Synthesis and cytotoxicity of new Pt(IV) complexes of 2,2′-biimidazole and derivatives
摘要:
Compounds of type [PtCl4(LL)] [LL = 2,2'-biimidazole (H(2)bim); N-methyl-2,2'-biimidazole (MeHbim); N-hydroxyethyl-2,2'-biimidazole (HOEtHbim); or N,N'-dimethyl-2,2'-biimidazole (Me(2)bim)] were prepared and characterized. The structure of [PtCl4(Me(2)bim)] was determined by X-ray diffractometry. The crystal consists of discrete [PtCl4(Me(2)bim)] units in which the Pt atom is coordinated to the four Cl atoms and to the unmethylated N atoms in a distorted octahedral environment. Spectroscopic data suggest that all the other complexes have similar structures. The complexes of H(2)bim, MeHbim and Me(2)bim showed cytotoxic activity against both human ovarian carcinoma A2780 and the corresponding cisplatin-resistant line, A2780cis. (c) 2005 Elsevier Ltd. All rights reserved.