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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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Date Issued:
08.12.2020
URN:
urn:nbn:de:hbz:464-20201208-102622-0
DOI:
10.1002/zaac.201600332
Language:
English
Type of Resource:
Text
Keywords:
Ionic liquids; enthalpy of vaporization; thermogravimetry; quartz-crystal microbalance; quantum chemical calculations
Collection:
E-Publications
Subject categories of the Deutsche Nationalbibliografie:
540 Chemistry & allied sciences
Hosting institution:
Faculty of Chemistry, Anorganische Chemie
Hosting institution:
Scientific institutes, Center for Nanointegration Duisburg-Essen (CENIDE)
Info on primary publication:

This is the peer reviewed version of the following article: Z. Anorg. Allg . Chem. 2017, 643,1 Special Issue: Reactions in Ionic Liquids, 81-86, which has been published in final form at:
https://doi.org/10.1002/zaac.201600332

Version of Record online: 08 November 2016

restriction:
This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions.
version identification:
Authors Accepted Manuscript.

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