Organotin Diphenylmonothiophosphinates - Crystal-structure of Bis(diphenylmonothiophosphinato) Dimethyltin(iv), Me2sn(ospph2)2

Organotin(IV) diphenylmonothiophosphinates, RnSn(OSPPh2)4-n (R = Me, (n)Bu, Bz, Ph, Cy; n = 2 and 3) have been synthesized in good yields by reactions of organotin halides with ammonium diphenylmonothiophosphinate. The compounds have been characterized by infrared and NMR spectra, and two representative compounds were also studied by Sn-119m-Mossbauer spectroscopy. The structure of bis(diphenylmonothiophosphinato)dimethyltin(IV), Me2Sn(OSPPh2)2, has been determined by X-ray diffraction which shows that weak Sn ... S interactions give rise to a polymeric chain structure in which the tin atom exhibits a trigonal bipyramidal geometry. The ligand is attached primarily to tin through oxygen atoms.