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Metal-metal bond formation by a cobaltadithiolene complex was observed for the first time in the reaction of Co(η(5) -C5 H5 )(S2 C6 H4 ) with Mo(CO)3 (py)3 and BF3 to give the Co-Mo-Co cluster 1. Cyclic voltammetry reveals that 1 undergoes two one-electron reduction steps at the Co centers, which is indicative of transmission of the Co-Co electronic interaction through the Mo center.
Nihei et al. (1999) studied this question.