The effect of structural modifications on the thermal stability, melting points and ion interactions for a series of tetraaryl-phosphonium-based mesothermal ionic liquids

A family of mesothermal ionic liquids comprised of tetraarylphosphonium cations and the bis(trifluoromethanesulfonyl)amidate anion are shown to be materials of exceptional thermal stability, enduring (without decomposition) heating in air at 300 °C for three months. It is further established that th...

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Bibliographic Details
Published in:Physical chemistry chemical physics : PCCP 2017, Vol.19 (47), p.31560-31571
Main Authors: Cassity, Cody A, Siu, Benjamin, Soltani, Mohammad, McGeehee, Jimmy L, Strickland, Katie J, Vo, Matt, Salter, E Alan, Stenson, Alexandra C, Wierzbicki, Andrzej, West, Kevin N, Rabideau, Brooks D, Davis, James H
Format: Article
Language:English
Subjects:
Cations
Ionic liquids
Ions
Melting points
Solvents
Structural members
Thermal stability
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Summary:A family of mesothermal ionic liquids comprised of tetraarylphosphonium cations and the bis(trifluoromethanesulfonyl)amidate anion are shown to be materials of exceptional thermal stability, enduring (without decomposition) heating in air at 300 °C for three months. It is further established that three specific structural elements - phenoxy, phenacyl, and phenyl sulfonyl - can be present in the cation structures without compromising their thermal stability, and that their incorporation has specific impacts on the melting points of the salts. Most importantly, it is shown that the ability of such a structural component to lower a salt melting point is tied to its ability to lower cation-cation repulsions in the material.
ISSN:1463-9076
1463-9084
DOI:10.1039/c7cp06278h