Research Article: Triclinic polymorph of bis­(triphenyl­sil­yl) oxide toluene disolvate

Date Published: March 01, 2012

Publisher: International Union of Crystallography

Author(s): Andrew P. Purdy, Emily Smoot, Ray J. Butcher, Andrew Kerr.


A new polymorph of the title compound, C36H30OSi2·2C7H8, is reported, which is triclinic (P-1) instead of possessing the previously reported rhombohedral symmetry [Hönle et al. (1990). Acta Cryst. C46, 1982–1984]. Each of the –SiPh3 units are related by the inversion center. The Si—O—Si moiety is linear with the O atom sitting on an inversion center, and the O—Si—(toluene ring centroid) angle is 3.69 (15)°. Each toluene mol­ecule is 5.622 (2) Å from the Si atom and has its closest contacts with the phenyl rings outside of the van der Waals radii.

Partial Text

For the rhombohedral polymorph of the title compound and its benzene analog, see: Hönle et al. (1990 ▶). For the structures of related compounds, see: Glidewell & Liles (1978 ▶); Morosin & Harrah (1981 ▶); Suwińska et al. (1986 ▶). For the determination by IR spectroscopy of silylcarbonate in the reaction product, see: Yildirimyan & Gattow (1984 ▶).