Dynamics and mechanisms of the multiphoton gated photochromic reaction of diarylethene derivatives
Dynamics and mechanisms of the multiphoton gated photochromic reaction of diarylethene derivatives
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DOI：
10.1021/ja049177
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发表时间：
2004-11-17
影响因子：
15
通讯作者：
Irie, M
中科院分区：
文献类型：
--
作者：
Murakami, M;Miyasaka, H;Irie, M
利用皮秒和飞秒激光光解方法研究了光致变色二芳基乙烯衍生物双（2-甲基-5-苯基噻吩-3-基）全氟环戊烯的环反转（开环）过程。反应产率的急剧提高，观察到只有皮秒激光曝光。反应曲线的激发强度效应表明，连续的多光子吸收过程导致更高的激发态，开启了有效的环化反转过程，反应产率为（50 ± 10）%，而单光子吸收直接泵浦到更高的激发态并不导致有效的环化反转反应。这些结果表明，不是激发能而是电子态的性质对环化反转反应的增强起重要作用。
The cycloreversion (ring-opening) process of one of the photochromic diarylethene derivatives, bis(2-methyl-5-phenylthiophen-3-yl)perfluorocyclopentene, was investigated by means of picosecond and femtosecond laser photolysis methods. The drastic enhancement of the reaction yield was observed only by the picosecond laser exposure. The excitation intensity effect of the reaction profiles revealed that the successive multiphoton absorption process leading to higher excited states opened the efficient cycloreversion process with a reaction yield of (50 +/- 10)%, while the one-photon absorption directly pumped to a higher excited state did not lead to the efficient cycloreversion reaction. These results indicate that not the energy of the excitation but the character of the electronic state takes an important role in the enhancement of the cycloreversion reaction.