Reaction of 1,4-(BBr 2 ) 2 C 6 H 4 with cobaltocene gives a bimetallic cobalt complex with cyclopentadienyl and boratabenzene ligands. Oxidation allows the dicationic dicobalt(III) complex to be isolated; the bis(hexafluorophosphate) salt has been structurally characterized. Variable-temperature magnetic susceptibility measurements on the neutral dicobalt(II) complex showed substantial deviation from the Curie−Weiss law; a fit to the Bleaney−Bowers equation for a singlet ground state and a triplet excited state gave an exchange interaction of J = ca. −28 cm - 1 . Electrochemical studies, as well as near-infrared data on the mixed-valence species, suggest that the interaction between the metal centers is weak.
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Hascall et al. (2004) studied this question.
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