Pentafluoro-lambda(6)-sulfanyl-terminated chlorosilanes: New SF5-containing films and polysiloxane materials

Two new SF5-terminated perfluoroalkylsilanes-SF5(CF2CF2)(n)CH2CH2SiCl3 (n = 1 and 2)were synthesized by addition of trichlorosilane to the correspondi ng synthetic SF5-terminated perfluoroalkenes by hydrosilylation. Thin films of these SF5-silanes on clean silicon oxide substrates were characterized by ellipsometry, aqueous contact angle, and X-ray photoelectron spectroscop y (XPS) methods. The shorter SF5-silane film shows a hydrophobic interface with minimal angle dependence in depth-dependent XPS analysis, suggesting a poorly organized film. The longer SF5-silane exhibits a high aqueous stati c contact angle (106 degrees) and angular-dependent XPS compositional varia nce consistent with improved film assembly (fewer defects and more vertical chain orientation). Bulk SF5-bearing materials were fabricated by silane h ydrolysis, producing SF5-polymers and cross-linked networks bearing the uni que SF5 perfluoroalkyl chemistry.