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The 4,4′-bi­pyridine spacer in the crystal structure of the title compound, {[Cu(C10H8N2)2(H2O)]2(C8H4O4)·2H2O} n, links the water-coordinated CuI atoms into a linear chain in which the metal atom exists in a T-shaped environment [N—Cu—N = 156.6 (1)°]. Interacting through the coordinated water mol­ecules, the chains connect with the centrosymmetric terephthalate dianions and uncoordinated water mol­ecules to form a three-dimensional network structure. [ABSTRACT FROM AUTHOR]

The Zn atom in the title compound, [Zn(H2O)6](C6H4NO3)2, lies on a special position of 2/ m site symmetry in an octa­hedron made up of water mol­ecules. The anion is disordered across a mirror plane. The cation inter­acts with the anion indirectly through hydrogen bonds to form a three-dimensional network. [ABSTRACT FROM AUTHOR]

The molecule of the title compound, C10H18N8S2, lies on a twofold rotation axis. Methyl C atoms contact N atoms of adjacent mol­ecules through C—H⋯N hydrogen bonds [3.445 (3) Å] in a mol­ecular layer. In addition, the layers are linked by weak S⋯S inter­actions [3.636 (3) Å]. [ABSTRACT FROM AUTHOR]