Preparation and structural characterization of hetero-dinuclear Schiff base copper(II)-zinc(II) complexes and their inhibition studies on Helicobacter pylori urease

A series of hetero-dinuclear Cu-II-Zn-II complexes, [CuZnCl2L1] (1), [CuZnCl2L2] (2), [CuZnBr2L3] (3), [CuZnBr2L4(DMF)] (4), [CuZnCl2L4] (5), [CuZnCl2L5] (6), [CuZnCl2L3] (7) and [CuZnBr2L1] (8), where L-3, L-4 and L-5 are the deprotonated forms of N,N'-bis(3-ethoxysalicylidene)-1,3-propanediamine (H2L1), N,N'-bis(2-hydroxynaphthylmethylidene)-1,3-propanediamine (H2L2), N,N'-bis(3-methoxysalicylidene)-1,3-propanediamine (H2L3), N,N'-bis(salicylidene)-1,3-propanediamine (H2L4) and N,N'-bis(salicylidene)1,4-butanediamine (H2L5), respectively, have been synthesized and characterized by physico-chemical methods and single-crystal X-ray diffraction. The complexes were tested for their urease inhibitory activity. Complexes 1 and 8 show effective urease inhibitory activity with IC50 values of 2.2 and 10.7 mu M. The molecular docking study of the complexes with the Helicobacter pylori urease was performed. (C) 2011 Elsevier Ltd. All rights reserved.