X-Ray Crystal Structure of [Rh(OH₂)₆](ClO₄)₃.3H₂O

Abstract

The crystal structure of [Rh(OH₂)₆](ClO₄)₃.3H₂O has been determined by single-crystal X-ray diffraction and found to be isomorphous with that of M(ClO₄)₂.6H₂O (M= Fe, Zn, Mn, Co, Ni) and LiClO₄.3H₂O. Crystal: are hexagonal, space group P6₃mc with unit cell dimensions a 7.817(2) and c 5.208(1) Å. The lattice consists of a uniform arrangement of H₂O and ClO₄- groups with the Rh^III centre occupying 1/3 of the octahedral sites formed by the H₂O groups. The Rh^III is not situated at the centre of the octahedron. However, the two Rh-O distances [2.128(6) and 2.136(6) Å] may be considered identical, i.e. within the errors.