Structural and spectral studies of halogeno complexes of rhodium(III)

Abstract

Halogeno complexes of rhodium(III) of the type A₂ [RhCl₅H₂O], A₃ [RhCl₆],H₂O and A₃ [Rh₂X₉] (X = Cl, Br, A = alkali metal, ammonium and alkylammonium cations) have been prepared and investigated structurally by X-ray powder photography, and by infrared and visible spectroscopy. The relationship between the various preparative procedures has been determined. Factors such as acidity and type of cation are important. Structural and spectroscopic studies have revealed trends which, in some cases, can be related to the influence of the cations on the halogenorhodate(III) anions in the solid state, and, in other cases, to the ionic/covalent nature of the metal-halogen bond.