Title: The photolysis of pyrene and perylene in cyclohexane liquid solution from highly excited electronic states
Abstract: The photolysis of pyrene and perylene using the 185 nm and/or the 254 nm mercury line has been studied in liquid cyclohexane. Different photochemical processes, which depend on whether the excitation takes place from highly excited singlet or triplet states, are shown to be involved. Contrary to excitation into highly excited triplet states, charged species are shown to play a major role in the photodegradation of the aromatics (Ar) when they are excited into upper singlet states just above their ionization threshold. Analysis of the photoproducts resulting from the photolysis of perylene provides evidence for the formation of dihydrocyclohexenylperylene. It is suggested that the formation of this product can be traced to the previously postulated sensitized formation of this product can be traced to the previously postulated sensitized formation of a cyclohexyl cation (Cy+.) which is then rapidly converted into a cyclohexenyl cation. The possibility for the formation of ion pairs (Cy+…Ar−), as first proposed by Warman, is discussed. However, as we failed to detect these ion pairs using picosecond spectroscopy, we did not obtain experimental evidence to sustain this hypothesis.
Publication Year: 1987
Publication Date: 1987-06-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 10
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