A. Moscatelli, M. Ottaviani, W. Adam*
Oct 1, 2006
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0
Influential Citations
8
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Journal
Helvetica Chimica Acta
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.