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·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.
Besides crystals of the title compound, crystals of the related phase Co3(PO4)2·4H2O (Lee et al., 2008) were also obtained under hydrothermal conditions. For a review of metal complexes of organophosphate esters and open-framework metal phosphates, see: Murugavel et al. (2008). For different cobalt(II) phosphates, see: Mellor (1935). The first polymorph of composition Co3(PO4)2·H2O was reported by Anderson et al. (1976), and the crystal structure of the isotypic Zn analogue Zn3(PO4)2·H2O was described by Riou et al. (1986).
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: WM2194 ).
We gratefully acknowledge the Brain Korea 21 programme and the Australian Research Council for support.
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