Thermodynamics of complexation of cesium with dibenzo-21-crown-7 and dibenzo-24-crown-8 in 1-butyl-3-methylimidazolium bis((trifluoromethyl)sulfonyl)imide
| Autor: | V. I. Privalov, V. I. Chistov, A. G. Vendilo |
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| Rok vydání: | 2012 |
| Předmět: |
Sulfonyl
chemistry.chemical_classification Trifluoromethyl Materials Science (miscellaneous) Inorganic chemistry chemistry.chemical_element Nuclear magnetic resonance spectroscopy Medicinal chemistry Inorganic Chemistry chemistry.chemical_compound chemistry Caesium Ionic liquid Physical and Theoretical Chemistry Imide 1-butyl-3-methylimidazolium |
| Zdroj: | Russian Journal of Inorganic Chemistry. 57:629-633 |
| ISSN: | 1531-8613 0036-0236 |
| DOI: | 10.1134/s0036023612040262 |
| Popis: | The stability constants of the cesium complexes [Cs(DB21C7)]+ and [Cs(DB24C8)]+, where DB21C7 = dibenzo-21-crown-7 and DB24C8 = dibenzo-24-crown-8, in the hydrophobic ionic liquid 1-butyl-3-methylimidazolium bis((trifluoromethyl)sulfonyl)imide ([BMIM][N(Tf)2]) have been measured by 133Cs NMR spectroscopy between 24 and 54°C. The enthalpies and entropies of complexation have been determined. For [Cs(DB21C7)]+ and [Cs(DB24C8)]+ at 25°C, log K1 = 3.52 (0.01) and 2.91 (0.04), ΔH1 = −27 (1) and −7 (6) /mol, and ΔS1 = −23 (3) and 33 (20) J/(mol K), respectively. |
| Databáze: | OpenAIRE |
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