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Photochromic hybrid sol–gel films containing naphthopyrans

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Abstract

Several photochromic benzo- and naphthopyrans were embedded in hybrid organic–inorganic ureasilicate based films obtained by a sol–gel process. The resulting films, containing 0.1% (w/w) of the photochromic compound, were transparent and flexible and for naphthopyrans they were colourless or presented just a slight colouration. Under UV continuous irradiation the films developed a significant absorption in the visible region that fades in the dark with variable kinetics depending on the naphthopyran structure. 2,2-Diphenyl-3H-naphtho[2,1-b]pyran films showed a very fast colouration under UV light giving rise to coloured open forms, containing mainly the TC isomer (98%) along with a very small amount of the more stable TT isomer (2%), that practically returned to the initial absorbance in 1 min.

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Authors and Affiliations

  1. Centro de Química, Vila Real, Universidade de Trás-os-Montes e Alto Douro, 5001-801, Vila Real, Portugal

    Paulo J. Coelho & Luís M. Carvalho

  2. Centro de Química, Universidade do Minho, Campus de Gualtar, 4710-057, Braga, Portugal

    Luis F. F. F. Gonçalves, Carlos J. R. Silva & Ana M. Campos

  3. Centro de Física, Universidade do Minho, Campus de Gualtar, 4710-057, Braga, Portugal

    M. Jesus Gomes

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  1. Paulo J. Coelho
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  2. Luís M. Carvalho
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  3. Luis F. F. F. Gonçalves
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  4. Carlos J. R. Silva
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  5. Ana M. Campos
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  6. M. Jesus Gomes
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Correspondence to Paulo J. Coelho.

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Coelho, P.J., Carvalho, L.M., Gonçalves, L.F.F.F. et al. Photochromic hybrid sol–gel films containing naphthopyrans. J Sol-Gel Sci Technol 56, 203–211 (2010). https://doi.org/10.1007/s10971-010-2295-5

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  • DOI: https://doi.org/10.1007/s10971-010-2295-5

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