Syntheses and properties of imidazopyridine-based ionic liquids
| Autor: | Satoshi Kitaoka, Yuta Kitagawa, Ryo Nozoe, Kaoru Nobuoka |
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| Jazyk: | angličtina |
| Rok vydání: | 2024 |
| Předmět: | |
| Zdroj: | Journal of Ionic Liquids, Vol 4, Iss 2, Pp 100100- (2024) |
| Druh dokumentu: | article |
| ISSN: | 2772-4220 27044017 |
| DOI: | 10.1016/j.jil.2024.100100 |
| Popis: | We have synthesized imidazopyridine-type ionic liquids and evaluated their properties. [Cnimpy][Br] (n = 4, 6, 8, 10), in which an alkyl group was introduced at the N1 position of imidazo[1,2-a]pyridine, were all solid at room temperature. Exchange of the counteranions of [Cnimpy][Br] with N(CN)2− and FSI− gave the ionic liquids [Cnimpy][N(CN)2] and [Cnimpy][FSI] in the liquid state at room temperature. In particular, the DSC thermogram of [C10impy][FSI] showed a clear melting point at 22 °C. In [Cnimpy][TFSI], ionic liquids consisting of cations with short alkyl chain lengths (n = 4,6) were solids at room temperature, while those with long alkyl chain lengths (n = 8,10) were liquids. [Cnimpy][FSI] has lower viscosity than other anion-consisting ionic liquids which showed a liquid state at room temperature. [Cnimpy][FSI] has lower viscosity than other anion-containing ionic liquids. In particular, [C4impy][FSI], with its relatively short alkyl chain length, exhibited a viscosity of 101 mPa·s at 25 °C, which renders it suitable for practical applications. [C4impy] [FSI] (50 μM acetonitrile solution) showed fluorescence with maximum absorption at 336 nm. Its fluorescence wavelength was shorter than that of imidazo[1,2-a]pyridine, whereas its fluorescence quantum yield (ΦF 0.39) was higher. Therefore, it is expected to be used as a composite material by employing FRET with a substance that exhibits fluorescence in the visible region. |
| Databáze: | Directory of Open Access Journals |
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