Abstract
The coordination chemistry of O 2 and O − 2 with the cobalt(II) complex of 5,7,7,12,14,14-hexamethyl-1,4,8,11-tetraazacyclotetradeca-4,11-diene was explored in dimethylsulfoxide by means of cyclic voltametry and rotating disk voltammetry. The complex forms a complex with O 2, characterized by an association constant of 54 M −1, that is reduced at potentials more positive than the formal potential of the O 2/O − 2 couple because of the high affinity of the cobalt(II) complex for O − 2. The possible relevance of the results to the catalytic reduction of O 2 by cobalt macrocyclic complexes in aqueous media is indicated.
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