Probing the Reorganization of Ionic Liquids’ Structure Induced by CO2 Sorption

ChemPhysChem - Tập 21 Số 12 - Trang 1230-1234 - 2020
Luiz Fernando Lepre1, Margarida F Costa Gomes1, Rômulo A. Ando2
1Chemistry Laboratory ENS Lyon & CNRS 46 Allée d'Italie 69364 Lyon France
2Molecular Spectroscopy Laboratory Department of Fundamental Chemistry Institute of Chemistry University of São Paulo Av. Prof. Lineu Prestes, 748. Butantã 05508-000 São Paulo Brazil

Tóm tắt

AbstractThe sorption of CO2 is often used to modify the macroscopic properties of liquids and solids. In the particular case of ionic liquids, different from molecular liquids, the sorption of CO2 may not induce volume expansions due to the strong Coulombic interactions between the ions of the fluid. However, a considerable viscosity decrease has been systematically observed. In order to understand the mechanisms of properties modifications in ionic fluids, herein we used Raman spectroscopy to probe the effect of CO2 on the structure of ionic liquids. It is shown that CO2 perturbs the electrostatic interactions between cations and anions, thus inducing a change in the polar domain of ionic liquids. It is observed that ionic liquids having bulkier ions are more prone to be perturbed by CO2 in comparison to ionic liquids having smaller ions. These results reveal new means of controlling the electrostatic forces between the ions and contributes to the mechanistic understanding of the modification of the macroscopic properties of ionic liquids by CO2 sorption.

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ChemPhysChem

Tập 21 Số 12

1230-1234

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