Poly[[[µ-1,1'-(butane-1,4-di-yl)diimidazole-κN:N](µ-cyclo-hexane-1,4-dicarboxyl-ato-κO,O:O,O)nickel(II)] 0.25-hydrate].

In the title coordination polymer, {[Ni(C(8)H(10)O(4))(C(10)H(14)N(4))]·0.25H(2)O}(n), the coordination of the Ni(II) ion is distorted octa-hedral. The 1,1'-(butane-1,4-di-yl)diimidazole ligand and the cyclo-hexane-1,4-dicarboxyl-ate dianion bridge metal centres, forming a two-dimensional (4,4) network. The network is consolidated by O-H⋯O hydrogen bonds between the statistically occupied water molecules and O atoms of the two carboxylate groups.