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The photochromism of nitrospiropyran included in γ-cyclodextrin

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Summary

The inclusion compounds of 1′, 3′, 3′-trimethyl-6-nitrospiro-[2H, 1-benzo-pyran-2, 2′-indoline] (NSP) with γ-cyclodextrin (γ-CD), 2,3,6,0-permethylated γ-CD (γ-MCD), and naphthyl modified γ-CD (γ-NCD) showed normal photochromism in the solid state with high light sensitivity comparable with that of NSP dispersed in polymer matrices. This is in sharp contrast with NSP in the crystalline state, which is much less photosensitive. These results suggest that the host cavity offers a sufficient free volume for phototransformation of the guest molecule. The colored form of the inclusion compounds were found to be more stable both chemically upon prolonged UV irradiation and thermally in the dark as compared with that in a PMMA film.

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Authors and Affiliations

  1. Research Institute for Polymers and Textiles, 1-1-4 Higashi, 305, Tsukuba, Japan

    Takashi Tamaki, Masako Sakuragi & Kunihiro Ichimura

  2. Toda Kogyo Corp., Funairi-Minami, Naka-ku, 730, Hiroshima, Japan

    Koso Aoki

  3. Science and Engineering Department, Tokyo Science University, Yamasaki, 278, Noda, Chiba, Japan

    Ikuko Arima

Authors
  1. Takashi Tamaki
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  2. Masako Sakuragi
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  3. Kunihiro Ichimura
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  4. Koso Aoki
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  5. Ikuko Arima
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Tamaki, T., Sakuragi, M., Ichimura, K. et al. The photochromism of nitrospiropyran included in γ-cyclodextrin. Polymer Bulletin 24, 559–564 (1990). https://doi.org/10.1007/BF00395580

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  • DOI: https://doi.org/10.1007/BF00395580

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