Bianthrone photophysics and photochemistry: solvent heavy-atom-induced triplet state formation

The cyclization of bianthrone to helioanthrone in toluene occurs from the singlet state, since the quantum yield of intersystem crossing in this solvent is very low or zero. In bromoform, the triplet is formed and in the presence of oxygen generates singlet oxygen with a quantum yield of 0.42. A tra...

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Bibliographic Details
Published in:Journal of photochemistry and photobiology. A, Chemistry. Chemistry., 1997-07, Vol.107 (1), p.165-167
Main Authors: Nicodem, David E., da Cunha, M.Fernanda V.
Format: Article
Language:English
Subjects:
Bianthrone
Chemistry
Exact sciences and technology
General and physical chemistry
Photochemistry
Photocyclization
Physical chemistry of induced reactions (with radiations, particles and ultrasonics)
Singlet oxygen
Triplet state
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Summary:The cyclization of bianthrone to helioanthrone in toluene occurs from the singlet state, since the quantum yield of intersystem crossing in this solvent is very low or zero. In bromoform, the triplet is formed and in the presence of oxygen generates singlet oxygen with a quantum yield of 0.42. A transient absorbing at 720 nm with a lifetime of 19 μs is also observed in this solvent and is attributed to the excited triplet state.
ISSN:1010-6030
1873-2666
DOI:10.1016/S1010-6030(96)04618-7