Ultrafast Photo-Dynamics of a Reversible Photochromic Spiropyran

DOI Web Site 被引用文献4件
  • Jonathan Hobley
    Department of Chemistry, Graduate School of Science, Tohoku University, Sendai 980-8578, Japan, Department of Chemistry, University of Mainz, 55099 Mainz, Federal Republic of Germany, and Department of Applied Physics, Osaka University, Suita, Osaka 565-0871, Japan
  • Ursula Pfeifer-Fukumura
    Department of Chemistry, Graduate School of Science, Tohoku University, Sendai 980-8578, Japan, Department of Chemistry, University of Mainz, 55099 Mainz, Federal Republic of Germany, and Department of Applied Physics, Osaka University, Suita, Osaka 565-0871, Japan
  • Michael Bletz
    Department of Chemistry, Graduate School of Science, Tohoku University, Sendai 980-8578, Japan, Department of Chemistry, University of Mainz, 55099 Mainz, Federal Republic of Germany, and Department of Applied Physics, Osaka University, Suita, Osaka 565-0871, Japan
  • Tsuyoshi Asahi
    Department of Chemistry, Graduate School of Science, Tohoku University, Sendai 980-8578, Japan, Department of Chemistry, University of Mainz, 55099 Mainz, Federal Republic of Germany, and Department of Applied Physics, Osaka University, Suita, Osaka 565-0871, Japan
  • Hiroshi Masuhara
    Department of Chemistry, Graduate School of Science, Tohoku University, Sendai 980-8578, Japan, Department of Chemistry, University of Mainz, 55099 Mainz, Federal Republic of Germany, and Department of Applied Physics, Osaka University, Suita, Osaka 565-0871, Japan
  • Hiroshi Fukumura
    Department of Chemistry, Graduate School of Science, Tohoku University, Sendai 980-8578, Japan, Department of Chemistry, University of Mainz, 55099 Mainz, Federal Republic of Germany, and Department of Applied Physics, Osaka University, Suita, Osaka 565-0871, Japan

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説明

We report the first ultrafast ring closure kinetics of the merocyanine (MC) of a reverse photochromic spiropyran 1‘,3‘,3‘-trimethyl-6,8-dinitrospiro[2H-1-benzopyran-2,2-indoline] (6,8-dinitro BIPS) and its 1‘-(2-carboxyethyl) substituted derivative. The reaction is fast and essentially over in a few hundred picoseconds. The rate of MC-S1 state decay evaluated from transient absorbance can be correlated directly with the MC-S1 state lifetime as determined using stimulated and ordinary emission measurements. The recovery of the MC-S0 state from MC-S1 has a component with a lifetime of 60−78 ps in acetonitrile with a second component of 350−470 ps probably due to a metastable intermediate. We can further establish that the excited MC-S1 state takes on the order of 500 fs to form from higher-energy states after photoexcitation with 390 nm light.

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