metal-organic compounds
Crystal structures of six (CH3)3SOCdCl3 - xBrx mixed compounds [(1) x = 2.116, (2) x = 1.787, (3) x = 1.183, (4) x = 0.962, (5) x = 0.607, (6) x = 0.286] have been determined. Each has space group Pnma and is a structural analogue of (CH3)3SOCdCl3 and (CH3)3SOCdBr3, reported previously. The distribution of Br and Cl atoms among the two anionic sites was especially studied. We have shown that the occupation probabilities are related to the x value but do not vary with it linearly: the Cl atoms marked a preference for the most symmetric site (m symmetry) while the Br atoms were better located on a general position more distant from the Cd ion. It is therefore not possible to describe these mixed compounds in terms of continuous solid solutions series.