Picosecond kinetics of state-selective singlet oxygen producing photochemistry of aromatic endoperoxides
✍ Scribed by E.V. Sitzmann; J.G. Langan; D.A. Hrovat; K.B. Eisenthal
- Publisher
- Elsevier Science
- Year
- 1989
- Tongue
- English
- Weight
- 472 KB
- Volume
- 162
- Category
- Article
- ISSN
- 0009-2614
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✦ Synopsis
Picosecond measurements show that the photo-fragmentation of anthraccne endoperoxides leading to the anthracene moiety and singlet oxygen does not occur in a single step, but involves a short-lived intermediate. The upper excited state dual bond dissociation kinetics of the endoperoxides of 9,lOdiphenylanthracene (9, I 0-DPA-01) and of 9-phenylanthracene (9,10-PA-O*) were measured. For 9,10-DPA-O2 the ground state aromatic appears in 95 + 10 ps, whereas for 9,10-PA-O2 it appears in 60&7 ps. The results arc consistent with our earlier proposed mechanism for the dissociation from the upper excited singlet states of isomers of the anthracene endoperoxidcs