Ni(II), Pd(II) and Cu(II) complexes with N-(dialkylthiocarbamoyl)-N′-picolylbenzamidines: Structure and activity against human MCF-7 breast cancer cells
作者:Hung Huy Nguyen、Canh Dinh Le、Chien Thang Pham、Thi Nguyet Trieu、Adelheid Hagenbach、Ulrich Abram
DOI:10.1016/j.poly.2012.08.088
日期:2012.11
N-(Dialkylthiocarbamoyl)-N'-picolylbenzamidines (HLEt and HLMorph) react with NiCl2, CuCl2 and [PdCl2(MeCN)(2)] with the formation of complexes of the general composition [M(L-R)Cl] (M = Ni (1), Pd (2)) and the dimeric complexes [Cu(L-R)Cl}(2)] (3). The molecular structures of complexes 1 and 2 exhibit a square-planar coordination sphere, in which the organic ligands coordinate in a S,N,N coordination mode. The two subunits of 3, the arrangement of each is similar to those of 1 and 2, are connected via two weak Cu-Cl' bonds. The copper complexes [(Cu(L-R)Cl)(2)] (3) are slowly oxidized under aerobic conditions to give [Cu(*L-R)Cl)(2)] complexes (4), where H*L-R = N-(dialkylthiocarbamoyl)-N'-picolinoyl-benzamidines. Complexes 1 and 2 show a very weak reduction of the growth of human MCF-7 breast cancer cells. Complexes 4, however, possess a remarkable cytotoxicity with IC50 values within the range 0.40-1.05 mu M. Compounds 3 are likely converted to 4 under the conditions of the cytotoxicity assay, and consequently exhibit IC50 values very similar to those found for 4. (C) 2012 Elsevier Ltd. All rights reserved.