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Title: Ion transport and structural dynamics in homologous ammonium and phosphonium-based room temperature ionic liquids

Abstract

Charge transport and structural dynamics in a homologous pair of ammonium and phosphonium based room temperature ionic liquids (ILs) have been characterized over a wide temperature range using broadband dielectric spectroscopy and quasi-elastic light scattering spectroscopy. We have found that the ionic conductivity of the phosphonium based IL is significantly enhanced relative to the ammonium homolog, and this increase is primarily a result of a lower glass transition temperature and higher ion mobility. Additionally, these ILs exhibit pronounced secondary relaxations which are strongly influenced by the atomic identity of the cation charge center. While the secondary relaxation in the phosphonium IL has the expected Arrhenius temperature dependence characteristic of local beta relaxations, the corresponding relaxation process in the ammonium IL was found to exhibit a mildly non-Arrhenius temperature dependence in the measured temperature range-indicative of molecular cooperativity. These differences in both local and long-range molecular dynamics are a direct reflection of the subtly different inter-ionic interactions and mesoscale structures found in these homologous ILs.

Authors:
 [1];  [2];  [3];  [2];  [4];  [5]
  1. Univ. of Pennsylvania, Philadelphia, PA (United States)
  2. Univ. of Tennessee, Knoxville, TN (United States)
  3. Wakayama College (Japan)
  4. Univ. of Leipzig (Germany)
  5. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1347312
DOE Contract Number:  
AC05-00OR22725
Resource Type:
Journal Article
Journal Name:
Journal of Chemical Physics
Additional Journal Information:
Journal Volume: 142; Journal Issue: 8; Journal ID: ISSN 0021-9606
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS

Citation Formats

Griffin, Phillip J., Holt, Adam P., Tsunashima, Katsuhiko, Sangoro, Joshua R., Kremer, Friedrich, and Sokolov, Alexei P. Ion transport and structural dynamics in homologous ammonium and phosphonium-based room temperature ionic liquids. United States: N. p., 2015. Web. doi:10.1063/1.4913239.
Griffin, Phillip J., Holt, Adam P., Tsunashima, Katsuhiko, Sangoro, Joshua R., Kremer, Friedrich, & Sokolov, Alexei P. Ion transport and structural dynamics in homologous ammonium and phosphonium-based room temperature ionic liquids. United States. doi:10.1063/1.4913239.
Griffin, Phillip J., Holt, Adam P., Tsunashima, Katsuhiko, Sangoro, Joshua R., Kremer, Friedrich, and Sokolov, Alexei P. Sun . "Ion transport and structural dynamics in homologous ammonium and phosphonium-based room temperature ionic liquids". United States. doi:10.1063/1.4913239. https://www.osti.gov/servlets/purl/1347312.
@article{osti_1347312,
title = {Ion transport and structural dynamics in homologous ammonium and phosphonium-based room temperature ionic liquids},
author = {Griffin, Phillip J. and Holt, Adam P. and Tsunashima, Katsuhiko and Sangoro, Joshua R. and Kremer, Friedrich and Sokolov, Alexei P.},
abstractNote = {Charge transport and structural dynamics in a homologous pair of ammonium and phosphonium based room temperature ionic liquids (ILs) have been characterized over a wide temperature range using broadband dielectric spectroscopy and quasi-elastic light scattering spectroscopy. We have found that the ionic conductivity of the phosphonium based IL is significantly enhanced relative to the ammonium homolog, and this increase is primarily a result of a lower glass transition temperature and higher ion mobility. Additionally, these ILs exhibit pronounced secondary relaxations which are strongly influenced by the atomic identity of the cation charge center. While the secondary relaxation in the phosphonium IL has the expected Arrhenius temperature dependence characteristic of local beta relaxations, the corresponding relaxation process in the ammonium IL was found to exhibit a mildly non-Arrhenius temperature dependence in the measured temperature range-indicative of molecular cooperativity. These differences in both local and long-range molecular dynamics are a direct reflection of the subtly different inter-ionic interactions and mesoscale structures found in these homologous ILs.},
doi = {10.1063/1.4913239},
journal = {Journal of Chemical Physics},
issn = {0021-9606},
number = 8,
volume = 142,
place = {United States},
year = {2015},
month = {2}
}

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