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Proton donor–acceptor property of matrix during the sol–gel reaction

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Abstract

The UV–VIS absorption spectrum of thymol blue (TB), which was used for an in situ probe for the proton donor–acceptor property of the surrounding matrix, has been observed as a function of time during the sol–gel–xerogel reactions of tetraethyl orthosilicate under HCl catalyzed and uncatalyzed conditions. The value of relative abundance, RA Z , of zwitter ion species was calculated. In the ethanol-containing system, RA Z increased for 7 h, then decreased until 114 h had passed, and finally increased gradually. These dynamic changes of the RA Z were commonly observed for all the systems. The final RA Z values were expected larger than 0.7 irrespective of the initial chemical composition. The characteristic increase and decrease in RA Z are ascribed to the increase and decrease in proton-donating ability from the surrounding matrix to encapsulated TB molecules. A general acidity function, H −, of the matrix was estimated.

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Acknowledgment

This research was supported in part by the Grand-in-Aid on Priority-Area-Research Photoreaction Dynamics from the Ministry of Education, Science, Sports, and Culture of Japan (No. 07228102).

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Authors and Affiliations

  1. Department of Environmental Science and Technology, Faculty of Engineering, Shinshu University, Wakasato, Nagano, 380-8553, Nagano, Japan

    Hiromasa Nishikiori, Nobuaki Tanaka & Tsuneo Fujii

  2. Department of Chemistry and Materials Engineering, Faculty of Engineering, Shinshu University, Wakasato, Nagano, 380-8553, Nagano, Japan

    Yukio Isowaki, Yoshihisa Tanno, Takeshi Nomoto, Kazuhiro Toriumi, Shozi Mishima & Tsuneo Fujii

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  1. Hiromasa Nishikiori
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  2. Nobuaki Tanaka
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  3. Yukio Isowaki
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  4. Yoshihisa Tanno
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  5. Takeshi Nomoto
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  6. Kazuhiro Toriumi
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  7. Shozi Mishima
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  8. Tsuneo Fujii
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Correspondence to Tsuneo Fujii.

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Nishikiori, H., Tanaka, N., Isowaki, Y. et al. Proton donor–acceptor property of matrix during the sol–gel reaction. Res Chem Intermed 35, 227–240 (2009). https://doi.org/10.1007/s11164-008-0014-4

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  • DOI: https://doi.org/10.1007/s11164-008-0014-4

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