Organosilanols: The structure of 1,1,3,3-tetraphenyldisiloxane-1,3-diol

The title compound is triclinic, space groupP¯1, witha=13.468(2),b=20.289(2),c=14.247(1) A,α=98.92(1),β=113.42(1),γ=99.52(1)°,Vc=3416(1) A3, andZ=6. The structure was solved by direct methods and refined by full-matrix least squares toR=0.078,Rw=0.089, for 6511 observed data. The molecules hydrogen-bond into helical chains parallel to [111], each oxygen being involved in one donor and one acceptor hydrogen bond. The geometry of the siloxane link is different in the three independent molecules present, with Si-O-Si angles of 147.8(3), 157.0(3), and 162.5(3)°.