Abstract
The photochemical and photophysical phenomena of dibenzophenoneoxime hexamethylenediurethane have been investigated with laser flash photolysis to understand its participating mechanism in polymer curing reactions. Owing to the extremely short lifetimes of the first excited singlet (22 ps) and triplet (10 ns) (n, π *) states, that the molecules undergo, with a small quantum efficiency of 10 −4, decarboxylation at the lowest triplet state with the rate constant of 10 6 s −1, forming dehydrogenated iminyl and aminyl radicals. Abstracting a hydrogen atom in the time scale of 270 μs, the iminyl radical converts mainly into diphenyl-1-imine which, with being irradiated, dehydrogenates and dimerizes to yield benzophenone azine. Meanwhile, the aminyl radical abstracts H to generate benzophenoneoxime-urethanyl hexamethyleneamine, which, as a photobase, raises solution pH.
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Schedule a callMore From: Journal of Photochemistry & Photobiology, A: Chemistry
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