Crystal Structure and Hirshfeld Surface Analysis of a Copper(II) Complex Containing 2-Nitrobenzoate and Tetramethylethylenediamine Ligands

Abstract

The reaction of copper(II) sulfatepentahydrate with 2-nitrobenzoic acid and N,N,N',N'-tetramethylethylenediamine (TMEDA) in basic solution produces the complex bis(2-nitrobenzoato-kappa O)(N,N,N',N'-tetramethylethylenediamine-kappa N-2,N')copper(II), [Cu(C7H4NO4)(2)(C6H16N2)] or [Cu(2-nitrobenzoate)(2)-(tmeda)]. Each carboxylate group of the 2-nitrobenzoate ligand is coordinated by Cu-II atom in a monodentate fashion and two TMEDA ligand nitrogen atoms are coordinate by the metal center, giving rise to a distorted square-planar coordination environment. In the crystal, metal complexes are linked by centrosymmetric C-H center dot center dot center dot O hydrogen bonds, forming ribbons via a R-2(2)(10) ring motif. These ribbons are linked by further C-H center dot center dot center dot O hydrogen bonds, leading to two-dimensional hydrogen-bonded arrays parallel to the be plane. Weak pi-pi stacking interactions provide additional stabilization of the crystal structure. Hirshfeld surface analysis, d(norm) and two-dimensional fingerprint plots were examined to verify the contributions of the different intermolecular contacts within the supramolecular structure. The major interactions of the complex are O center dot center dot center dot H/H center dot center dot center dot O (44.9%), H center dot center dot center dot H (34%) and C center dot center dot center dot H (14.5%).