title: Diaqua-bis(2-chloro-benzoato-κO)bis-(nicotinamide-κN)nickel(II).
abstract: The title Ni(II) complex, [Ni(C(7)H(4)ClO(2))(2)(C(6)H(6)N(2)O)(2)(H(2)O)(2)], is centrosymmetric with the Ni atom located on an inversion centre. The mol-ecule contains two 2-chloro-benzoate (CB) and two nicotinamide (NA) ligands and two water mol-ecules, all ligands being monodentate. The four O atoms in the equatorial plane around the Ni atom form a slightly distorted square-planar arrangement, while the slightly distorted octa-hedral coordination is completed by the two N atoms of the NA ligands in the axial positions. The dihedral angle between the carboxyl group and the adjacent benzene ring is 29.48 (16)°, while the pyridine and benzene rings are oriented at a dihedral angle of 83.16 (5)°. In the crystal structure, O-H⋯O and N-H⋯O hydrogen bonds link the mol-ecules into infinite chains. π-π Contacts between the benzene and pyridine rings [centroid-centroid distance = 3.952 (1) Å] may further stabilize the crystal structure. There is also a C-H⋯π inter-action.
authors.forename: Tuncer
authors.initials: T
authors.lastname: Hökelek
authors.forename: Hakan
authors.initials: H
authors.lastname: Dal
authors.forename: Barış
authors.initials: B
authors.lastname: Tercan
authors.forename: F Elif
authors.initials: FE
authors.lastname: Ozbek
authors.forename: Hacali
authors.initials: H
authors.lastname: Necefoğlu