Photochemical and photophysical behavior of p-methoxyphenylalkenyl phenanthrenecarboxylates. II. Kinetic investigation of intramolecular cycloaddition.
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概要
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The efficiency of [2+2] photocycloadduct formation was examined by measuring fluorescence lifetimes and the quantum yields of fluorescence and product formation in two series of <I>p</I>-methoxyphenylalkenyl 9-phenanthrenecarboxylates (A-<I>n</I>E and B-<I>n</I>E). In (<I>E</I>)-3-(<I>p</I>-methoxyphenyl)-3-pentenyl, (<I>E</I>)-4-(<I>p</I>-methoxyphenyl)-4-hexenyl, and (<I>E</I>)-5-(<I>p</I>-methoxyphenyl)-5-heptenyl 9-phenanthrenecarboxylates (B-2E, B-3E, and B-4E, respectively) the intramolecular quenching leads to product (cyclobutane+oxetane) formation in almost unit efficiency, while in (<I>E</I>)-4-(<I>p</I>-methoxyphenyl)-3-butenyl and (<I>E</I>)-5-(<I>p</I>-methoxyphenyl)-4-pentenyl 9-phenanthrenecarboxylates (A-2E and A-3E, respectively) exciplex→product efficiency is a half to three quarters. Intermediacy of plural exciplex intermediates is suggested in the present bichromophoric systems on the basis of exciplex quenching results.
- 公益社団法人 日本化学会の論文
著者
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Itoh Hiroki
Department Of Cardiology Tokyo Women's Medical University
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Sakuragi Hirochika
Department Of Chemistry University Of Tsukuba
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Tokumaru Katsumi
Department of Chemistry Faculty of Science The University of Tokyo
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Kikuchi Katsuo
Department of Chemistry Faculty of Science Tohoku University
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Caldwell R.
Department of Chemistry, The University of Texas at Dallas
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Terakawa Kohki
Department of Chemistry, Faculty of Science, Yamagata University
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Hsu Chien-Chung
Department of Chemistry, The University of Texas at Dallas
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