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- W1977025903 abstract "The fluorescence and phosphorescence spectra and phosphorescence lifetimes of 1-methyl-4-amino-5H-[1]benzopyrano[3,4-c]pyridin-5-one (1-MBPP) and 2-methyl-4-amino-5H-[1]benzopyrano[3,4-c]pyridin-5-one (2MBPP) have been measured in hydrocarbon and hydroxylic rigid-glass matrix at 77 K. The emission polarization measurements in the ethanol—methanol (volume ratio, 5:1) rigid-glass matrix at 77 K provide evidence that the lowest triplet in the 1- and 2-MBPP molecules is π,π*. The phosphoresescence bands are negatively polarized for these molecules and the coupling scheme appears to be 1n,π*3π,π*. The emission and u.v. absorption spectral measurements in the 3-methylpentane and isopentane—methylcyclohexane (volume ratio 5:1) glass indicate the existence of an associated molecule at low temperature. The fluorescence quantum yields of 1-MBPP and 2-MBPP were also measured at room temperature in hydrocarbon and hydroxylic solvents. The fluorescence quantum yields of these molecules are larger in hydroxylic solvents than in hydrocarbon solvents." @default.
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- W1977025903 date "1982-01-01" @default.
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- W1977025903 title "Emission spectra, polarization, and molecular association of 1-and 2-methyl-4-amino-5H-[1]benzopyrano[3,4-c]pyridin-5-one in rigid-glass matrix" @default.
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- W1977025903 doi "https://doi.org/10.1016/0584-8539(82)80030-5" @default.
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