Abstract
New palladium complexes of chloroquine (CQ) and clotrimazole (CTZ) have been prepared, characterized, and evaluated against four tumor cell lines in vitro. [Pd (CQ) 2Cl 2] ( 1) was synthesized by the reaction of PdCl 2(CH 3CN) 2 with CQ, and the [Pd (CTZ) 2Cl 2] ( 2) complex by a similar reaction. The new compounds were characterized by a combination of FAB-MS (fast atom bombardment-mass spectrum), elemental analysis, molar conductivity, IR, and NMR spectroscopy. The solid-state structure of 2 has been determined by X-ray crystallography. 2 crystallizes in the monoclinic space group P(2 1/ c), with a = 21.100(4) Å, b = 13.408(3) Å, c = 22.642(5) Å. The structure refinement converged at R 1 = 0.0728, wR 2 = 0.1918. The cytotoxicity of these two complexes for the tumor cell lines, PANC-1, SKBR-3, MDA-MB231 and HT-29, was compared with that of the original ligands. Ligation of palladium to CTZ led to an increase in the IC 50, although a three-fold reduction in the IC 50 of CQ was observed on ligation to the metal when tested against the MDA-MB231 cell line.
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