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Photoprotolytic Reactions in Systems Immobilized on Silica Gel Using a Cationic Polyelectrolyte

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Moscow University Chemistry Bulletin Aims and scope

Abstract

The patterns of protolytic reactions in the immobilized state are studied using the example of classical systems with photoinduced proton transfer (2-naphthol and its sulfonated derivatives). It is found that the fixation of indicators with a cationic polyelectrolyte leads to a shift of pKa to the acidic region, and the magnitude of the shift depends on the number of sulfo groups in the molecule and reaches 1.2 units for disodium 2-naphthol-3,6,8-trisulfonate. At the same time, the photoprotolytic reaction in the lower singlet-excited state proceeds in the same way as for an unimmobilized substance, and no significant shift of \({\text{p}}K_{a}^{*}\) is observed. The possibility of creating a flow-through acidity sensor using a change in the ratio of the band intensities of the indicator protonated and deprotonated forms as an analytical signal is demonstrated.

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ACKNOWLEDGMENTS

The study was carried out using the equipment of the Center for Joint Use of MIREA—Russian Technological University.

Funding

The study was carried out within the framework of the state assignment of the Russian Federation (in accordance with theme no. 0706-2020-0020).

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Authors and Affiliations

  1. Lomonosov Institute of Fine Chemical Technologies, MIREA–Russian Technological University, 119571, Moscow, Russia

    A. O. Naumova, A. S. Mugabutaeva, P. V. Melnikov & N. K. Zaitsev

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  1. A. O. Naumova
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  2. A. S. Mugabutaeva
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  3. P. V. Melnikov
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  4. N. K. Zaitsev
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Correspondence to A. O. Naumova.

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Translated by G. Levit

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Naumova, A.O., Mugabutaeva, A.S., Melnikov, P.V. et al. Photoprotolytic Reactions in Systems Immobilized on Silica Gel Using a Cationic Polyelectrolyte. Moscow Univ. Chem. Bull. 76, 14–20 (2021). https://doi.org/10.3103/S0027131421010090

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  • DOI: https://doi.org/10.3103/S0027131421010090

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