Pj. Modi et al., PHOTOCHEMISTRY OF 9-ANTHRACENYLMETHYL-9'-FLUORENYL KETONE, Journal of photochemistry and photobiology. A, Chemistry, 81(2), 1994, pp. 87-91
The photolysis of the unsymmetric aromatic ketone 9-anthracenylmethyl-
9'-fluorenyl ketone (AFK) was studied using steady state and laser fla
sh photolysis. Product studies from steady state illumination suggest
that the compound photolyses from the singlet state by an inefficient
Norrish type I process (psi almost-equal-to 0.01) to give anthrylmethy
l, fluorenyl formyl and fluorenyl radicals which abstract protons from
the solvent or recombine to give the expected products. The main prod
uct observed on flash photolysis is a transient with an absorption max
imum at 423 nm and a lifetime of approximately 24 mus. On the basis of
quenching studies, this species is believed to be triplet AFK formed
by rapid intersystem crossing of the singlet.