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Avoidance of a metal–metal bond is a significant factor favoring the formation of the nonanuclear cobalt complex [CO9(chp)18] (framework depicted on the right; chp = 6-chloro-2-pyridonate). The complex is homoleptic, which is unusual for 3d-complexes of pyridonates, and this contrasts with the similar, but heteroleptic, nickel double adamantane frameworks also reported.
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Brechin et al. (1997) studied this question.
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