Cytotoxicity of palladium(II) complexes with some alkyl derivates of thiosalicylic acid. Crystal structure of the bis(S-butyl-thiosalicylate)palladium(II) complex, [Pd(S-bu-thiosal)2]

The spectroscopically predicted structure of the obtained bis(S-butyl-thiosalicylate)palladium(II) complex, [Pd(S-bu-thiosal)2], was confirmed by an X-ray structural study. The asymmetric unit of [Pd(S-bu-thiosal)2] consists of neutral complex molecules, where the Pd(II) ion is placed in a cis-square-planar coordination environment formed by O and S atoms of two deprotonated S-butyl-thiosalicylic acid ligands. The cytotoxic effects of the S-alkyl (R = benzyl (L1), methyl (L2), ethyl (L3), propyl (L4) and butyl (L5)) derivatives of thiosalicylic acid and the corresponding palladium(II) complexes are reported here. The analysis of cancer cell viability showed that all the tested complexes are cytotoxic to human colon carcinoma cells (HCT-116 and CaCo-2) and human lung carcinoma epithelial cells (A549). The antitumor activities of the above mentioned Pd(II) complexes are higher in comparison to the corresponding ligands.

The molecular structure of the mononuclear complex [Pd(S-bu-thiosal)2] was determined by the single-crystal X-ray diffraction method. Although the two deprotonated S-butyl-thiosalicylic acid ligands form a symmetric cis-square-planar coordination around the Pd(II) metal atom, they show significant differences in their conformation. The cytotoxicities of the palladium(II) complexes with S-alkyl derivatives of thiosalicylic acid were significantly higher than those of their ligand precursors.Figure optionsDownload as PowerPoint slide