Synthesis, structure and Hirshfeld surface analysis of diaquadmitratobis(4-nitroanmne)copper(II)

A new metal complex, [Cu(NO3)(2)(C6H6N2O2)(2)(H2O)(2)], was synthesized from water-ethanol solutions of Cu(NO3)(2) and 4-nitroaniline (PNA). The complex molecules are located on inversion centers in monoclinic crystals with space group P2(1)/c. The copper(II) ions are monodentately coordinated by two neutral PNA molecules through the nitrogen atom of the amino group, two NO 3 anions and two water molecules. The coordination polyhedron of the central ion is a distorted octahedron as a result of the Jahn-Teller effect. There is a weak intramolecular hydrogen bond between the N-H group and the oxygen atom of one nitrate anion. Six relatively weak intermolecular hydrogen bonds associate the complex molecules into a three-dimensional network. The Hirshfeld surface analysis indicates that 55.8% of the intermolecular interactions are from O center dot center dot center dot H/H center dot center dot center dot O contacts, 13.3% are from H center dot center dot center dot H contacts while other contributions are from C center dot center dot center dot O/O center dot center dot center dot C, C center dot center dot center dot H/H center dot center dot center dot C, O center dot center dot center dot O and other contacts.