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In the title compound, [Cu(C 4 H 2 O 4 )(C 11 H 9 N 3 O) 2 (H 2 O)]  n  , Cu II  ions on crystallographic twofold rotation axes are coordinated in a square pyramidal environment by two  trans  O atoms belonging to two monodentate fumarate anions, two  trans  isonicotinamide pyridyl N-donor atoms from monodentate, pendant 3-pyridyl­isonicotinamide (3-pina) ligands, and one apical aqua ligand, also sited on the crystallographic twofold rotation axis. The exobidentate fumarate ligands form [Cu(fumar­ate)(3-pina) 2 (H 2 O)]  n   coordination polymer chains that are arranged parallel to [001]. In the crystal, these polymeric chains are anchored into supra­molecular layers parallel to (100) by O—H⋯O hydrogen bonds between aqua ligands and unligating fumarate O atoms, and N—H⋯O(=C) hydrogen bonds between 3-pina ligands. In turn, the layers aggregate by weak C—H⋯N and C—H⋯O hydrogen bonds, affording a three-dimensional network.

acta crystallographica. section e

catena-Poly[[aquabis[N-(pyridin-3-yl)isonicotinamide-κN1]copper(II)]-μ-fumarato-κ2O1:O4]