Exploring new solid-state photochromism of spiropyranes

• Project/Area Number: 24550041
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Organic chemistry
• Research Institution: The University of Tokyo
• Principal Investigator: OGAWA Keiichiro 東京大学, 総合文化研究科, 教授 (50114426)
• Co-Investigator(Kenkyū-buntansha): HARADA Jun 北海道大学, 理学(系)研究科(研究院), 准教授 (00313172)
• Project Period (FY): 2012-04-01 – 2016-03-31
• Project Status: Completed (Fiscal Year 2015)
• Budget Amount: ¥5,460,000 (Direct Cost: ¥4,200,000、Indirect Cost: ¥1,260,000); Fiscal Year 2014: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000); Fiscal Year 2013: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000); Fiscal Year 2012: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
• Keywords: フォトクロミズム / スピロピラン / スピロオキサジン / クロメン / 固相光反応 / 光異性化 / 光異性化反応 / 拡散反射スペクトル

Outline of Final Research Achievements

Spiropyrans and spirooxazines have long been believed to photochromic only in solutions and in polymers, and non-photochromic in the solid state. We have shown that chromenes as well as spiropyrans and spirooxazines are generally photochromic even in the solid state and that their photoreactivity increases greatly as the temperature is lowered. In the solid-state photochromism of chromenes, in addition to stable planar merocyanine forms, unstable colored species, which are tentatively assigned to the non-planar cisoid-cisoid form, were observed.

Research Products

• [Journal Article] What molecules are likely or unlikely to undergo pedal motions in crystals (2014)
  • Author(s): Harada, J., Ogawa, K.
  • Journal Title: Cryst. Growth Des. Volume: 14 Issue: 10 Pages: 1516-1519
  • DOI: 10.1021/cg500962y
  • Peer Reviewed
• [Journal Article] A trickey water molecule coordinated to a verdazyl radical-iron(II)complex : a multitechnique approach (2014)
  • Author(s): Hajime Kamebuchi, Masashi Okubo, Atsushi Okazawa, Masaya Enomoto, Jun Harada, Keiichiro Ogawa, Goro Maruta, Sadamu Takeda, Norimichi Kojima, Cyrille Train, Michel Verdaguer
  • Journal Title: Physical Chemistry Chemical Physics Volume: (印刷中) Issue: 19 Pages: 9086-9095
  • DOI: 10.1039/c4cp00310a
  • Peer Reviewed
• [Presentation] Syntheses and magnetic properties of transition-metal complexes with multichelating and high-spin radical ligands (2015)
  • Author(s): Atsushi Okazawa, Takayuki Ishida, Norimichi Kojima, Keiichiro Ogawa
  • Organizer: The International Chemical Congress of Pacific Basin Societies 2015
  • Place of Presentation: Honolulu, USA
  • Year and Date: 2015-12-15
• [Presentation] 有機結晶に何を見るか (2014)
  • Author(s): 小川桂一郎
  • Organizer: 日本結晶学会平成26年度年会
  • Place of Presentation: 東京大学農学部（東京都文京区）
  • Year and Date: 2014-11-01 – 2014-11-03
  • Invited
• [Presentation] スチルベン類固体試料の光反応 (2014)
  • Author(s): 羽賀悠史、小川桂一郎
  • Organizer: 第23回有機結晶部会シンポジウム
  • Place of Presentation: 東邦大学習志野キャンパス（千葉県習志野市）
  • Year and Date: 2014-09-15 – 2014-09-17
• [Presentation] 2-ヒドロキシピリジン類の固体状態におけるプロトン互変異性 (2014)
  • Author(s): 福田隆敏、小川桂一郎
  • Organizer: 第23回有機結晶部会シンポジウム
  • Place of Presentation: 東邦大学習志野キャンパス(千葉県習志野市）
  • Year and Date: 2014-09-15 – 2014-09-17
• [Presentation] アゾベンゼン類の固相光反応 (2013)
  • Author(s): 内田彩乃，豊田太郎，原田潤，小川桂一郎
  • Organizer: 2013年光化学討論会
  • Place of Presentation: 愛媛大学(愛媛県松山市)
• [Presentation] Solid-State Photochromism of Chromenes (2012)
  • Author(s): K.Ogawa, K.Ueki, J.Harada
  • Organizer: The 27th European Crystallographic Meeting
  • Place of Presentation: Bergen, Norway
• [Remarks] 小川研究室
  • URL: http://ogawa.c.u-tokyo.ac.jp/list.html
• [Remarks] 小川研究室 東京大学大学院総合文化研究科 相関基礎科学系
  • URL: http://ogawa.c.u-tokyo.ac.jp/
• [Remarks] 小川研究室 東京大学大学院総合文化研究科広域科学専攻相関基礎科学系
  • URL: http://maildbs.c.u-tokyo.ac.jp/~ogawa/