Fluorescence emission and photooxidation studies with 5, 6-and 6, 7-benzocoumarins and a 5, 6-benzochromone under direct and concentrated sun light
C Karapire, H Kolancilar, Ü Oyman, S Icli - Journal of Photochemistry and …, 2002 - Elsevier
4-Methyl-8-hydroxy-benzo (6, 7) coumarin, I, 4-methyl-6-hydroxy-benzo (5, 6) coumarin, II,
and 2-methyl-6-hydroxy-benzo (5, 6) chromone, III, have shown similar absorption and
fluorescence emission spectra. Fluorescence emission quantum yields for I and III are found
to be very low, φf= 0.02, but 4-methyl-6-hydroxy-benzo (5, 6) coumarin, II, has a eight-fold
higher fluorescence quantum yield of the other two specie, in acetonitrile solution, φf= 0.16.
Quenching of anthracene fluorescence emission by I, II and III are found to give kq values of …
and 2-methyl-6-hydroxy-benzo (5, 6) chromone, III, have shown similar absorption and
fluorescence emission spectra. Fluorescence emission quantum yields for I and III are found
to be very low, φf= 0.02, but 4-methyl-6-hydroxy-benzo (5, 6) coumarin, II, has a eight-fold
higher fluorescence quantum yield of the other two specie, in acetonitrile solution, φf= 0.16.
Quenching of anthracene fluorescence emission by I, II and III are found to give kq values of …
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