Acta Cryst. (2008). E64, m736-m737  [ doi:10.1107/S1600536808010994 ]

-Pyrazine-bis[tetraaquacadmium(II)] -pyrazine-bis[tetraacetatocadmium(II)]

H.-K. Fun, S. Chantrapromma and F. Marandi

Abstract: 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 Cd^II 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 Cd^II 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 Cd^II 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.

Online 30 April 2008

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