Acta Crystallographica Section C

Crystal Structure Communications

Volume 58, Part 7 (July 2002)

Acta Cryst. (2002). C58, o409-o415    [doi:10.1107/S0108270102009381]

Tetrameric triphenylsilanol, (Ph₃SiOH)₄, and the adduct (Ph₃SiOH)₂-dimethyl sulfoxide, both at 120  K, and the adduct (Ph₃SiOH)₄-1,4-dioxan at 150  K: interplay of O-HO and C-H(arene) interactions

K. F. Bowes, C. Glidewell and J. N. Low

Abstract: The structure of tetrameric triphenylsilanol, C₁₈H₁₆OSi, (I), has been re-investigated at 120  (2)  K. The hydroxyl H atoms were readily located and one of the arene rings is disordered over two closely positioned sets of sites. The molecules are linked into cyclic tetramers, having approximate (S₄) symmetry, via O-HO hydrogen bonds [HO 1.81-1.85  Å, OO 2.634  (3)-2.693  (3)  Å and O-HO 156-166°]. At ambient temperature, there are indications of multiple disorder of the phenyl-ring sites. In bis(triphenylsilanol) dimethyl sulfoxide solvate, 2C₁₈H₁₆OSi·C₂H₆OS, (II), the dimethyl sulfoxide component is disordered across a twofold rotation axis in C2/c, and the molecular components are linked by a single O-HO hydrogen bond [HO 1.85  Å, OO 2.732  (2)  Å and O-HO 172°] into three-molecule aggregates, which are themselves linked into a single three-dimensional framework by two C-H(arene) interactions. In tetrakis(triphenylsilanol) 1,4-dioxan solvate, 4C₁₈H₁₆OSi·C₄H₈O₂, (III), the 1,4-dioxan component lies across an inversion centre in space group P and centrosymmetric five-molecule aggregates are linked by paired C-H(arene) interactions to form molecular ladders.

Formula: C₁₈H₁₆OSi, 2C₁₈H₁₆OSi·C₂H₆OS and 4C₁₈H₁₆OSi·C₄H₈O₂

Online 20 June 2002

	Structure factor file (CIF format) (1235.1 kbytes) Contains datablock I
	Structure factor file (CIF format) (186.8 kbytes) Contains datablock II
	Structure factor file (CIF format) (337.9 kbytes) Contains datablock III

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