Aquabis(2,3-butanedione dioximato-N,N')(cyclopentyl)cobalt(III)

The crystal structure determination of the title compound, a model for coenzyme B₁₂, indicates that it is [Co(C₄H₆N₂O₂)(C₅H₉)(C₄H₈N₂O₂)(H₂O)], i.e. one 2,3-butanedione dioxime ligand is neutral and the second is a dianion, with the Co^III ion in a distorted octahedral environment. The axial Co-C bond length [2.029 (2) Å] is close to that of coenzyme B₁₂[2.00 (1) Å].

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