Imidazolium Based Ionic Liquids: Impact of the Cation Symmetry and Alkyl Chain Length on the Enthalpy of Vaporization

The vaporization thermodynamics of symmetric imidazolium based ionic liquids of the general formula [CnCnIm][Br] with the chains length n = 4, 5, 6, and 8 were investigated using a combination of DSC, TGA, and QCM methods with quantum chemical calculations. Comparison of vaporization enthalpies for the symmetric ([CnCnIm][Br]) and asymmetric imidazolium based ILs ([Cnmim][Br]) revealed a general trend with the lower vaporization enthalpies of the symmetric species indicating a significant decrease of the Coulombic interactions affecting energetics of vaporization.

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Yermalayeu, A., Zaitsau, D.H., Loor, M., Schaumann, J., Emel’yanenko, V.N., Schulz, S., Verevkin, S., 2020. Imidazolium Based Ionic Liquids: Impact of the Cation Symmetry and Alkyl Chain Length on the Enthalpy of Vaporization. https://doi.org/10.1002/zaac.201600332
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