Abstract
The photolysis of three aryl—alkyl sulfoxide photoinitiators is studied by time-resolved laser spectroscopy. The general diagram of the excited-state process is rather unusual: it shows a dual path of photolysis. Thus, whereas the singlet state cleaves at the S-alkyl bond, the triplet generates aryl and alkyl sulfinyl radicals. The conclusions arrived at are corroborated by product analysis by the coupled gas chromatography—mass spectroscopy technique. The photoinitiated polymerization activity has been checked and compared with that of other well known photoinitiators.
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