Received 12 October 2013
In the title polymeric compound, [Cu2(HCO2)4(C6H12N4)]n, the CuII atom is five-coordinated in a square-pyramidal geometry that is defined by four O atoms from four formate ligands and one N atom from a hexamethylenetetramine ligand. The two CuII atoms are separated by 2.6850 (7) Å, and together with the four formate ligands they form a paddle-wheel unit. The hexamine ligand uses only two of its four N atoms to link Cu2 cluster units, affording a zigzag chain running along the b-axis direction. The hexamine ligand lies on a mirror plane.
For background to hexamine chemistry, see: Dreyfors et al. (1989); Kirillov (2011). For hexamine as a bridging ligand, see: Pickardt (1981); Konar et al. (2003); Wang et al. (2002). For paddle-wheel Cu2-cluster units, see: Konar et al. (2003); Chiari et al. (1988); Wu & Wang (2004); Sun et al. (2009).
Data collection: SMART (Bruker, 1997); cell refinement: SAINT (Bruker, 1997); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXTL.
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: NG5345 ).
This work was partially supported by the Mid-aged and Young Foundation of Qinghai University (2012-QGT-2).
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