Features of Complexation of a Styryl Dye Dimethylamino Derivative with Cucurbit[7]uril.
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| Title: | Features of Complexation of a Styryl Dye Dimethylamino Derivative with Cucurbit[7]uril. |
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| Authors: | Ivanov, D. A.1 (AUTHOR) ivanovd@photonics.ru, Kolesnikova, O. P.2 (AUTHOR), Kryukov, I. V.1 (AUTHOR), Petrov, N. Kh.1,2 (AUTHOR) |
| Source: | High Energy Chemistry. Jun2025, Vol. 59 Issue 3, p222-226. 5p. |
| Subjects: | Electrostatic fields, Inclusion compounds, Absorption spectra, Double bonds, Excited states, Cucurbituril |
| Abstract: | The features of complexation of the styryl dye 4-{(E)-2-[4-(dimethylamino)phenyl]vinyl}-1-methylpyridinium iodide (DASPI) in an aqueous solution of cucurbit[7]uril (CB7) have been studied using steady-state and time-resolved fluorescence spectroscopy. It has been found that the formation of 1 : 2 inclusion complexes causes significant changes in the absorption spectra and stimulates emission from a higher excited electronic state in the 400 nm band. Using fluorescence titration in this band, the binding constants have been determined as log K1 = 5.5 and log K2 = 5.1 for the 1 : 1 and 1 : 2 DASPI–CB7 inclusion complexes, respectively. These changes can be attributed to the influence of the electrostatic field of the CB7 portals on the conjugated system of DASPI double bonds. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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| Abstract: | The features of complexation of the styryl dye 4-{(E)-2-[4-(dimethylamino)phenyl]vinyl}-1-methylpyridinium iodide (DASPI) in an aqueous solution of cucurbit[7]uril (CB7) have been studied using steady-state and time-resolved fluorescence spectroscopy. It has been found that the formation of 1 : 2 inclusion complexes causes significant changes in the absorption spectra and stimulates emission from a higher excited electronic state in the 400 nm band. Using fluorescence titration in this band, the binding constants have been determined as log K1 = 5.5 and log K2 = 5.1 for the 1 : 1 and 1 : 2 DASPI–CB7 inclusion complexes, respectively. These changes can be attributed to the influence of the electrostatic field of the CB7 portals on the conjugated system of DASPI double bonds. [ABSTRACT FROM AUTHOR] |
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| ISSN: | 00181439 |
| DOI: | 10.1134/S0018143925700031 |
