High resolution powder diffraction experiments were carried out on the clathrate compound [C6D4(OD)2]3(D2S)0.96 at several temperatures. Above the 7.6 K phase transition the molecules are preferentially orientated lying flat in the ab plane of the R3 structure and are disordered between six equivalent sites. Below the transition the molecular orientation becomes more localised, probably between 2 sites. © 1989.
