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PHOTOPHYSICAL PROCESSES IN TROPOLONE, α‐METHOXY‐TROPONE AND COLCHICINE
Author(s) -
Croteau Robert,
Leblanc Roger M.
Publication year - 1978
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.1978.tb06926.x
Subject(s) - tropolone , tropone , photochemistry , phosphorescence , luminescence , chemistry , quantum yield , molecule , excited state , singlet state , fluorescence , colchicine , energy transfer , materials science , chemical physics , stereochemistry , atomic physics , physics , optics , organic chemistry , optoelectronics , medicine
— The spectral characteristics of the emission observed from tropolone, α‐methoxy‐tropone and colchicine in EPA at 77 K are reported. Luminescence polarization, lifetime, quantum yield and energy transfer experiments provide evidence that the luminescence observed is S 1 → S 0 fluorescence and that the lowest excited singlet state is π, π* The two compounds α‐methoxy‐tropone and colchicine have been found to exhibit dual luminescence. No phosphorescence could be detected in these three molecules. The photophysical processes for each molecule are discussed and their respective energy level diagrams are also suggested.