title: Synthesis, spectroscopy, magnetic and redox behaviors of copper(II) complexes with tert-butylated salen type ligands bearing bis(4-aminophenyl)ethane and bis(4-aminophenyl)amide backbones.
abstract: New salen type ligands, N,N'-bis(X-3-tert-butylsalicylidene)-4,4'-ethylenedianiline [(X=H (1), 5-tert-butyl (2)] and N,N'-bis(X-3-tert-butylsalicylidene)-4,4'-amidedianiline [X=H (3), 5-tert (4)] and their copper(II) complexes 5-8, have been synthesized. Their spectroscopic (IR, (1)H NMR, UV/vis, ESR) properties, as well as magnetic and redox-reactivity behavior are reported. IR spectra of 7 and 8 indicate the coordination of amide oxygen atoms of 3 and 4 ligands to Cu(II). The solid state ESR spectra of 5-8 exhibits less informative exchange narrowed isotropic or anisotropic signals with weak unresolved low field patterns. The magnetic moments of 5 (2.92 μ(B) per Cu(II)) and 6 (2.79 μ(B) per Cu(II)) are unusual for copper(II) complexes and considerably higher than those for complexes 7 and 8. Cryogenic measurements (300-10 K) show weak antiferromagnetic exchange interactions between the copper(II) centers in complexes 6 and 8. The results of electrochemical and chemical redox-reactivity studies are discussed.
authors.affiliation: Department of Chemistry, Harran University, Osmanbey, 63300 Şanlıurfa, Turkey. vkasumov@harran.edu.tr
authors.forename: Veli T
authors.initials: VT
authors.lastname: Kasumov
authors.forename: Yusuf
authors.initials: Y
authors.lastname: Yerli
authors.forename: Aysegul
authors.initials: A
authors.lastname: Kutluay
authors.forename: Mehmet
authors.initials: M
authors.lastname: Aslanoglu
mesh_terms: D000577:Amides / Q000737:chemistry*; D000814:Aniline Compounds / Q000737:chemistry*; D001632:Bibenzyls / Q000737:chemistry*; D056831:Coordination Complexes / Q000138:chemical synthesis* / Q000737:chemistry; D003300:Copper / Q000737:chemistry*; D004126:Dimethylformamide / Q000737:chemistry; D055664:Electrochemical Techniques; D004578:Electron Spin Resonance Spectroscopy; D004583:Electrons; D004980:Ethane / Q000737:chemistry*; D005029:Ethylenediamines / Q000138:chemical synthesis* / Q000737:chemistry*; D008024:Ligands; D060328:Magnetic Phenomena; D009682:Magnetic Resonance Spectroscopy; D008968:Molecular Conformation; D010084:Oxidation-Reduction; D013055:Spectrophotometry, Infrared; D013056:Spectrophotometry, Ultraviolet; D013696:Temperature
chemical_list: D000577:Amides; D000814:Aniline Compounds; D001632:Bibenzyls; D056831:Coordination Complexes; D005029:Ethylenediamines; D008024:Ligands; C582218:bis(4-aminophenyl)ethane; C030819:4,4'-diaminodibenzyl; D003300:Copper; D004126:Dimethylformamide; C011452:disalicylaldehyde ethylenediamine; D004980:Ethane