title: Crystal structure of trans-di-aqua-bis-(4-cyano-benzoato-κO)bis-(nicotinamide-κN (1))cobalt(II).
abstract: In the title complex, [Co(C8H4NO2)2(C6H6N2O)2(H2O)2], the Co(II) atom is located on an inversion centre and is coordinated by two 4-cyano-benzoate (CNB) anions, two nicotinamide (NA) ligands and two water mol-ecules. The four O atoms in the equatorial plane form a slightly distorted square-planar arrangement, while the slightly distorted octa-hedral coordination sphere is completed by the two N atoms of the NA ligands in the axial positions. The dihedral angle between the carboxyl-ate group and the adjacent benzene ring is 22.11 (15)°, while the pyridine and benzene rings are oriented at a dihedral angle of 89.98 (5)°. In the crystal, inter-molecular N-H⋯O and O-H⋯O hydrogen bonds link the mol-ecules, enclosing R 2 (2)(8) and R 4 (4)(8) ring motifs, forming layers parallel to (100). The layers are linked via C-H⋯O and C-H⋯N hydrogen bonds, resulting in a three-dimensional network. A weak C-H⋯π inter-action is also observed.
authors.affiliation: Department of Physics, Hacettepe University, 06800 Beytepe, Ankara, Turkey.
authors.forename: Gülçin Şefiye
authors.initials: GŞ
authors.lastname: Aşkın
authors.affiliation: Department of Chemistry, Kafkas University, 36100 Kars, Turkey ; International Scientific Research Centre, Baku State University, 1148 Baku, Azerbaijan.
authors.forename: Hacali
authors.initials: H
authors.lastname: Necefoğlu
authors.affiliation: Department of Chemistry, Kafkas University, 36100 Kars, Turkey.
authors.forename: Gamze
authors.initials: G
authors.lastname: Yılmaz Nayir
authors.affiliation: Scientific and Technological Application and Research Center, Aksaray University, 68100 Aksaray, Turkey.
authors.forename: Raziye
authors.initials: R
authors.lastname: Çatak Çelik
authors.affiliation: Department of Physics, Hacettepe University, 06800 Beytepe, Ankara, Turkey.
authors.forename: Tuncer
authors.initials: T
authors.lastname: Hökelek
keywords: cobalt(II); crystal structure; transition metal complexes of benzoic acid and nicotinamide derivatives