title: Up to four phenoxyl radicals coordinated to two metal ions in copper and zinc complexes?
abstract: Neutral copper(II) and zinc(II) complexes of the mono- and dinucleating Schiff base ligands (2,4-di-tert-butyl-6-({2-[(3,5-di-tert-butyl-2-hydroxy-benzylidene)-amino]-phenylimino}-methyl)-phenol) and (2,4-di-tert-butyl-6-({2,4,5-tri-[(3,5-di-tert-butyl-2-hydroxy-benzylidene)-amino]-phenylimino}-methyl)-phenol) respectively were synthesized and characterized. The monometallic complex can be oxidized into a mono and a dication, while oxidation of the dimetallic one affords up to a tetracation. Whatever the ligand and metal are, oxidation takes place at the phenolate moieties, which were oxidized into coordinated phenoxyl radicals, i.e. the oxidation locus is not correlated to the ligand nuclearity. These results could be rationalized with previous ones by considering the hybridization of the coordinating nitrogens and the nature of the O-donor groups.
authors.affiliation: Département de Chimie Moléculaire-Chimie Inorganique Redox Biomimétique (CIRE) UMR CNRS 5250, Université Joseph Fourier, BP 53, 38041, Grenoble cedex 9. France.
authors.forename: Olaf
authors.initials: O
authors.lastname: Rotthaus
authors.forename: Olivier
authors.initials: O
authors.lastname: Jarjayes
authors.forename: Fabrice
authors.initials: F
authors.lastname: Thomas
authors.forename: Christian
authors.initials: C
authors.lastname: Philouze
authors.forename: Eric
authors.initials: E
authors.lastname: Saint-Aman
authors.forename: Jean-Louis
authors.initials: JL
authors.lastname: Pierre
mesh_terms: D001593:Benzyl Compounds / Q000138:chemical synthesis / Q000737:chemistry*; D002413:Cations, Divalent; D003300:Copper / Q000737:chemistry*; D003461:Crystallography; D004563:Electrochemistry; D004578:Electron Spin Resonance Spectroscopy; D008024:Ligands; D009942:Organometallic Compounds / Q000737:chemistry*; D010084:Oxidation-Reduction; D010636:Phenols / Q000138:chemical synthesis / Q000737:chemistry*; D015032:Zinc / Q000737:chemistry*
chemical_list: C520035:(2,4-di-tert-butyl-6-((2,4,5-tri-((3,5-di-tert-butyl-2-hydroxy-benzylidene)-amino)-phenylimino)-methyl)-phenol); C520036:(2,4-di-tert-butyl-6-((2-((3,5-di-tert-butyl-2-hydroxy-benzylidene)-amino)-phenylimino)-methyl)-phenol); D001593:Benzyl Compounds; D002413:Cations, Divalent; D008024:Ligands; D009942:Organometallic Compounds; D010636:Phenols; C042329:phenoxy radical; D003300:Copper; D015032:Zinc