Acta Cryst. (2008). E64, i69-i70  [ doi:10.1107/S1600536808028365 ]

A second polymorph with composition Co₃(PO₄)₂·H₂O

Y. H. Lee, J. K. Clegg, L. F. Lindoy, G. Q. M. Lu, Y.-C. Park and Y. Kim

Abstract: Single crystals of Co₃(PO₄)₂·H₂O, tricobalt(II) bis[orthophosphate(V)] monohydrate, were obtained under hydrothermal conditions. The compound is the second polymorph of this composition and is isotypic with its zinc analogue, Zn₃(PO₄)₂·H₂O. Three independent Co²⁺ cations are bridged by two independent orthophosphate anions. Two of the metal cations exhibit a distorted tetrahedral coordination while the third exhibits a considerably distorted [5 + 1] octahedral coordination environment with one very long Co-O distance of 2.416 (3) Å. The former cations are bonded to four different phosphate anions, and the latter cation is bonded to four anions (one of which is bidentate) and one water molecule, leading to a framework structure. Additional hydrogen bonds of the type O-HO stabilize this arrangement.

Online 13 September 2008

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