Poly[[[mu-1,1'-(butane-1,4-diyl)diimidazole-kappa2N:N'](mu-cyclohexane-1,4-dicarboxylato-kappa4O1,O1':O4,O4')cadmium(II)] hemihydrate]: a parallel interpenetrating two-dimensional (4,4) network.

In the title coordination compound, {[Cd(C(8)H(10)O(4))(C(10)H(14)N(4))].0.5H(2)O}(n), the 1,1'-(butane-1,4-diyl)diimidazole ligand and the cyclohexane-1,4-dicarboxylate dianion both function in a bridging mode to link adjacent cadmium(II) centers into a two-dimensional four-connected (4,4) network. The networks are parallel to the (001) plane. Two (4,4) networks are interpenetrated in an unusual parallel mode. The compound is the first two-dimensional parallel interpenetrating (4,4) network structure based on a flexible dicarboxylate and a long bidentate N-donor ligand. The interpenetrating nets are further consolidated by water-carboxylate O-H...O hydrogen bonds.