Synthesis of .ALPHA.,.OMEGA.-Bissilanes with Fluorocarbon Chain and Surface Structures of Solid Surfaces, Modified with the Silanes.

α,ω-Bischlorosilanes, Cl3SiCH2CH2(CF2)nCH2CH2SiCl3(n=4 (I), 6 (II), or 8 (III)), were synthesized using hydrosilylation reaction with trichlorosilane of the corresponding α,ω-divinylpolyfluoroalkanes, CH2=CH(CF2)nCH=CH2(n=4, 6, or 8), in the presence of hexachloroplatinate(IV) as catalyst at 100°C. Two other α,ω-bissilanes, (CH3O)3 SiCH2CH2(CF2)nCH2CH2Si(OCH3)3(n=4 (IV), 6 (V), or 8 (VI)), and (OCN)3SiCH2CH2(CF2)nCH2CH2Si(NCO)3(n=4 (VII), 6 (VIII), or 8 (IX)), were prepared via reactions of α,ω-bischlorosilanes synthesized with sodium methoxide and silver cyanate, respectively. The structures of silicon wafer surfaces modified with the α,ω-bismethoxysilanes were investigated by polarized FT-IR spectroscopy. The bismethoxysilanes reacted with silicon wafer surface through only one of the reactive groups, -Si(OCH3)3, thereby forming no loop structure on the surface.