... water to give reddish solutions that, depending on the age of the solution, contain varying proportions of RhCl3(H2O)3, [RhCl2(H2O)4]+, ... solids featuring octahedral Rh(III) centres. Depending on the value of n, the material is either a dense brown solid or a ... salt. The soluble salt is widely used to prepare compounds used in homogeneous catalysis, notably for the industrial production of acetic acid ...