Syntheses, crystal structure and spectroscopic characterization of new platinum(II) dithiocarbimato complexes

The reaction of 4-iodobenzenesulfonamide or 4-fluorobenzenesulfonamide with CS2 and KOH in dimethylformamide yielded the potassium N-R-sulfonyldithiocarbimates, K2(RSO2NCS2) [R = 4-IC6H4 (1) and 4-FC6H4 (2)]. These salts reacted with K2[PtCl4] in water/methanol to yield complex anions bis(N-R-sulfonyldithiocarbimato)platinate(II), which were isolated as their tetrabutylammonium salts, (Bu4N)2[Pt(RSO2NCS2)2] [R = 4-IC6H4 (3) and 4-FC6H4 (4)]. The structures of 2–4 were determined by X-ray crystallography. The Pt2+ in both complexes 3 and 4 lies at the inversion centre and the PtS4 moiety has a distorted square-planar configuration. The compounds were also characterized by IR, 1H NMR and 13C NMR spectroscopies, and elemental analyses. The molar conductance data are consistent with the fact that 3 and 4 are dianionic complexes.

Graphical abstractThree new complexes, potassium N-4-fluorophenylsulfonyldithiocarbimate dihydrate, and tetrabutylammonium bis(N-R-sulfonyldithiocarbimato)platinate(II) (R = 4-IC6H4 and 4-FC6H4), were obtained in the crystalline form. The compounds were characterized by single crystal X-ray diffraction technique, and by IR, 1H and 13C NMR spectroscopies.Figure optionsDownload full-size imageDownload as PowerPoint slide