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Characterization of a Nonheme Mononuclear Peroxoiron(III) Intermediate by UV/Vis and EPR Spectroscopy and Mass Spectrometry
Author(s) -
Simaan Ariane Jalila,
Banse Frédéric,
Mialane Pierre,
Boussac Alain,
Un Sun,
KargarGrisel Taraneh,
Bouchoux Guy,
Girerd JeanJacques
Publication year - 1999
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/(sici)1099-0682(199906)1999:6<993::aid-ejic993>3.0.co;2-6
Subject(s) - chemistry , mass spectrometry , electron paramagnetic resonance , characterization (materials science) , spectroscopy , nuclear magnetic resonance spectroscopy , analytical chemistry (journal) , organic chemistry , nanotechnology , nuclear magnetic resonance , chromatography , physics , quantum mechanics , materials science
Some nonheme hydroperoxoiron(III) species have been recently characterized by several groups. The reported examples were obtained by adding H 2 O 2 in excess to an Fe II complex with a neutral polypyridine ligand. We show here that on deprotonation, the purple low‐spin hydroperoxoiron(III) complex [L 5 Fe III OOH] 2+ [L 5 = N ‐methyl‐ N,N′,N′ ‐tris(2‐pyridylmethyl)ethane‐1,2‐diamine] gives a blue high‐spin species which we characterized as the η 2 ‐peroxoiron(III) species [L 5 Fe III O 2 ] + . It seems that with such an auxiliary ligand, the hydroperoxo group is acidic in contrast with its basicity when it is coordinated to a heme group.