Two new isomeric copper(II) complexes: Syntheses, spectroscopic characterization, single crystal X-ray structure determination and packing analyses of [Cu(L1/L2)2 (TEMED)], where L1= 4-chloro-2-nitrobenzoate, L2= 5-chloro-2-nitrobenzoate and TEMED = N,N,N′,N′-tetramethylethylenediamine

Crystal structure and Hirshfeld surface analysis of a new mononuclear copper(II) complex: [bis-(pyridin-2-yl-κN)amine](formato-κO)(m-hy-droxy-benzoato-κ2O,O')copper(II)

A new mononuclear copper(II) complex, [Cu(C7H5O3)(HCO2)(C10H9N3)], containing mixed N- and O-donor ligands, 2,2'-di-pyridyl-amine (dpyam) and m-hy-droxy-benzoate (m-OHbenz), has been obtained from a solvent mixture. The coordination environment of the CuII ion is distorted square-pyramidal with a [N2O3] coordination set originating from the chelating dpyam and m-OHbenz ligands in the basal plane and the O atom of a formato ligand at the apical position. The crystal structure of the title complex is stabilized by N-H⋯O, O-H⋯O, C-H⋯O hydrogen-bonding, π-π and C-H⋯π inter-molecular inter-actions, which were qu-anti-fied by Hirshfeld surface analysis.

Synthesis, crystal structure and Hirshfeld surface analysis of a copper(II) complex involving 3-methyl-benzoate and 2,2'-bi-pyridine ligands

3-Methyl-benzoic acid (3-mbH) and 2,2'-bi-pyridine (bipy) reacted with a cop-per(II) salt forming a new mixed ligand complex, aqua-(2,2'-bi-pyridine-κ2 N,N')bis-(3-methyl-benzoato)-κ2 O,O';κO-copper(II) 0.68-hydrate, [Cu(C8H7O2)2(C10H8N2)(H2O)]·0.68H2O or [Cu(3-mb)2(bipy)(H2O)]·0.68H2O. The coord-ination environment of CuII is a distorted octa-hedron. The metal atom is attached to two 3-mb moieties, which bind in monodentate and bidentate fashions. One of the 3-mb units is disordered. The coordination environment is completed by one bipy ligand and a water mol-ecule. A second water mol-ecule is outside the coordination sphere of the CuII atom and its occupancy refined to 0.68. The structure consists of chains along the b-axis direction formed by complex units joined via hydrogen bonds between the coordinated water mol-ecule and an O atom of a coordinated 3-mb unit. Hirshfeld surface analysis indicates that the most abundant contacts are H⋯H (56.8%), H⋯C/C⋯H (21.7%) and H⋯O/O⋯H (13.7%).

New copper(ii) complexes of the anti-inflammatory drug mefenamic acid: a concerted study including synthesis, physicochemical characterization and their biological evaluation

The interaction of three newly synthesized copper(ii) mefenamate complexes with bovine/human serum albumin was studied by fluorescence emission spectroscopy.