Alkylimidazolium Protic Ionic Liquids: Structural Features and Physicochemical Properties.

Autor: Shmukler LE; G.A. Krestov Institute of Solution Chemistry, Russian Academy of Sciences, 1 Akademicheskaya St., Ivanovo, 153045, Russia., Fedorova IV; G.A. Krestov Institute of Solution Chemistry, Russian Academy of Sciences, 1 Akademicheskaya St., Ivanovo, 153045, Russia., Fadeeva YA; G.A. Krestov Institute of Solution Chemistry, Russian Academy of Sciences, 1 Akademicheskaya St., Ivanovo, 153045, Russia., Gruzdev MS; G.A. Krestov Institute of Solution Chemistry, Russian Academy of Sciences, 1 Akademicheskaya St., Ivanovo, 153045, Russia., Safonova LP; G.A. Krestov Institute of Solution Chemistry, Russian Academy of Sciences, 1 Akademicheskaya St., Ivanovo, 153045, Russia.
Jazyk: angličtina
Zdroj: Chemphyschem : a European journal of chemical physics and physical chemistry [Chemphyschem] 2022 Feb 16; Vol. 23 (4), pp. e202100772. Date of Electronic Publication: 2022 Jan 18.
DOI: 10.1002/cphc.202100772
Abstrakt: We focus on a series of protic ionic liquids (PILs) with imidazolium and alkylimidazolium (1R3HIm, R=methyl, ethyl, propyl, and butyl) cations. Using the literature data and our experimental results on the thermal and transport properties, we analyze the effects of the anion nature and the alkyl radical length in the cation structure on the above properties. DFT calculations in gas and solvent phase provide further microscopic insights into the structure and cation-anion binding in these PILs. We show that the higher thermodynamic stability of an ion pair raises the PIL decomposition temperature. The melting points of the salts with the same cation decrease as the hydrocarbon radical in the cation becomes longer, which correlates with the weaker ion-ion interaction inthe ion pairs. A comparative analysis of the protic ILs and corresponding ILs (1R3MeIm) with the same radical (R) in the cation structure and the same anion has been performed. The lower melting points of the ILs with 1R3MeIm cations are assumed to result from the weakening of both the ion-ion interaction and the hydrogen bond.
(© 2021 Wiley-VCH GmbH.)
Databáze: MEDLINE
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