| Abstract
| - The binding of CO to a lacunar Fe(II)cyclidene complex is characterized by very negative values for theactivation entropy and activation volume, whereas the reversedissociation reaction is accompanied by small positive activationentropy and activation volume data. The constructed volume profilesuggests that, in the transition state, CO disappears completely intothe ligand pocket during partial Fe−CO bond formation, followed by ahigh-spin to low-spin transition on Fe(II) during which the metalcenter moves into the ligand plane and accounts for the subsequentvolume decrease.
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