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In the title compound, {[Fe(C10H8N2)2(H2O)2](C12H7N2O4S2)2}n, synthesized by hydro­thermal reaction, the 4,4′-bipyridyl ligands (one with symmetry 2, one with symmetry \overline1) connect Fe2+ cations, forming a cationic layer parallel to (001). The coordination of the Fe2+ cation (site symmetry 2) is octahedral, with four N atoms from four 4,4′-bipyridyl ligands and O atoms from two trans water molecules. Adjacent layers are linked with each other by inter­molecular O—H...O hydrogen bonds, forming a three-dimensional supra­molecular structure. Parts of the nicotinic acid derivative are equally disordered over two sets of sites.

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In the binuclear title compound, [Cu2(C8H4O4)Cl(C10H8N2)2(H2O)3]NO3·H2O, the two crystallographically independent CuII ions have similar coordination environments. One of the CuII ions has a square-pyramidal arrangement, which is defined by a water mol­ecule occupying the apical position, with the equatorial ligators consisting of two N atoms from a 2,2′-bipyridine mol­ecule, one carboxyl­ate O atom from a terephthalate ligand and one O atom from a water mol­ecule. The other CuII ion has a similar coordination environment, except that the apical position is occupied by a chloride ligand instead of a water mol­ecule. An O—H...O and O—H...Cl hydrogen-bonded three-dimensional network is formed between the components.
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