MOLECULAR AND CRYSTAL-STRUCTURE OF TRIPHENYLSILANOL

Single crystals of triphenylsilanol have been grown from toluene solution and the molecular and crystal structure determined by low temperature X-ray diffraction. Ph3SiOH crystallizes in the triclinic space group P1BAR (No. 2) with a = 1513.1(4), b = 1972.4(5), c = 2310.7(5) pm, alpha = 108.34(2), beta = 103.30(2), gamma = 101.26(2)-degrees, V = 6.097 nm3 and Z = 16. The structure was solved by direct methods and refined by block-matrix least-squares methods to a final R(w)-value of 0.080 (R = 0.079) for 9079 reflections and 1431 parameters. The crystal structure consists of eight nearly tetrahedral Ph3SiOH molecules which are connected by -OH ... O- hydrogen bridges to two tetrameric building units. Inside these units the four silicon atoms are arranged in form of a flat tetrahedron. The crystal data of the isotypic triphenylgermanol are mentioned.