Received 31 March 2008
aX-ray Crystallography Unit, School of Physics, Universiti Sains Malaysia, 11800 USM, Penang, Malaysia,bDepartment of Chemistry, Faculty of Science, Prince of Songkla University, Hat-Yai, Songkhla 90112, Thailand, and cDepartment of Science, Payame Noor University, Zanjan, Iran
Correspondence e-mail: firstname.lastname@example.org
In the title dinuclear ionic complex, [Cd2(C4H4N2)(H2O)8][Cd2(CH3CO2)8(C4H4N2)], the cation and anion are disordered equally over a site with symmetry mmm. The CdII ions and the N atoms of the bridging pyrazine ligand lie on the intersection of two crystallographic mirror planes. The C atoms of the bridging pyrazine ligand lie on one of these mirror planes, and the acetate groups and water molecules lie across the intersecting mirror planes. Each CdII atom in the cation is five-coordinated by four O atoms from four water molecules and one N atom from the bridging pyrazine ligand, whereas each CdII in the anion is nine-coordinated by four pairs of O atoms from the bidentate acetate ligands and one N atom from the bridging pyrazine ligand. In the crystal structure, each anion is surrounded by eight nearest-neighbour cations and vice versa. The crystal structure is stabilized by ionic interactions as well as by C-HO interactions.
For bond-length data, see: Allen et al. (1987). For CdII coordination chemistry, applications and related structures, see: Filipovic et al. (2008); Inoue et al. (2000); Pons et al. (2007); Xia et al. (2004).
Data collection: APEX2 (Bruker, 2005); cell refinement: APEX2; data reduction: SAINT (Bruker, 2005); program(s) used to solve structure: SHELXTL (Sheldrick, 2008); program(s) used to refine structure: SHELXTL; molecular graphics: SHELXTL; software used to prepare material for publication: SHELXTL and PLATON (Spek, 2003).
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: CI2576 ).
The authors thank the Malaysian Government and Universiti Sains Malaysia for the Scientific Advancement Grant Allocation (SAGA) grant No. 304/PFIZIK/653003/A118. SC thanks Prince of Songkla University for generous support.
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