Facile Nitrite Reduction and Conversion Cycle of {Fe(NO)}6/7 Species: Chemistry of Iron N-Confused Porphyrin Complexes via Protonation/Deprotonation

Facile nitrite reduction was achieved using [Fe-II(HCTPPH)NO] as the starting compound to react-with NaNO2. Stoichiometric studies allow the isolation of both {Fe(NO)}(6) and {Fe(NO)}(7) nitrosyl complexes and provide insight into the proton and electron transfer processes during the nitrite reduction. Treating [Fe(CTPP)NO] with acid or oxidizing [Fe(HCTPP)NO] with AgClO4 yields intermediate [Fe(HCTPP)NO](+). The conversion cycles starting from {Fe(NO)}(6) [Fe(CTPP)NO] to {Fe(No)}(6) [Fe(HCTPP)NO][ClO4] then to {Fe(NO)}(7) [Fe(HCTPP)NO] and vice versa were constructed.