1969 Volume 42 Issue 12 Pages 3369-3372
The present work was undertaken in order to examine a photochemical intermediate from benzene using rigid organic matrices: EPA (a mixture of E: diethyl ether, P: isopentane, and A: ethyl alcohol, 5:5:2, v/v), diethyl ether, and isopentane. The UV irradiation of EPA, diethyl ether, and ethyl alcohol at 77°K, in wavelength regions from approximately 2200Å to 2600Å, gave ESR spectra which can be ascribed to the ethyl and/or the ethanol radical, even when a solute was not added. On the contrary, the UV irradiation of isopentane under similar conditions did not show any ESR spectrum. However, the UV irradiation of isopentane containing benzene in concentration regions from 10−1 to 10−2 M gave two kinds of ESR spectra, ascribed to phenyl and tert-pentyl radicals. This reaction may be interpreted as a sensitized photodecomposition brought about by an excitation and/or a photolytic degradation of benzene.
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