Deprotonation of low-spin mononuclear iron(III)–hydroperoxide complexes give transient blue species assigned to high-spin iron(III)–peroxide complexes

Characterization and Properties of Non-Heme Iron Peroxo Complexes

“…Information on equilibria in solution has also been obtained as well as evidence for ligand degradation [9,10] and Fe(IV)O species [11,18].…”

“…Table 6. EPR data for high-spin S = 5/2 Fe(III)OOR complexes, ( * ) indicates that the compound presents both spin states (see Table 5 [42], TPEN [8], and Rtpen [11] (see above).…”

“…This absorption gives these complexes a purple color. Apparently, in MeOH, for the series trispicen [8], trispicMeen [9,10], TPEN [8], ettpen [11], N4py [12±14], and Py5 [15], the higher the number of pyridines coordinated to Fe(III) the lower the band is in energy:…”

Bispidine Ligand Effects on Iron/Hydrogen Peroxide Chemistry

“…[7][8][9] Deprotonation of these species affords their respective conjugate bases with lower energy charge-transfer bands; spectroscopic studies support their assignment as the corresponding high-spin Fe III side-on peroxo derivatives. To date, no crystal structures are available for any of these Fe III intermediates, so their precise structures remain to a large extent a matter of speculation.…”

Hydrocarbon Oxidation with H2O2, Catalyzed by Iron Complexes with a Polydentate Pyridine-Based Ligand

“…Others include iron(II) complexes containing pyridine-based pentadentate ligands, with two to five pyridine rings [9][10][11][12][13][14][15][16]. These complexes can react with H 2 O 2 , forming metastable Fe-OOH intermediates, and in some cases to catalyze alkane hydroxylation [11,15].…”