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Preparation and Characterization of a Microcrystalline Non‐Heme Fe III (OOH) Complex Powder: EPR Reinvestigation of Fe III (OOH) Complexes—Improvement of the Perturbation Equations for the g Tensor of Low‐Spin Fe III
Author(s) -
Martinho Marlène,
Dorlet Pierre,
Rivière Eric,
Thibon Aurore,
Ribal Caroline,
Banse Frédéric,
Girerd JeanJacques
Publication year - 2008
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.200701592
Subject(s) - microcrystalline , electron paramagnetic resonance , chemistry , analytical chemistry (journal) , perturbation (astronomy) , crystallography , materials science , inorganic chemistry , nuclear chemistry , nuclear magnetic resonance , physics , organic chemistry , quantum mechanics
The first example of a microcrystalline powder of a synthetic low‐spin (LS) mononuclear Fe III (OOH) intermediate has been obtained by the precipitation of the [Fe III (L 5 2 )(OOH)] 2+ complex at low temperature. The high purity of this thermally unstable powder is revealed by magnetic susceptibility measurements. EPR studies on this complex, in the solid state and also in frozen solution, are reported and reveal the coexistence of two related Fe III (OOH) species in both states. We also present a theoretical analysis of the g tensor for LS Fe III complexes, based on new perturbation equations. These simple equations provide distortion‐energy parameters that are in good agreement with those obtained by a full‐diagonalization calculation.