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In the title compound, [Ni(C(4)H(2)O(4))(C(12)H(10)N(4))(H(2)O)(2)](n), the Ni(II) ion has a distorted octa-hedral coordination geometry. The asymmetric unit is composed of an Ni(2+) ion, located on a twofold rotation axis, one half of a 1,4-bis-(1H-imidazol-1-yl)benzene (BIMB) ligand and one half of a fumarte (fum(2-)) dianion, both ligands being located about inversion centers, and a coordinating water mol-ecule. The Ni(II) ions are linked by two BIMB ligands and two fum(2-) dianions, forming a four-connected layered structure parallel to (010) with a 4(4)-sql topology. Within each layer, there are rhombic grids with dimensions of ca 13.5 × 9.0 Å and approximate angles of 109 and 70°. The crystal packing features a two-dimensional → two-dimensional parallel/parallel interpenetration in which one undulating layer is catenated to another equivalent one, forming a new bilayer. Moreover, the entangled two-dimensional layers are connected by O-H⋯O and C-H⋯O hydrogen bonds, generating a three-dimensional structure.

acta crystallographica. section e

Poly[diaqua[μ-1,4-bis(1H-imidazol-1-yl)benzene-κ2N3:N3′](μ-fumarato-κ2O1:O4)nickel(II)]