Spectral properties of tolan and its supramolecular complexes in solution and silicate hydrogel

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Resumo

The complexation process of tolane and α-cyclodextrin in water, aqueous-ethanol solution and silicate hydrogel based on tetrakis(2 hydroxyethyl)orthosilicate was studied. The complex formation in solutions were confirmed by electron and 1H NMR spectroscopy, and the stability constant of the complex was determined using spectrofluorimetric titration (lgK1:1 = 1.5). The preservation of the inclusion complex during the preparation of the gel was confirmed by electron spectroscopy.

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Sobre autores

G. Novitskii

Photochemistry Center of the Russian Academy of Sciences, Federal Research Center “Crystallography and Photonics” – National Research Center “Kurchatov Institute”

Autor responsável pela correspondência
Email: georg.nov97@gmail.com
Rússia, Moscow, 119421

A. Medvedeva

Photochemistry Center of the Russian Academy of Sciences, Federal Research Center “Crystallography and Photonics” – National Research Center “Kurchatov Institute”

Email: georg.nov97@gmail.com
Rússia, Moscow, 119421

A. Koshkin

Photochemistry Center of the Russian Academy of Sciences, Federal Research Center “Crystallography and Photonics” – National Research Center “Kurchatov Institute”

Email: georg.nov97@gmail.com
Rússia, Moscow, 119421

A. Vedernikov

Photochemistry Center of the Russian Academy of Sciences, Federal Research Center “Crystallography and Photonics” – National Research Center “Kurchatov Institute”

Email: georg.nov97@gmail.com
Rússia, Moscow, 119421

N. Lobova

Photochemistry Center of the Russian Academy of Sciences, Federal Research Center “Crystallography and Photonics” – National Research Center “Kurchatov Institute”; Moscow Institute of Physics and Technology

Email: georg.nov97@gmail.com
Rússia, Moscow, 119421; Dolgoprudny, 141701

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2. Fig. 1. Hydrolysis of THEOS.

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3. Fig. 2. Polycondensation reaction.

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4. Fig. 3. Formation of a three-dimensional gel matrix.

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5. 4. 1H NMR spectrum of THEOS.

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6. 5. Structural formulas of tolan (a) and α-cyclodextrin (b) molecules.

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7. 6. The PMR spectrum of the tolan–α-cyclodextrin mixture in D2O, with an increase in significant peaks in the aromatic region of the spectrum.

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8. 7. Changes in the absorption (a) and fluorescence (b, lex = 295 nm) spectra during titration of tolane with a-cyclodextrin solution.

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9. 8. Fluorescence spectra of lex = 295 nm tolane and its complexes in solution and gel.

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10. Fig. 9. Baseline for the absorption spectrum (a) of the hydrogel obtained by the improved method and the transmission values (b) of the hydrogels obtained at different pH.

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11. 10. Fluorescence spectra lex = 295 nm of tolan and its complexes in solution and gel, normalized to the values of maxima.

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