Abstract
AbstractThree novel cobalt compounds with bis(diphenylphosphanyl)ethane (dppe) and semiquinone and catecholate ligands were synthesized and investigated by EPR spectroscopy in solution. They are: [(dppe)Co(3,6‐DBSQ)(CatClox)] (1), [(dppe)Co(3,6‐DBCat)(phen‐SQ)] (2), and [(dppe)Co(3,6‐DBSQ)2] (3), where 3,6‐DBSQ and 3,6‐DBCat are the radical anion and dianion of 3,6‐di‐tert‐butyl‐o‐benzoquinone, respectively, CatClox is the dianion of perchloroxanthrenequinone‐2,3, and phen‐SQ is the radical anion of phenanthrenequinone. According to the ratio of the redox potentials of the o‐quinone fragments, 1 and 2 are mixed semiquinone‐catecholate complexes, and the 3,6‐di‐tert‐butyl‐o‐quinone fragment appears as a semiquinone in 1 and as a catecholate in 2. Compound 3 exists as a mixture of redox isomers, namely semiquinone‐catecholate and bis‐semiquinone species. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003)
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