Bis(μ-2-fluorobenzoato-1:2κ2O:O′)(2-fluorobenzoato-1κ2O,O′)(2-fluorobenzoato-2κO)dinicotinamide-1κN1,2κN1-dizinc(II)–2-fluorobenzoic acid (1/1)

Abstract

The asymmetric unit of the title compound, [Zn2(C7H4FO2)4(C6H6N2O)2]·C7H5FO2, consists of a binuclear ZnII complex bridged by two carboxyl groups of 2-fluorobenzoate (FB) anions and a 2-fluorobenzoic acid molecule. The two bridging FB anions, one chelating FB anion and one nicotinamide (NA) ligand coordinate to one Zn cation with a distorted square-pyramidal geometry, while the two bridging FB anions, one monodentate FB anion and one NA ligand coordinate to the other Zn cation with a distorted tetrahedral geometry. Within the binuclear molecule, the pyridine rings are oriented at a dihedral angle of 19.41 (14)°. In the crystal structure, the uncoordinated 2-fluorobenzoic acid molecules are linked by O—H...O hydrogen bonding, forming centrosymmetric supramolecular dimers. Intermolecular N—H...O hydrogen bonds link the complex molecules into a three-dimensional network. The π–π contacts between nearly parallel pyridine and benzene rings [dihedral angles of 19.41 (14) and 12.72 (16)°, respectively, centroid–centroid distances = 3.701 (2) and 3.857 (3) Å] may further stabilize the crystal structure. The fluorine atoms in two FB ligands are disordered over two positions, with occupancy ratios of 0.70:0.30.