Excitation Wavelength Dependence of Excited State Intramolecular Proton Transfer Reaction of 4′-N,N-Diethylamino-3-hydroxyflavone in Room Temperature Ionic Liquids Studied by Optical Kerr Gate Fluorescence Measurement
作者： Kayo Suda , Masahide Terazima , Hirofumi Sato , Yoshifumi Kimura
DOI: 10.1021/JP405537C
关键词:
摘要: Excited state intramolecular proton transfer reactions (ESIPT) of 4′-N,N-diethylamino-3-hydroxyflavone (DEAHF) in ionic liquids have been studied by steady-state and time-resolved fluorescence measurements at different excitation wavelengths. Steady-state show the relative yield tautomeric form to normal DEAHF decreases as wavelength is increased from 380 450 nm. The decrease significant that cations with long alkyl chains. extent correlated number carbon atoms Time-resolved using optical Kerr gate spectroscopy ESIPT rate has a strong dependence. There large difference between spectra 200 ps delay wavelengths each liquid. pronounced having chain. equilibrium constant electronic excited obtained 200...
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