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Wavelength and solvent independent photochemistry: the electrocyclic ring-closure of indolylfulgides
Cordes, Thorben,Herzog, Teja T.,Malkmus, Stephan,Draxler, Simone,Brust, Thomas,Digirolamo, Jessica A.,Lees, Watson J.,Braun, Markus Korean Society of Photoscience 2009 Photochemical & photobiological sciences Vol.8 No.4
A wavelength and solvent dependent study of a photochromic indolylfulgide is presented. The ring-closure reaction is characterized using stationary and time-resolved spectroscopy with femtosecond time resolution. After excitation into the first excited singlet state ($S_1$) the photoprocesses proceed on ultrafast timescales (0.3-0.45 ps) in both polar and non-polar solvents. Excitation into higher electronic states results in similar reaction kinetics as found for $S_1$ excitation. A simple kinetic scheme can be established for the photoprocesses under all different experimental conditions: as expected from organic textbooks neither the solvent surroundings nor the excitation wavelength strongly alter the reaction scheme. The experimental study demonstrates that the ring-closure reaction of photochromic indolylfulgides can be considered as a very robust photoprocess: this fact may lead to a great variety of different applications where the reaction dynamics of the molecular switch are not disturbed by any surrounding effects.