ANTIMONY(III) AND PHENYLANTIMONY(III) DIMETHYLDITHIOARSINATES - SYNTHESIS AND MASS-SPECTRAL STUDY - CRYSTAL-STRUCTURE OF PH2SBS2ASME2, THE 1ST COORDINATION POLYMER ASSOCIATED VIA BRIDGING DIMETHYLDITHIOARSINATE LIGANDS

Antimony(III) and phenylantimony(III) dimethyldithioarsinates, Ph(n)Sb (S2AsMe2)3-n with n = 0-2, have been prepared and characterized by the ir IR and FAB mass spectra and the structure of Ph2SbS2AsMe2 has been determined by a single crystal X-ray diffraction study. The Ph2SbS2AsM e2 molecular units are associated into a polymeric chain via S-AsMe2-S bridging ligands, which connect approximately square pyramidal SbPh2S 2 units, essentially equal As-S interatomic distances (2.146 and 2.124 angstrom). A four-membered SbS2As chelate ring is formed with short c ovalent (2.655 angstrom and long, semibonding (3.65 angstrom) antimony -sulfur contacts. The molecular units are interconnected by relatively short (2.830 angstrom) antimony-sulfur bonds to form a polymeric chai n.