An insight into the protonation property of a diiron azadithiolate complex pertinent to the active site of Fe-only hydrogenases

Protonation of [{(mu-SCH2)2N(C6H4-p-NO2)}{Fe(CO)2(PMe3)}2] in the presence of 4 equiv. of HOTf afforded two species, a micro-hydride diiron complex, the molecular structure of which was crystallographically characterized, and a micro-S-protonated species, which was readily deprotonated in the presence of pyridine.