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.
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