ESR and Optical Studies of Acyl Radicals Produced from Acyl Chlorides by Dissociative Electron Attachment in γ-Irradiated Organic Glasses at 77°K

Publisher Website
Google Scholar
Abstract
Dissociative electron attachment by acyl chlorides in γ-irradiated organic glasses at 77°K has been investigated by ESR and optical absorption measurements. The MTHF and 3MP glasses containing acyl chlorides (CH3COCl, C2H5COCl, C6H5CH2COCl, C6H5COCl, C6H5CH=CHCOCl) display a similar ESR singlet. 3-Methylpentane glass containing CH3COCl exhibits an ESR singlet or triplet depending upon solute concentration. γ-irradiated MTHF glasses containing these solutes give the optical absorption spectra having the characteristic absorption bands in the visible and uv region. These ESR and optical absorption spectra have been assigned to acyl radicals. Illumination of γ-irradiated samples with visible light yields alkyl radicals from CH3CO· and C2H5CO·, benzyl radicals from C6H5CH2CO·, and brings about no change in C6H5CO· and C6H5CH=CHCO·. The decay of alkyl radicals formed in 3MP has been measured at 77°K.