Electrochemical transformations of catecholate and <Emphasis Type="Italic">o</Emphasis>-amidophenolate complexes with triphenylantimony(V) |
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Authors: | I V Smolyaninov A I Poddel’skiy N T Berberova V K Cherkasov G A Abakumov |
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Institution: | 1.Southern Scientific Center,Russian Academy of Sciences,Rostov-on-Don,Russia;2.Razuvaev Institute of Organometallic Chemistry,Russian Academy of Sciences,Nizhni Novgorod,Russia |
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Abstract: | The electrochemical properties of catecholate and o-amidophenolate complexes with triphenylantimony(V) with various substituents in the aromatic ring were examined. Introduction
of electron-donating groups into the catecholate ligand or replacement of an O atom (in catecholate) by a N atom (o-amidophenolate) stabilizes the monocationic forms of the complexes obtained by one-electron oxidation. Complexes with electron-withdrawing
substituents undergo irreversible two-electron oxidation resulting in the elimination of o-quinone. Complexes containing electron-withdrawing ligands do not form o-semiquinones and are inert to atmospheric oxygen. According to electrochemical data, oxygen can be bound reversibly by catecholate
complexes containing the electron-donating methoxy groups in the 3,6-di-tert-butylcatecholate ligand and o-amidophenolate derivatives with half-wave oxidation potentials lower than or equal to 0.70 V (vs. Ag/AgCl), which form relatively
stable cationic complexes upon the oxidation. |
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