Crystal structure of catena-poly[[di­aqua­bis­(4-formyl­benzoato-κO 1)cobalt(II)]-μ-pyrazine-κ2 N:N′]

• Published in: Acta crystallographica. Section E, Crystallographic communications Vol. 71; no. Pt 4; pp. 339 - 341
• Main Authors: Aşkın, Gülçin Şefiye, Çelik, Fatih, Dilek, Nefise, Necefoğlu, Hacali, Hökelek, Tuncer
• Format: Journal Article
• Language: English
• Published: International Union of Crystallography 01.04.2015
• Subjects: benzoic acid derivatives; cobalt(II); crystal structure; one-dimensional coordination polymer; Research Communications; transition metal complexes
• ISSN: 2056-9890; 2056-9890
• DOI: 10.1107/S205698901500403X

The Co II atom in this one-dimensional coordination polymer, with aqua, 4-formyl­benzoate and bridging pyrazine ligands, is located on a twofold rotation axis and has a slightly distorted octa­hedral coordination sphere. Strong intra­molecular O—H⋯O hydrogen bonds link the water mol­ecules to the carboxyl­ate O atoms. In the title polymeric compound, [Co(C 8 H 5 O 3 ) 2 (C 4 H 4 N 2 )(H 2 O) 2 ] n , the Co II 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 two bridging pyrazine ligands. The latter are 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 7.50 (8)°, while the benzene and pyrazine rings are oriented at a dihedral angle of 64.90 (4)°. The pyrazine ligands bridge the Co II cations, forming linear 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, weak O—H water ⋯O water hydrogen bonds link adjacent chains into layers parallel to the bc plane. The layers are linked via C—H pyrazine ⋯O form­yl hydrogen bonds, forming a three-dimensional network. There are also weak C—H⋯π inter­actions present.