Dynamic ligation at the first amine-coordinated iron hydrogenase active site mimic

The first model of the iron hydrogenase active site has been prepared in which an amine ligand is loosely coordinated to an Fe-I centre, and can be replaced by a solvent molecule; irrespective of the ligand set, the one electron reduction of both complexes is chemically reversible and is shown to proceed through the same species which features a bridging CO ligand.