イワクラ イズミ   Iwakura Izumi
  岩倉 いずみ
   所属   神奈川大学  工学部 化学教室
    神奈川大学大学院  工学研究科 工学専攻(応用化学領域)
   職種   教授
言語種別 英語
発行・発表の年月 2009/11
形態種別 学術雑誌
査読 査読あり
標題 Why is Indigo Photostable over Extremely Long Periods?
執筆形態 共著
掲載誌名 Chemistry Letters
掲載区分国外
出版社・発行元 The Chemical Society of Japan
巻・号・頁 38(11),pp.1020-1021
著者・共著者 Izumi Iwakura, Atsushi Yabushita, Takayoshi Kobayashi
概要 This experimental work clarifies the mechanism for the ultra-photostability of indigo carmine by direct observation of a transition state using a sub 5-fs laser pulse. The molecular structural changes during the photoexcited proton-transfer process were traced as the time-dependent instantaneous frequency of molecular vibrations. The mono-alcohol intermediate generated by proton transfer via stepwise path was found to be unstable, and it immediately reverted to indigo carmine. This regression to the reactant is the reason for the ultraphotostability of indigo over extremely long periods.