Acta Cryst. (2012). E68, m1514
[ doi:10.1107/S1600536812047101 ]

catena-Poly[[aquabis[N-(pyridin-3-yl)isonicotinamide-N¹]copper(II)]--fumarato-²O¹:O⁴]

S. H. Qiblawi and R. L. LaDuca

Abstract: In the title compound, [Cu(C₄H₂O₄)(C₁₁H₉N₃O)₂(H₂O)]_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(H₂O)]_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-HO hydrogen bonds between aqua ligands and unligating fumarate O atoms, and N-HO(=C) hydrogen bonds between 3-pina ligands. In turn, the layers aggregate by weak C-HN and C-HO hydrogen bonds, affording a three-dimensional network.

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