The title compound, [Cu2(C7H4NO4)4(C3H7NO)2]·(C3H7NO)2, is a binuclear copper(II) complex located on an inversion center midway between the two copper(II) cations. The asymmetric unit consists of one CuII cation, two 3-nitrobenzoato ligands, and two dimethylformamide (DMF) molecules, one of which coordinates to the CuII cation and one is a solvate molecule. The carboxylate groups of the ligands bridge two CuII cations with a Cu—Cu distance of 2.6554 (6) Å, completing a distorted octahedral O5Cu coordination environment. The dihedral angles between the carboxylate and the aromatic ring planes of the two independent ligands are different from one another, viz. 5.2 (3) and 23.9 (3)°. The three-dimensional structure is consolidated by weak C—H...O interactions and stabilized by π–π stacking interactions between the aromatic rings. The complex and the free ligand were further characterized by Fourier-transform infrared spectroscopy (FT–IR), and the energies of the frontier molecular orbitals of the complex were determined by DFT calculations at the B3LYP/def2-TZVP level of theory.

Key indicators: single-crystal X-ray study; T = 293 K; mean (C-C) = 0.008 Å; R factor = 0.099; wR factor = 0.272; data-to-parameter ratio = 15.3.In the title compound, [Ni(C 8 H 6 ClO 3 ) 2 (H 2 O) 4 ], the Ni II ion is located on a crystallographic inversion centre and is octahedrally coordinated by two 2-(4-chlorophenoxy)acetate ligands in axial positions and by four water molecules in the equatorial plane. The acetate ligands are bound to the Ni II ion in a monodentate manner through a carboxylate O atom. In the crystal, O-HÁ Á ÁO hydrogen bonds link the molecules, forming a two-dimensional supramolecular network lying parallel to the ab plane. Related literature

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In the title salt, C2H10N22+·2C14H10NO3−, the ethylenediaminium dication lies on an inversion centre. In the anion, the benzene rings make a dihedral angle of 33.87 (9)° and intramolecular N—H...O and C—H...O hydrogen bonds occur. All the amino H atoms are involved in N—H...O hydrogen bonds. These hydrogen bonds link the ionic units into a three-dimensional network. In addition, the crystal structure also features weak C—H...O interactions