| Abstract: | The crystal structure of the title compound, Zr(OH)2CrO4, has been reinvestigated [Mark (1972). Acta Chem. Scand. 26 , 3744–3756]. It is composed of ordered layers whose stacking in the c direction is disordered. The symmetry of the superposition structure is tetragonal, space group I41/amd with a = 6.8709 (1) and c = 29.0432 (2) Å. The true 0D structure has ordered layers of the dimensions aL = bL = 2a and c0 = c/4, where c0 is the spacing between adjacent layers. The Zr atoms are joined by double hydroxide bridges and the structure consists of infinite nets with the composition [Zr3(OH)6CrO4]n4n+, joined together in c direction by chromate groups. The zirconium polyhedra are not influenced by the 0D phenomenon. |
