Synthesis and structural features of copper(II) complexes of N,N,N′,N′-tetramethylethylenediamine with 2-chlorobenzoate¹⁻ and 2-hydroxybenzoate¹⁻

Abstract

Two copper(II) coordination complexes, formulated as [Cu(tmen)(ClBA)2] (1) and [Cu(tmen)(Hsal)2.H2O] (2), (where tmen = N,N,N′,N′-tetramethylethylenediamine (C6H16N2), ClBA = 2-chlorobenzoate (C7H4ClO2 1-) and Hsal 1-(C7H5O3 1-) = monoanion of o-hydroxybenzoic acid (salicylic acid), have been synthesized and characterized by elemental combustion analysis, spectroscopic techniques, thermal studies and single crystal X-ray analyses. The complex (1) consists of two distinct monomeric units in which coordination environment around the central copper(II) ion is a distorted octahedron with CuN2O4 chromophore, constituted by; a chelating tmen molecule, and two 2-chlorobenzoate 1anions coordinated through their carboxylate-O atoms in an asymmetrical bidentate fashion. The complex (2), is also a monomer and consists of CuN2O3 chromophore, in which tmen is coordinated to Cu(II) through its two N atoms in a chelating bidentate fashion, an aqua-O and the two o-hydroxybenzoate 1-(HSal 1-) anions coordinated through one of their carboxylate-O atoms in a monodentate mode, forming a square pyramidal structure. Hydrogen bonding interactions especially of O-HO, N-HO, and C-HCl types interweave monomeric units and stabilize the overall crystal structures in both complexes. Thermal analysis and antibacterial activities of 1 and 2, against various bacterial strains are also investigated.

Analyzing the physic-chemical properties of Gallaorol springs is the basis for creating their ecological passport (Uzbekistan)

“…There are a lot of drinking and irrigation springs in Gallaorol district of Jizzakh region. The water of some springs is 10-15 liters per second, and most of them have healing properties, it has been proved by the results of our research [9]. In order to properly use some springs in Gallaorol district, the study of the hydrogeological conditions of the spring areas [10], the processes of spring formation, the composition of water and the amount of water released is considered to have an important scientific and practical nature.…”

Antimicrobial and Bioinformatic Modelling Studies of Isatin Mixed Ligand and Some Ternary Chelates

“…This shift can be accounted for the participation of oxygen of amide group in the complexes. TMEDA ligand has characteristic peak at 1214 cm −1 corresponding to υ(C−N) [25] . The peaks of stretching vibrations of R−N−(CH 3 ) 2 and C−N of TMEDA ligand were changed and shifted to lower and higher values and were appeared at 1401–1417 cm −1 (1413 cm −1 in the free TMEDA) and 1193–1225 cm −1 (1214 cm −1 in the free TMEDA) in the IR spectra for all complexes.…”

“…TMEDA ligand has characteristic peak at 1214 cm À 1 corresponding to υ(CÀ N). [25] The peaks of stretching vibrations of RÀ NÀ -(CH 3 ) 2 and CÀ N of TMEDA ligand were changed and shifted to lower and higher values and were appeared at 1401-1417 cm À 1 (1413 cm À 1 in the free TMEDA) and 1193-1225 cm À 1 (1214 cm À 1 in the free TMEDA) in the IR spectra for all complexes. This shift in peak position was accounted to the coordination of nitrogen atom of TMEDA to the metal ions.…”

Recent Studies on the Antimicrobial Activity of Copper Complexes

“…The rest of the strains, B. spizizenii, K. pneumonia, and S. aureus, and the fungal strain A. niger showed no activity. For comparison, the authors [16] references to their previous works [17][18][19], in which study of copper(II)-Tmen-carboxylates complexes. In general, it can be concluded that coordination polymer 6b is significantly inferior to mononuclear analogs (for example, 6a) in antimicrobial activity.…”