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

The reaction of 4-iodobenzenesulfonamide or 4-fluorobenzenesulfonamide with CS(2) and KOH in dimethylformamide yielded the potassium N-R-sulfonyldithiocarbimates, K(2)(RSO(2)N = CS(2)) [R = 4-]C(6)H(4) (1) and 4-FC(6)H(4) (2)]. These salts reacted with K(2)[PtCl(4)] in water/methanol to yield complex anions bis(N-R-sulfonyldithiocarbimato)platinate(II), which were isolated as their tetrabutylammonium salts, (Bu(4)N)(2)[Pt(RSO(2)N = CS(2))(2)] [R = 4-IC(6)H(4) (3) and 4-FC(6)H(4) (4)]. The structures of 2-4 were determined by X-ray crystallography. The Pt(2+) in both complexes 3 and 4 lies at the inversion centre and the PtS(4) moiety has a distorted square-planar configuration. The compounds were also characterized by IR,(1)H NMR and (13)C NMR spectroscopies, and elemental analyses. The molar conductance data are consistent with the fact that 3 and 4 are dianionic complexes. (C) 2008 Elsevier Ltd. All rights reserved.