The peculiar nature of molecular interactions between an imidazolium ionic liquid and acetone

Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry
Johannes KieferKristina Noack

Abstract

We present novel insights into the molecular interactions between polar solvents and imidazolium ionic liquids using the example of 1-ethyl-3-methylimidazolium ethyl sulfate and acetone. Recently published volumetric property data of this particular system have revealed peculiarities which could not be fully explained by steric effects. In order to shed light on the behavior at a molecular level, we apply IR spectroscopy and analyze solvent-induced line shifts as well as the excess IR spectra. From the spectroscopic results a conclusive picture of the site-specific molecular interactions is developed and our explanation is in concert with the volumetric effects. The data suggest the initial formation of trimers in which acetone interacts with existing ion pairs through interactions of the acetone oxygen atom with the imidazolium ring rather than forming directed hydrogen bonds at the CH moieties. With further addition of acetone, tetramers are formed which significantly weaken the interionic interactions and eventually initiate ion pair dissociation. Once the ions are released, the anion is rapidly saturated with acetone while the cation solvation proceeds more slowly with acetone addition.

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Citations

Sep 26, 2013·Physical Chemistry Chemical Physics : PCCP·Yan-Zhen ZhengZhi-Wu Yu
Jul 22, 2015·Physical Chemistry Chemical Physics : PCCP·Samrat DuttaSean Garrett-Roe
Jun 30, 2015·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Yan-Zhen ZhengZhi-Wu Yu
Jan 5, 2017·Chemical Reviews·Vitor H PaschoalMauro C C Ribeiro
Sep 22, 2016·Applied Spectroscopy·Johannes KieferEric von Lieres
Apr 19, 2018·Applied Spectroscopy·Johannes KieferKurosch Rezwan
Feb 3, 2018·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Jing XuZhi-Wu Yu
Sep 13, 2019·Physical Chemistry Chemical Physics : PCCP·Kaushik KunduJohannes Kiefer
Apr 2, 2020·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Payam KalhorZhi-Wu Yu
May 1, 2021·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Payam KalhorZhiwu Yu

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