Search

A monomeric ternary complex [Cu(tmen)(mef)2] (1) (where mef = mefenamate anion (C15H15NO21−, tmen = N,N,N′,N′-tetramethylethylenediamine) is prepared by the reaction of CuCl2·2H2O, mefenamic acid (mefH = 2-(2,3-dimethylphenyl)aminobenzoic acid), and N,N,N′,N′-tetramethylethylenediamine (tmen) in the presence of sodium hydroxide. Complex 1 is characterized by the elemental combustion analysis, UV-visible and FT–IR spectroscopy, thermal analysis, and single crystal X-ray diffraction. From the crystal structure of complex 1, it is evident that each copper(II) ion is six-coordinate and is bonded to chelating tmen, and four O atoms of two mef anions (mef1–). In the crystal, the intramolecular hydrogen bonding exists between the H atom of the –NH group of mef and the O atom of one of the coordinated carboxylate O atoms, belonging to the same mef ligand. Complex 1 is tested for antibacterial properties against four strains, including Staphylococcus aureus, Bacillus spizizenii, Escherichia coli, and Klebsiella pneumonia. The complex shows a biological activity against Staphylococcus aureus and Bacillus spizizenii. [ABSTRACT FROM AUTHOR]

A new mixed-ligand one-dimensional copper(II) coordination polymer [Cu(en)(sal)Cl] where en = ethylenediamine(CHN) and Hsal = 2-hydroxybenzoic acid (salicylic acid; CHO) is synthesized and characterized by FTIR spectroscopy and single crystal X-ray diffraction. The structure contains Cu ions in two different distorted octahedral coordination environments: an axially extended CuNCl moiety arising from a pair of bidentate en ligands and a CuOCl moiety arising from a pair of asymmetrically coordinated sal anions. The chloride ions bridge the copper ions into a zigzag chain propagating in [001]. The structure is consolidated by N-H•••O and N-H•••Cl hydrogen bonds which generate a layered network. Crystal data: CHClCuNO, M = 296.20, monoclinic, P2/ c, a = 13.9179(10) Å, b = 10.4900(8) Å, c = 8.5181(6) Å, β = 105.518(4)°, V = 1198.30(15) Å, Z = 4, R( F) = 0.026, w R( F ) = 0.068. [ABSTRACT FROM AUTHOR]

A new mixed-ligand copper(II) complex of 1,10-phenanthroline (phen) and benzoate ligands having the general formula [Cu(phen)(CHCO)] is prepared and its crystal structure is determined by X-ray crystallography. The complex exists in the monomeric form; the coordination environment around the copper(II) ion is square planar, with the pair of monodentate benzoate ligands being in a cis disposition. In the crystal, the molecules are linked into [001] chains by weak C-H⋯O interactions; no aromatic π-π stacking occurs. [ABSTRACT FROM AUTHOR]