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

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 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—H⋯O inter­actions.