Crystal structure of [Me3NCH2Ph][Fe4(CO)13H]. A ‘butterfly’ metal cluster with an unusually bonded carbonyl group

Abstract
A single-crystal X-ray analysis has shown the [Fe4(CO)13H] anion to contain a butterfly arrangement of metal atoms; twelve carbonyl groups are terminally bonded, three to each iron atom, whereas the thirteenth carbonyl group interacts with all the four iron atoms and behaves as a four-electron ligand.

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