Dynamics and Mechanisms of the Multiphoton Gated Photochromic Reaction of Diarylethene Derivatives

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• 作者：Masataka Murakami ; Hiroshi Miyasaka ; Tadashi Okada ; Seiya Kobatake ; and Masahiro Irie
• 刊名：Journal of the American Chemical Society
• 出版年：2004
• 出版时间：November 17, 2004
• 年：2004
• 卷：126
• 期：45
• 页码：14764 - 14772
• 全文大小：257K
• 年卷期：v.126,no.45(November 17, 2004)
• ISSN：1520-5126

文摘

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 andfemtosecond laser photolysis methods. The drastic enhancement of the reaction yield was observed onlyby the picosecond laser exposure. The excitation intensity effect of the reaction profiles revealed that thesuccessive 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 toa higher excited state did not lead to the efficient cycloreversion reaction. These results indicate that notthe energy of the excitation but the character of the electronic state takes an important role in theenhancement of the cycloreversion reaction.