title: Spectroscopic, solvent influence and thermal studies of ternary copper(II) complexes of diester and dinitrogen base ligands.
abstract: New mixed-ligand copper(II) complexes containing the bidentate dinitrogen ligands [N,N,N',N'-tetramethylethylenediamine (tmen), 2,2'-bipyridine (bipy) and 1,10-phenanthroline (phen)] and the bidentate dioxygen ligands [diethylmalonate (DEM), ethylacetoacetate (EAA) and ethylbenzoylacetate (EBA)] were prepared. The complexes were characterized by elemental analysis, infrared, mass and ESR spectral data, magnetic and molar conductance measurements and thermal gravimetric analysis. From the investigation, the geometries of the complexes are square planar for perchlorate complexes and a square pyramid or octahedral for the nitrate complexes. Solvatochromic behavior of the Cu(II) complexes indicates strong solvatochromism of their solutions in polar and non-polar solvents. The observed solvatochromism is due to the solute-solvent interaction between the chelate cation and the solvent molecules.
authors.affiliation: Department of Chemistry, Ain Shams University, Roxy, Cairo, Egypt. adelaaemara@yahoo.com
authors.forename: Adel A A
authors.initials: AA
authors.lastname: Emara
authors.forename: Azza A A
authors.initials: AA
authors.lastname: Abu-Hussein
authors.forename: Ahmed A
authors.initials: AA
authors.lastname: Taha
authors.forename: Nelly H
authors.initials: NH
authors.lastname: Mahmoud
mesh_terms: D000090:Acetoacetates / Q000737:chemistry*; D056831:Coordination Complexes / Q000138:chemical synthesis / Q000737:chemistry*; D003300:Copper / Q000737:chemistry*; D004578:Electron Spin Resonance Spectroscopy; D005029:Ethylenediamines / Q000737:chemistry*; D008401:Gas Chromatography-Mass Spectrometry; D008024:Ligands; D008314:Malonates; D008958:Models, Molecular; D010618:Phenanthrolines / Q000737:chemistry*; D012997:Solvents / Q000494:pharmacology; D013055:Spectrophotometry, Infrared; D013056:Spectrophotometry, Ultraviolet; D017550:Spectroscopy, Fourier Transform Infrared; D013818:Thermogravimetry
chemical_list: D000090:Acetoacetates; D056831:Coordination Complexes; D005029:Ethylenediamines; D008024:Ligands; D008314:Malonates; D010618:Phenanthrolines; D012997:Solvents; C005798:N,N,N',N'-tetramethylethylenediamine; C498810:diethyl malonate; D003300:Copper; C024840:ethyl acetoacetate; C025205:1,10-phenanthroline