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In the title compound, [Cu(C 11 H 10 N 3 O) 2 (C 8 H 4 O 5 ) 2 ]·4H 2 O, the Cu II  ion, located on a crystallographic inversion center, is coordinated in a square-planar environment by two  trans -O atoms belonging to two monodentate 5-hy­droxy­isophthalate (hip) dianions and two  trans  nicotinamide pyridyl N-donor atoms from monodentate protonated pendant  N -(pyridin-4-yl)nicotinamide (4-pnaH) ligands. The protonated 4-pyridyl­amine groups engage in N—H + ⋯O −  hydrogen-bond donation to unligated hip O atoms to construct supra­molecular chain motifs parallel to [100]. Water mol­ecules of crystallization, situated between the chains, engage in O—H⋯O hydrogen bonding to form supra­molecular layers and the overall three-dimensional network structure.

Bis(5-hydroxyisophthalato-κO1)bis[4-(pyridine-3-carboxamido-κN3)pyridinium]copper(II) tetrahydrate

Bis(5-hydroxyisophthalato-κO¹)bis[4-(pyridine-3-carboxamido-κN³)pyridinium]copper(II) tetrahydrate