Iron diprotonated [1.1] ferrocenophane generated in super‐acid and directly observed by NMR spectroscopy

Molecular electrocatalysis at soft interfaces

“…It has been known for many years that metallocenes and ferrocenophanes 17,18 can react with organic acids to form hydrogen. In particular, Koelle et al have studied by pulse radiolysis the kinetics of proton reduction by cobaltocene.…”

The Rational Design of Time‐Dependent (“Mechanical”) Homogeneous Catalysts. A Literature Survey of Multicentered Homogeneous Catalysis

“…The lifetimes of the higher energy Fe -H species are, consequently, extremely short. NMR and other data are consistent with a tilted, non-coplanar arrangement of the rings in protonated ferrocene, suggesting that H 2 formation in diprotonated 8a may be favored by the release of steric strain [53,61].…”

“…NMR experiments confirmed the presence of two Fe -H species in protonated 8a and indicated that the Fe2 2H $ Cp C-H exchange processes are too rapid to be resolved on the NMR time scale even at 2122 8C [53,61]. The lifetimes of the higher energy Fe -H species are, consequently, extremely short.…”