SYNTHESIS AND CRYSTAL-STRUCTURE OF PARASUBSTITUTED DIPHENYLSILANES OFINTEREST FOR NONLINEAR OPTICS - SULFONYL ACCEPTOR GROUPS

Donor-acceptor substituted diphenylsilanes have been synthesized becau se of their nonlinear optical properties. The crystal and molecular st ructure of disilanes having a dimethylamino donor and a sulfonyl conta ining acceptor are described for the first time. These molecules have a trans-type conformation. The geometries of the acceptors reflect the ir distinct electron-withdrawing character. Strong electron conjugatio n between the phenyl ring and the dimethylamino donor, which is almost sp2 hybridized, is indicated. The structural data form a useful basis for the analysis of molecular properties, obtained experimentally or predicted by calculations.