We report the synthesis and characterization of a μ-hydroxo NiRu complex as a model for the active site of (Ni-SIr)I of [NiFe]hydrogenase. This is the first example of the (Ni-SIr)I model with a bridging hydroxo ligand between dimetal centers and an available coordination site on Ni center cis to the bridging hydroxo ligand. We have determined the structure of the (Ni-SIr)I model complex by X-ray analysis and reported reversible switching between the catalytically inactive (Ni-SIr)I and a catalytically active (Ni-SIr)II models.
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