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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 7, Number 6
BKCSDE 7(6)
June 20, 1986 

 
Title
Photophysical Properties of Khellin-Dimethylfumarate C4-Cyclomonoadduct
Author
Sang Chul Shim*, Ho Kwon Kang
Keywords
Abstract
The fluorescence intensity of khellin-dimethylfumarate C4-cycloadduct (KDF) is very sensitive to temperature and to the nature of solvents, especially hydrogen-bonding ability. The fluorescence quantum yields of KDF in ethanol and isopentane at 77K are 0.73 and 0.54, respectively, both of which are much larger than the room temperature values. The phosphorescence lifetime is very long and decreases with decreasing the solvent polarity. The phosphorescence and fluorescence quantum yield ratio is very small and decreases with decreasing solvent polarity. The solvent relaxation plays an important role in the excited states of KDF. The internal conversion is a major decay process of the excited singlet state of KDF in all the solvents used at room temperature.
Page
458 - 461
Full Text
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