A proton-hydride diiron complex with a base-containing diphosphine ligand relevant to the FeFe -hydrogenase active site

• A diiron dithiolate complex holding a mu-hydride on the iron atoms and a proton on the basic site of a chelating diphosphine ligand was prepared and crystallographically characterized as a structural model of the [FeFe]-hydrogenase active site, and its molecular structure shows the H-mu(-)center dot center dot center dot H-N(+) distance is 3.934 angstrom.

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