Received 18 February 2011
In the crystal structure of the title compound, poly[tri--formato-cobalt(II)potassium], [CoK(CHO2)3]n the Co2+ cations are coordinated by six O-bonded formate anions in an octahedral coordination mode and the K+ cations are eightfold coordinated by seven O-bonded formate anions within irregular polyhedra. The Co2+ cations are connected by bridging formate anions into a three-dimensional coordination network in which the K+ cations are embedded. The asymmetric unit consits of one Co2+ cation located on a center of inversion, one K+ cation located on a twofold axis and two crystallographically independent formato anions, of which one is located on a twofold axis and the other occupies a general position.
For background to this work see: Boeckmann et al. (2010); Wriedt & Näther (2010); Wriedt et al. (2009). For structures of bimetallic compounds based on potassium formate, see: Antsyshkina et al. (1983); Leontiev et al. (1988). For a description of the Cambridge Structural Database, see: Allen (2002).
Data collection: X-AREA (Stoe & Cie, 2008); cell refinement: X-AREA; data reduction: X-AREA; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: XP in SHELXTL (Sheldrick, 2008) and DIAMOND (Brandenburg, 1999); software used to prepare material for publication: XCIF in SHELXTL.
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: KJ2172 ).
We gratefully acknowledge financial support by the DFG (project number NA 720/3-1) and the State of Schleswig-Holstein. We thank Professor Dr Bensch for access to his experimental facility.
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