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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-κO)(N,N,N',N'-tetramethylethylenediamine-κ²N,N')copper(II), [Cu(C7H4NO4)2(C6H16N2)] or [Cu(2-nitrobenzoate)2(tmeda)]. Each carboxyl-ate group of the 2-nitrobenzoate ligand is coordinated by CuII 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⋯O hydrogen bonds, forming ribbons via a R2²(10) ring motif. These ribbons are linked by further C--H⋯O hydrogen bonds, leading to two-dimensional hydrogen-bonded arrays parallel to the bc plane. Weak π-π stacking interactions provide additional stabilization of the crystal structure. Hirshfeld surface analysis, dnorm 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⋯H/H⋯O (44.9%), H⋯H (34%) and C⋯H (14.5%). [ABSTRACT FROM AUTHOR]

In the title compound, diaquabis(ethylenediamine-K²N,N')copper(II) bis(2- nitrobenzoate), [Cu(C2H8N2)2 (H2 O)2](C7H4NO4), 2 two diaquabis(ethylenedi-amine)copper(II) cations and four nitrobenzoate anions are present in the asymmetric unit. All four anions are 'whole-molecule' disordered over two sets of sites. The major components have refined occupancies of 0.572 (13), 0.591 (9), 0.601 (9) and 0.794 (10). The CuII ions exhibit slightly distorted octahedral geometries. In the crystal, cations and anions are connected to each other via N--H ⋯O and O--H ⋯O hydrogen bonds, forming a two-dimensional network parallel to (200). The intermolecular contacts in the crystal were further analysed using Hirshfeld surface analysis, which indicates that the most significant contacts are O ⋯H/H ⋯O (42.9%), followed by HH (35.7%), C ⋯H/H ⋯C (14.2%), C ⋯C (2.9%), C ⋯O/O ⋯C (2.2%), N ⋯H/H ⋯N (0.9%) and N ⋯O/O ⋯N (0.3%). [ABSTRACT FROM AUTHOR]