title: The structure, magnetism and EPR spectra of a (μ-thiophenolato)(μ-pyrazolato-N,N') double bridged dicopper(II) complex.
abstract: A new binuclear copper(ii) complex, namely [Cu2L(pz)(DMSO)], where L = 2,6-bis[(2-phenoxy)iminomethyl]-4-methylthiophenolate(3-) and pz = pyrazolate ligand, has been synthesized by a one-pot synthesis involving copper(ii) acetate monohydrate, the S-protected ligand precursor 2-(N,N-dimethylthiocarbamato)-5-methylisophthalaldehyde di-2'-hydroxy anil, (), and pyrazole, in which a metal-promoted S-deprotection reaction occurs during the formation of the complex. This was characterized by routine physicochemical studies, single crystal X-ray diffraction and electron paramagnetic resonance (EPR) techniques. The structure analysis reveals that there are copper centres in two different environments, a slightly distorted square planar and a distorted square-pyramidal, arranged in binuclear units. The EPR study of these binuclear units performed at 9.4 GHz in the temperature range between 4 and 293 K shows an antiferromagnetic interaction between Cu(II) ions, and allows evaluating g factors gx = 2.068(1), gy = 2.091(1) and gz = 2.165(1), with <g> = 2.108(1), an exchange coupling parameter J0 = -26(1) cm(-1) (defined as ), and a zero field splitting of the ground triplet state described by D = 86(2) × 10(-4) cm(-1) and E = -48(3) × 10(-4) cm(-1). These results are discussed and compared with the existing literature.
authors.affiliation: Department of Chemistry, Sharif University of Technology, P.O. Box 11155-3516, Tehran, Iran. dboghaei@sharif.ir.
authors.forename: Narjes
authors.initials: N
authors.lastname: Khadir
authors.forename: Davar M
authors.initials: DM
authors.lastname: Boghaei
authors.forename: Abdeljalil
authors.initials: A
authors.lastname: Assoud
authors.forename: Otaciro R
authors.initials: OR
authors.lastname: Nascimento
authors.forename: Amanda
authors.initials: A
authors.lastname: Nicotina
authors.forename: Luis
authors.initials: L
authors.lastname: Ghivelder
authors.forename: Rafael
authors.initials: R
authors.lastname: Calvo
mesh_terms: D003300:Copper / Q000737:chemistry*; D018360:Crystallography, X-Ray; D004578:Electron Spin Resonance Spectroscopy; D060328:Magnetic Phenomena; D008958:Models, Molecular; D008968:Molecular Conformation; D009942:Organometallic Compounds / Q000737:chemistry*; D011720:Pyrazoles / Q000737:chemistry*
chemical_list: D009942:Organometallic Compounds; D011720:Pyrazoles; C031280:pyrazole; D003300:Copper