Detection of the Phenylsufur Radical

Abstract

These results supply information on the fine structure of the cyanines and contribute to the theoretical interpretation of these dyes. Our investigations are therefore continued on a broad basis.

Diazene-Functionalized Lamellar Materials as Nanobuilding Blocks: Application as Light-Sensitive Fillers to Initiate Radical Photopolymerizations

“…At room temperature and under irradiation, LAM-1 led to an anisotropic signal assigned to the corresponding arylsulfanyl radical. The EPR parameters of these signals (Table ) were in agreement with the formation of arylsulfanyl radicals ,, for which the g tensor is axisymmetrical and the spin density is localized on the sulfur atom . The thermal decomposition of the diazene moieties at 473 K enabled the observation of an isotropic signal with a 2.009 g -factor.…”

“…The EPR parameters of these signals (Table 1) were in agreement with the formation of arylsulfanyl radicals 5,6,14 for which the g tensor is axisymmetrical and the spin density is localized on the sulfur atom. 15 The thermal decomposition of the diazene moieties at 473 K enabled the observation of an isotropic signal with a 2.009 g-factor. The half-lifetimes of the arylsulfanyl radicals were measured graphically by monitoring the decay of the signal of highest intensity.…”

Arylsulfanyl radical lifetime in nanostructured silica: dramatic effect of the organic monolayer structure

“…As the spin density is mainly localized on the sulfur atom, recombination forming disuldes is the most likely cause of the decay of the arylsulfanyl radical signals. 35 MP2 calculations show that, in the cases of the 4-methoxy or the 4-methylureido phenylsulfanyl radical, 85% of the spin density lies on the sulfur atom. Remarkably, the data collected in Tables 1 and 2 showed that the closer the organic precursors, the higher the radical lifetimes.…”

“…The EPR parameters of these signals were in agreement with the formation of arylsulfanyl radicals, [32][33][34] for which the g tensor is axisymmetrical and the spin density is localized on the sulfur atom. 35,36 Representative spectra are shown in Fig. 1.…”

Evidence for the contribution of degenerate hydrogen atom transport to the persistence of sulfanyl radicals anchored to nanostructured hybrid materials

“…The EPR parameters of these signals were in agreement with the formation of arylsulfanyl radicals 10,11,16 for which the g tensor is axisymmetrical and the spin density is localized on the sulfur atom. 17 A representative spectrum is shown in Fig. 1a.…”