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The title compound, [Cu(C8H4O5)(C12H10N4)]n, was obtained by the reaction of copper(II) nitrate hydrate, with the OH-BDC organic linker and bib molecules [OH-BDC = 5-hydroxyisophthalic acid and bib = 1,4-bis(imidazol-1-yl)benzene]. The asymmetric unit comprises one CuII cation, one OH-BDC−2 dianion and a bib ligand. The CuII ion is coordinated by three carboxylate O atoms and two bib-N atoms, all from bridging ligands, to form a slightly distorted trigonal–bipyramidal geometry. The CuII ions are bridged by OH-BDC−2 ligands, forming a chain along the [100] direction; the chains are connected by bib molecules to form a two-dimensional net. In topological terms, considering the CuII atoms as nodes and the OH-BDC−2 ligands as linkers, the two-dimensional structure can be simplified as a typical 2-nodal 3,5 L2 plane network. The crystal structure features O—H...O hydrogen bonds between OH-BDC−2 anions, resulting in a three-dimensional supramolecular network

Poly[(μ3-5-hydroxyisophthalato)[μ2-1,1′-(1,4-phenylene)bis(1H-imidazole)]copper]

Poly[(μ₃-5-hydroxyisophthalato)[μ₂-1,1′-(1,4-phenylene)bis(1H-imidazole)]copper]