Synthesis, Structural and Spectral Studies of Five- and Six-Coordinate Adducts of Organotin(IV) Halides Containing Dibenzylsulfoxide (dbso) as Ligand. The Crystal Structures of fac-[MeSnCl3(dbso)(2)] and trans-[Ph2SnCl2(dbso)(2)]

摘要

The reaction of the ambidentate ligand dibenzylsulfoxide (dbso) with Me2SnCl2 in 1:1 molar ratio leads to the formation of the five-coordinate adduct [Me2SnCl2(dbso)], whereas the same reaction conditions with Ph2SnCl2 provide the six-coordinate adduct trans-[Ph2SnCl2(dbso)(2)]. On the other hand, the reaction with (Bu2SnCl2)-Bu-n forms the dimeric adduct [{(Bu2SnCl2)-Bu-n(dbso)}(2)], which probably possesses octahedral tin(IV) nuclei and bridging chlorides. The adducts [MeSnCl3(dbso)(2)] and [Ph3SnCl(dbso)] were also prepared and included in the study. All complexes were studied by microanalysis and IR, NMR (H-1, C-13 and Sn-119) and Mossbauer spectroscopies to investigate their structural properties. The six-coordinate species fac-[MeSnCl3(dbso)(2)] and trans-[Ph2SnCl2(dbso)(2)] were also studied by single crystal X-ray diffractometry. These compounds crystallize in the orthorhombic, Pbcn, and monoclinic space group P2(1)/c, respectively, as discrete neutral molecules with the tin(IV) atom in a distorted octahedral geometry and the two dbso ligands in cis and trans positions, respectively.