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Interaction between Molecular Oxygen and Nitroxide Radicals: A Search for a Reversible Complex

✍ Scribed by Alberto Moscatelli; M. Francesca Ottaviani; Waldemar Adam; Anatoly Buchachenko; Steffen Jockusch; Nicholas J. Turro

Publisher
John Wiley and Sons
Year
2006
Tongue
German
Weight
196 KB
Volume
89
Category
Article
ISSN
0018-019X

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✦ Synopsis

Abstract

At high concentrations of oxygen, the EPR spectrum of the nitroxide radical 4‐oxo‐TEMPO (= 4‐oxo‐2,2,6,6‐tetramethylpiperidin‐1‐yloxy) is found to broaden significantly. In addition to the expected broadening, double integration of the EPR signals indicates that a significant fraction of the nitroxide spins has ‘disappeared’. In perfluoro(2‐butyltetrahydrofuran) at 273 K, the extent of diminution of the EPR signal intensity is ca. 20%. The results are analyzed in terms of collision and supramolecular complexes between oxygen and 4‐oxo‐TEMPO. It is concluded that a supramolecular complex is responsible for the observed phenomenon.

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