Synthesis and spectroscopic characterization of dimethyl/di(n-butyl)tin(IV)bis(O,O′-ditolyl dithiophosphate) complexes. Crystal structures of Me2Sn[S2P(OC6H4Me-o)2]2 and n-Bu2Sn[S2P(OC6H4Me-o)2]2

Organotin(IV) complexes of the type, R2Sn[S2P(OR′)2]2 (where R = Me, n‐Bu and R′ = o‐, m‐, p‐C6H4Me) have been obtained by the reaction of Me2SnCl2 or n‐Bu2SnCl2 with ammonium salts of the corresponding O,O′‐ditolyl dithiophosphates on stirring in benzene and have been characterized by elemental analysis and IR, 1H, 13C, 31P and 119Sn NMR spectroscopy. Trends in data are discussed. The crystal structures of Me2Sn[S2P(OC6H4Me‐o)2]2 and n‐Bu2Sn[S2P(OC6H4Me‐o)2]2 are reported. The environment around the tin atom in both molecules may be described as having skew‐trapezoid bipyramidal geometry. Copyright © 2007 John Wiley & Sons, Ltd. Organotin(IV) complexes of the type, R2Sn[S2P(OR′)2]2 (where R = Me, Bu and R′ = o‐, m‐, p‐C6H4Me) were obtained by the reaction of Me2SnCl2 or Bu2SnCl2 with ammonium salts of the corresponding O, O′‐ditolyl dithiophosphates. Crystal structures for Me2Sn[S2P(OC6H4Me‐o)2]2 and Bu2Sn[S2P(OC6H4Me‐o)2]2 were determined. The geometry around the tin atom in both molecules may be described as having skew‐trapezoid bipyramidal geometry.