title: H-bonding and steric effects on the properties of phenolate and phenoxyl radical complexes of Cu(II).
abstract: Herein, the N-R substituted N,O-phenol-pyrazole redox-active pro-ligands, (R)LH (R = Me, Pr) are reported together with their corresponding bis-Cu(R)L(2) complexes (2 and 3, respectively). The latter are reversibly oxidised to the corresponding stable Cu(II)-phenoxyl radical complexes 2(+) and 3(+). The properties of the tetrahedrally distorted complexes 2 and 3 (and those of 2(+) and 3(+)) are being compared to those of the square-planar H-bonded complex 1 (bis-Cu(H)L(2)) and those of 1(+). These studies have permitted H-bonding and steric effects on the redox, spectroscopic and chemical properties of Cu(II)-phenolate and Cu(II)-phenoxyl radical species to be established.
authors.affiliation: Department of Chemistry, Bar-Ilan University, Ramat Gan, 52 900, Israel.
authors.forename: Galina M
authors.initials: GM
authors.lastname: Zats
authors.forename: Himanshu
authors.initials: H
authors.lastname: Arora
authors.forename: Ronit
authors.initials: R
authors.lastname: Lavi
authors.forename: Dmitry
authors.initials: D
authors.lastname: Yufit
authors.forename: Laurent
authors.initials: L
authors.lastname: Benisvy
mesh_terms: D056831:Coordination Complexes / Q000737:chemistry*; D003300:Copper / Q000737:chemistry*; D018360:Crystallography, X-Ray; D006860:Hydrogen Bonding; D062385:Hydroxybenzoates / Q000737:chemistry*; D008968:Molecular Conformation; D010084:Oxidation-Reduction; D010636:Phenols / Q000737:chemistry*
chemical_list: D056831:Coordination Complexes; D062385:Hydroxybenzoates; D010636:Phenols; C042329:phenoxy radical; D003300:Copper; C017616:phenolic acid