Abstract
In the title polymeric compound, [Ni(C8H5O3)2(C4H4N2)(H2O)2]n, the NiII 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 7.0 (6)°, while the benzene and pyrazine rings are oriented at a dihedral angle of 66.2 (3)°. The pyrazine ligands bridge the NiII cations, forming polymeric chains running along the b-axis direction. Intramolecular O—H⋯O hydrogen bonds link the water ligands to the carboxylate O atoms. In the crystal, water–water O—H⋯O hydrogen bonds link adjacent chains into layers parallel to the bc plane. Pyrazine–formyl C—H⋯O hydrogen bonds link the layers, forming a three-dimensional network. There are also weak C—H⋯π interactions present. The title compound is isotypic with the copper(II) complex [Çelik et al. (2014a). Acta Cryst. E70, m4–m5].
Highlights
In the title polymeric compound, [Ni(C8H5O3)2(C4H4N2)(H2O)2]n, the NiII atom is located on a twofold rotation axis and has a slightly distorted octahedral coordination sphere
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
Summary
For the isotypic copper(II) complex, see: Celik et al (2014a). In the title polymeric compound, [Ni(C8H5O3)2(C4H4N2)(H2O)2]n, the NiII atom is located on a twofold rotation axis and has a slightly distorted octahedral coordination sphere. 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 pyrazine ligands bridge the NiII cations, forming polymeric chains running along the b-axis direction. Intramolecular O—HÁ Á ÁO hydrogen bonds link the water ligands to the carboxylate O atoms. Water–water O—HÁ Á ÁO hydrogen bonds link adjacent chains into layers parallel to the bc plane. The title compound is isotypic with the copper(II) complex [Celik et al (2014a).
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