Crystal Structure Of Bis­(Μ-3-Nitro­Benzoato)-Κ3 O,O′:O;Κ3 O:O,O′-Bis­[Bis­(3-Cyano­Pyridine-Κn 1)(3-Nitro­Benzoato-Κ2 O,O′)Cadmium]

Abstract

In the title cadmium complex of 3-nitro­benzoate and 3-cyano­pyridine, binuclear centrosymmetric mol­ecules are present, with cadmium being surrounded in an N2O5 coordinaton set in a distorted penta­gonal–bipyramidal shape., The asymmetric unit of the title compound, [Cd2(C7H4NO4)4(C6H4N2)4], contains one CdII atom, two 3-nitro­benzoate (NB) anions and two 3-cyano­pyridine (CPy) ligands. The two CPy ligands act as monodentate N(pyridine)-bonding ligands, while the two NB anions act as bidentate ligands through the carboxyl­ate O atoms. The centrosymmetric dinuclear complex is generated by application of inversion symmetry, whereby the CdII atoms are bridged by the carboxyl­ate O atoms of two symmetry-related NB anions, thus completing the distorted N2O5 penta­gonal–bipyramidal coordination sphere of each CdII atom. The benzene and pyridine rings are oriented at dihedral angles of 10.02 (7) and 5.76 (9)°, respectively. In the crystal, C—H⋯N hydrogen bonds link the mol­ecules, enclosing R 2 2(26) ring motifs, in which they are further linked via C—H⋯O hydrogen bonds, resulting in a three-dimensional network. In addition, π–π stacking inter­actions between parallel benzene rings and between parallel pyridine rings of adjacent mol­ecules [shortest centroid-to-centroid distances = 3.885 (1) and 3.712 (1) Å, respectively], as well as a weak C—H⋯π inter­action, may further stabilize the crystal structure.