Crystal structure and Hirshfeld surface analysis of hexa-kis-(μ-benzoato-κ 2 O : O ')bis-(pyridine-3-carbo-nitrile-κ N 1 )trizinc(II).

The asymmetric unit of the title complex, [Zn3 (C7 H5 O2 )6 (C6 H4 N2 )2 ], contains one half of the complex mol-ecule, i.e. one and a half ZnII cations, three benzoate (Bnz) and one pyridine-3-carbo-nitrile (Cpy) mol-ecule; the Bnz anions act as bidentate ligands through the carboxyl-ate O atoms, while the Cpy ligand acts as a monodentate N(pyridine)-bonding ligand. The complete centrosymmetric trinuclear complex thus comprises a linear array of three ZnII cations. The central ZnII cation shows an octa-hedral coordination and is bridged to each of the terminal ZnII cations by three Bnz anions. By additional coordination of the CPy ligand, the terminal ZnII cations adopt a trigonal-pyramidal coordination environment. In the crystal, the Bnz anions link to the Cpy N atoms via weak C-H⋯N hydrogen bonds, forming a two-dimensional network. C-H⋯π and π-π inter-actions [between the benzene and pyridine rings of adjacent mol-ecules with an inter-centroid distance of 3.850 (4) Å] help to consolidate a three-dimensional architecture. The Hirshfeld surface analysis confirms the role of H-atom contacts in establishing the packing.