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Acta Cryst. (2014). E70, m4-m5  [ doi:10.1107/S1600536813032297 ]


F. Çelik, N. Dilek, N. Çaylak Delibas, H. Necefoglu and T. Hökelek

Abstract: In the title polymeric compound, [Cu(C8H5O3)2(C4H4N2)(H2O)2]n, the CuII atom is located on a twofold rotation axis and has a slightly distorted octa­hedral coordination sphere. In the equatorial plane, it is coordinated by two carboxyl­ate O atoms of two symmetry-related monodentate formyl­benzoate anions and by two N atoms of the bridging pyrazine ligand, which is bis­ected by the twofold rotation axis. The axial positions are occupied by two O atoms of the coordinating water mol­ecules. In the formyl­benzoate anion, the carboxyl­ate group is twisted away from the attached benzene ring by 6.2 (2)°, while the benzene and pyrazine rings are oriented at a dihedral angle of 68.91 (8)°. The pyrazine ligands bridge the CuII cations, forming polymeric chains running along the b-axis direction. Strong intra­molecular O-H...O hydrogen bonds link the water mol­ecules to the carboxyl­ate O atoms. In the crystal, O-Hwater...Owater hydrogen bonds link adjacent chains into layers parallel to the bc plane. The layers are linked via C-Hpyrazine...Oform­yl hydrogen bonds, forming a three-dimensional network. There are also weak C-H...[pi] inter­actions present.

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