Temperature Dependence of Fluorescence Spectra and Fluorescence Polarization of Some Organic Compounds in Polar Solvents. The Franck-Condon Excited States
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概要
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Fluorescence and absorption spectra and fluorescence polarization were measured at different temperatures, ranging from room temperature to 77°K, for 9,10-diazaphenanthrene, 2-naphthol and 2,3-naphthalenediol in polar solvents. At about 120°K, the fluorescence spectra shifted rapidly to the blue as the temperature was lowered. This observation is quantitatively interpreted on the basis of a kinetic scheme involving competitive rate processes, <I>viz.</I>, radiative transition from the Franck-Condon excited state, as defined for the dipole orientation of the solvent, and relaxation of the Franck-Condon state into the equilibrium excited state. The Franck-Condon destabilization energies are evaluated from the observed blue shifts. Along with the fluorescence blues hifts, the degrees of polarization increased rapidly, but at a somewhat higher temperature of about 140°K. This phenomenon is related to the rotational relaxation of the solute molecule, and is discussed in comparison with the fluorescence blue shift.
- 公益社団法人 日本化学会の論文
著者
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Baba Hiroaki
Division of Chemistry, Research Institute of Applied Electricity, Hokkaido University
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Mugiya Chie
Division of Chemistry, Research Institute of Applied Electricity, Hokkaido University
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