Syntheses, spectral characterization, X-ray studies and in vitro cytotoxic activities of triorganotin(IV) derivatives of p-substituted N-methylbenzylaminedithiocarbamates

Abstract Two new organotin(IV) complexes of the type R 3 SnL, where (L =  p -bromo- N -methylbenzylaminedithiocarbamate and p -fluoro- N -methylbenzylaminedithiocarbamate, and R = phenyl) have been synthesized in 1:1 molar ratio with good yields and isolated as crystalline solids. The newly synthesized compounds gave fairly sharp melting points indicating that the compounds were pure. A systematic investigation of the derivatives were carried out both in solid and in solution and were suitably characterized by elemental analysis, FT-IR, 1 H, 13 C, 119 Sn NMR spectroscopies. The dithiocarbamate ligands chelated to the tin metal monodentately using only one sulfur atom showing a pair of bands due to ν(C S) below 1000 cm −1 . This phenomenon was supported by the occurrence of new medium to weak absorptions in the region 411–545, in the spectra of complexes, assigned to ν(Sn S) and ν(Sn C). The crystal structures of the two triorganotin(IV) complexes have been determined by X-ray crystallography. Both the complexes crystallized in the monoclinic, P 2(1)/ n space group. The spectral investigations and single crystal X-ray diffraction data illustrate that the two dithiocarbamato ligands in the triphenyltin(IV) derivatives 1 and 2 are monodentate and the geometry at tin is best described as a distorted tetrahedron. The in vitro antiproliferative tests of these two derivatives on three human cell lines, leukemic lymphoblastoma Jurkat cells, lymphoblastoma K-562 cells, hepatoblastoma HepG2 cells and one mouse fibroblast cells L929 show dose-dependent decrease of cell proliferation in all cell lines.