{Diaquo(3,5-dinitrobenzoato-κ1O1)(1,10-phenanthroline-κ2N1:N10)}copper(II)] 3,5-dinitrobenzoate: Hydrothermal synthesis, crystal structure and magnetic properties

Abstract

Metal-organic hybrid complexes often exhibit large surface area, pore volume, fascinating structures and diversified potential applications. Hence a new metal-organic hybrid complex [{Diaquo(3,5-dinitrobenzoato-κ1O1)(1,10-phenanthroline-κ2N1:N10)}copper(II)] 3,5-dinitrobenzoate, i.e., [Cu(C7H3N2O6)(C12H8N2)(H2O)2](C7H3N2O6) was synthesized hydrothermally. Physico-chemical characterization of the complex was performed with FTIR spectroscopy, single crystal X-ray diffraction, TGA, EPR, SQUID and FESEM. Single crystal X-ray diffraction study suggests it to be three dimensional with space group P1211 (monoclinic). The unit cell dimensions are a = 9.3085 (5), b = 5.9069 (2) and c = 25.0995 (12) Å; the axial angles are α = 90°, β = 96.790 (4)° and γ = 90°. The asymmetric unit contains a penta-coordinated CuII ion coordinated to two H2O molecules, two N-atoms of 1,10-phenanthroline and O-atom of the carboxylic group of 3,5-dinitrobenzoic acid in a distorted square pyramidal geometry. The crystal achieves its three-dimensional structure and stability through extensive inter- and intra-molecular hydrogen bonds mediated through non-coordinated 3,5-dinitrobenzoate moieties. TGA, EPR, Hirshfeld topology analysis and SQUID studies revealed it to be a stable and weakly antiferromagnetic material.