Electron Spin Resonance Spectra of RSO2 Radicals Formed by the X Radiolysis of Sulfones

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Abstract
X irradiation of single crystals of dibenzyl sulfone yields the PhCH 2 S · O 2 radical while irradiation of PhSO2CH2COOH, PhSO2CH3, and PhSO2Ph yields the PhS · O 2 radical. The principal values of the g and 33S hyperfine coupling tensors were measured ( PhCH 2 S · O 2 : g=2.0027, 2.0056, 2.0094; A 33 S =96.3, 63.4, 56.2 G ; PhS · O 2 : g=2.0023, 2.0051, 2.0072; A 33 S =107.1, 71.3, 71.3 G ) and are discussed in terms of the electronic structure of these species. In PhSO2CH2COOH a further radical, g=1.89, 1.98, 2.04 , is observed at low temperatures and is probably a trapped electron.