Received 29 August 2008
aDepartment of Chemistry, Kyungpook National University, Daegu 702-701, Republic of Korea,bCentre for Heavy Metals Research, School of Chemistry, F11, University of Sydney, New South Wales 2006, Australia,cARC Centre of Excellence for Functional Nanomaterials, AIBN, University of Queensland, Brisbane, Queensland 4072, Australia, and dDepartment of Chemistry and Advanced Materials, Kosin University, 149-1 Dongsam-dong, Yeongdo-gu, Busan 606-701, Republic of Korea
Correspondence e-mail: email@example.com
Single crystals of Co3(PO4)2·4H2O, tricobalt(II) bis[orthophosphate(V)] tetrahydrate, were obtained under hydrothermal conditions. The title compound is isotypic with its zinc analogue Zn3(PO4)2·4H2O (mineral name hopeite) and contains two independent Co2+ cations. One Co2+ cation exhibits a slightly distorted tetrahedral coordination, while the second, located on a mirror plane, has a distorted octahedral coordination environment. The tetrahedrally coordinated Co2+ is bonded to four O atoms of four PO43- anions, whereas the six-coordinate Co2+ is cis-bonded to two phosphate groups and to four O atoms of four water molecules (two of which are located on mirror planes), forming a framework structure. In addition, hydrogen bonds of the type O-HO are present throughout the crystal structure.
Besides crystals of the title compound, crystals of Co3(PO4)2·H2O (Lee et al., 2008) have also been obtained under hydrothermal conditions. For reviews, synthesis, structures and applications of open framework structures with different cations and/or structure directing molecules, see: Kuzicki et al. (2001); Chen et al. (2006); Jiang & Gao (2007); Cheetham et al. (1999); Forster et al. (2003); Jiang et al. (2001); Cooper et al. (2004); Choudhury et al. (2000). The structure of the isotypic mineral hopeite was first described by Liebau (1965).
Data collection: SMART (Siemens, 1995); cell refinement: SAINT (Siemens, 1995); data reduction: SAINT and XPREP (Siemens, 1995); program(s) used to solve structure: SIR97 (Altomare et al., 1999); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEP-3 (Farrugia, 1997), WebLab ViewerPro (Molecular Simulations, 2000) and POV-RAY (Cason, 2002); software used to prepare material for publication: enCIFer (Allen et al., 2004).
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: WM2193 ).
We gratefully acknowledge the Brain Korea 21 programme and the Australian Research Council for support.
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