Synthesis and Crystal Structures of Dimeric Schiff Base Oxovanadium(V) Complexes with Antimicrobial Activity1

摘要

Two new dimeric oxovanadium(V) complexes, [VO2L~1]2 · 2H2O (I) and [VO2L~2]2 (II), where L~1 and L~2 are the monoanionic form of 5-methoxy-2-[(2-methylammoethylimino)methyl]phenol (HL~1) and 5-diethylarnino-2-[(2-memylammoethylirnino)methyl]phenol (HL~2), respectively, have been synthesized and characterized by elemental analysis, FT-IR spectra, and single crystal X-ray determination. The crystal of I is monoclinic: space group P2_1, a = 6.858(2),b = 16.630(3), c= 12.306(2) A, β = 103.985(2)°, V= 1361.9(5) A~3, Z= 2. The crystal of II is triclinic: space group P1, a = 7.378(2), b = 8.838(2), c = 13.312(3) A, α = 102.576(2)°, β = 92.044(2)°, γ= 113.017(2)°, V= 772.7(3) A~3, Z= 2. The V···V distances are 3.140(1) Ain I and 3.254(1) Ain II. The V atoms in the complexes are in octahedral coordination. The effect of the complexes on the antimicrobial activity against Staphylococcus aureus, Escherichia coli, and Candida albicans was studied.