Stability of Supramolecular β-Cyclodextrin-Pyrene Complexes in A Silicate Hydrogel Matrix

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In order to use the β-cyclodextrin-pyrene complex as a fluorescent receptor center, its stability in the solid phase of a water-soluble silicate gel was investigated. For this purpose, a technique for obtaining a silicate matrix with a high content of supramolecular complexes was developed and the temperature stability of the resulting material was investigated. Optimal conditions for working with complexes in the silica gel matrix have been identified. Comparative studies of the fluorescence spectra of complexes in liquid and solid phases were carried out by the method of fluorescence spectroscopy. As a result of the work done, it was possible to determine the main patterns of behavior of the supramolecular complex in the silicate hydrogel matrix and to conclude about the influence of the matrix structure on its stability.

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作者简介

A. Kondakova

Center of Photochemistry of the Russian Academy of Sciences

编辑信件的主要联系方式.
Email: anv.kond@yandex.ru
俄罗斯联邦, Moscow, 119421

A. Medvedeva

Center of Photochemistry of the Russian Academy of Sciences

Email: anv.kond@yandex.ru
俄罗斯联邦, Moscow, 119421

A. Koshkin

Center of Photochemistry of the Russian Academy of Sciences

Email: anv.kond@yandex.ru
俄罗斯联邦, Moscow, 119421

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2. Fig. 1. The structure of the supramolecular complex Py–2β-CD [4].

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3. Fig. 2. Fluorescence spectra of the Py–2β-CD (1) complex and an aqueous solution of pyrene (2), normalized for the intensity of the second vibrational band.

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4. Fig. 3. Transmission of THEOS-based gels obtained at different pH values.

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5. Fig. 4. Fluorescence spectra of samples after the end of the gelation process, sustained at 0 ° C with a buffer at pH 9.18 (1) and without a buffer (2), normalized to the intensity of the second vibrational band.

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6. Fig. 5. Temperature dependence of the fluorescence of the Py–2β-CD complex in a gel, where 1 is the heating process, 2 is the cooling process.

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7. Fig. 6. Dependence of excimer fluorescence at a wavelength of 422 nm on temperature, where 1 is the heating process, 2 is the cooling process.

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