| Summary: | The asymmetric unit of the title coordination polymer, {[Gd2(C8H4O5)3(C10H8N2)2(H2O)2]·3H2O}n, contains two GdIII cations, one of which is surrounded by three 5-hydroxyisophthalate anions, one 2,2′-bipyridine ligand and two water molecules in a distorted N2O7 tricapped trigonal–prismatic coordination geometry. The other Gd cation is coordinated by four 5-hydroxyisophthalate anions and one 2,2′-bipyridine ligand in a distorted N2O7 tricapped trigonal–prismatic coordination geometry. The 5-hydroxyisophthalate anions bridge the Gd cations, forming a layer structure. The layers are further connected by extensive O—H...O hydrogen bonding, assembling a three-dimensional supramolecular network.
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