has been focused on the Schiff bases and their complexes in the fields of coordination chemistry and biological chemistry. 1-3 Vanadium compounds present innumerous pharmacological applications as antitumorals, antimicrobials and insulin-mimics.