Cadmium complexes and cocrystals of indium complexes of benzothiazole derivatives and anticancer activities of the cadmium complexes
摘要:
Cadmium and indium complexes [Cd(L-1)(O2CCH3)(2)(H2O)] (1) [Cd(L-2)(2)(O2CCH3)(2)(H2O)] (2), [(LIn)-In-1(H2O)Cl-3]center dot L-1 (3) and [(LIn)-In-1(MeOH)Cl-3]center dot L-1 (4) (where L-1 = 2-(pyridin-2-yl)benzo[d]thiazole and L-2 = 2-(pyridin-4-yl)benzo[d]thiazole) are synthesized and characterized. The cadmium complex 1 is hexa-coordinated in which L-1 act as N,N-chelate. The two acetate ligands of the complex bind to cadmium in monodentate and bidentate fashion. In the complex 2, the ligand L-2 binds to cadmium ion through the nitrogen atom of the pyridine ring. The indium complexes 3 and 4 are hexa-coordinated; each has one L-1 as chelating ligand and another L-1 as molecule of crystallization. Fluorescence study revealed that the ligand L-1 can detect indium(III) ions in the presence of cadmium(II) ions. In cell-based cytotoxicity assays, the ligands are biologically inactive, while the cadmium complexes 1 and 2 are cytotoxic in pancreatic cancer cell lines Mia Paca-2, BxPC-3 and Panc-1, with IC50 values as low as 16.0 mu M. (C) 2013 Elsevier Ltd. All rights reserved.