The Effect of Lengthening Cation Ether Tails on Ionic Liquid Properties
In order to explore the effect of multiple ether functionalities on ionic liquid properties, a series of ten pyrrolidinium ionic liquids and ten imidazolium ionic liquids bearing ether and alkyl side chains of varying lengths (4 to 10 atoms in length) were prepared. Their physical properties, such a...
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Published in | ECS transactions Vol. 75; no. 15; pp. 215 - 232 |
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Main Authors | , , , , , , |
Format | Journal Article |
Language | English |
Published |
United States
The Electrochemical Society, Inc
30.08.2016
Electrochemical Society |
Subjects | |
Online Access | Get full text |
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Summary: | In order to explore the effect of multiple ether functionalities on ionic liquid properties, a series of ten pyrrolidinium ionic liquids and ten imidazolium ionic liquids bearing ether and alkyl side chains of varying lengths (4 to 10 atoms in length) were prepared. Their physical properties, such as viscosity, conductivity and thermal profile were measured and compared. Consistent with earlier literature, a single ether substituent substantially decreases the viscosity of pyrrolidinium and imidazolium ILs compared to their alkyl congeners. Remarkably, as the number of ether units in the pyrrolidinium ILs increases there is hardly any increase in the viscosity, in contrast to alkylpyrrolidinium ILs where the viscosity increases steadily with chain length. Viscosities of imidazolium ether ILs increase with chain length but always remain well below their alkyl congeners. These results provide significant insight on the choice of starting materials for researchers designing ILs for specific applications. |
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Bibliography: | BNL-114825-2017-JAAM USDOE Office of Science (SC), Workforce Development for Teachers and Scientists (WDTS) (SC-27) National Institutes of Health (NIH) SC0012704; CHE-1362272; AC02-98CH10886 City Univ. of New York, New York City, NY (United States) National Science Foundation (NSF) USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Chemical Sciences, Geosciences & Biosciences Division |
ISSN: | 1938-5862 1938-6737 1938-6737 |
DOI: | 10.1149/07515.0215ecst |