Bis[3-(trimethylsilyl)propyl] ethylenebisphosphonate, H₂DTMSP[EBP]

Abstract

The title compound (H 2 DTMSP[EBP]), C 14 H 36 O 6 P 2 Si 2 , was crystallized by the slow evaporation of a solution in a 20:1 mixture of pentane and acetone. The H 2 DTMSP [EBP] molecule lies about an inversion center. In the solid state, the molecule exists in an anti con®guration, with the molecular backbone CÐC bond located on an inversion center. The compound exists in the solid state as hydrogen-bonded in®nite sheets in the ab plane, unlike the methylene analogue, which exists as hydrogen-bonded in®nite chains, demonstrating aǹ even±odd' effect of the length of the backbone alkyl chain.A plot of one molecule of H 2 DTMSP[EBP], with the asymmetric unit labelled. Displacement ellipsoids are drawn at the 50% probability level and H atoms are shown as small spheres of arbitrary radii.