Finding a new pathway for acid-induced nitrite reduction reaction: formation of nitric oxide with hydrogen peroxide

摘要

Here, we report a new pathway for nitrite reduction chemistry, formation of cobalt-nitrosyl ({Co-II-NO}(8)) with H2O2 in the reaction of a Co-II-nitrito complex with a one-fold acid (H+) via the formation of a Co-II-nitrous acid intermediate ({Co-II-ONOH}). Mechanistic investigations using N-15-labeled-(NO2-)-N-15 revealed that the N-atom in the {Co-II-NO}(8) complex is derived from the nitrito ligand, and H2O2 came from the homolysis of the ON-OH moiety. Spectral evidence supporting the formation of the Co-II-ONOH intermediate and the generation of H2O2 is also presented.