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Title: Communication: Unusual structure and transport in ionic liquid-hexane mixtures

Abstract

Ionic liquids having a sufficiently amphiphilic cation can dissolve large volume fractions of alkanes, leading to mixtures with intriguing properties on molecular length scales. The trihexyl(tetradecyl)phosphonium cation paired with the bis(trifluoromethylsulfonyl)amide anion provides an ionic liquid that can dissolve large mole fractions of hexane. We present experimental results on mixtures of n-C{sub 6}D{sub 14} with this ionic liquid. High-energy X-ray scattering studies reveal a persistence of the characteristic features of ionic liquid structure even for 80% dilution with n-C{sub 6}D{sub 14}. Nuclear magnetic resonance self-diffusion results reveal decidedly non-hydrodynamic behavior where the self-diffusion of the neutral, non-polar n-C{sub 6}D{sub 14} is on average a factor of 21 times faster than for the cation. Exploitation of the unique structural and transport properties of these mixtures may lead to new opportunities for designer solvents for enhanced chemical reactivity and interface science.

Authors:
; ;  [1]
  1. Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, Piscataway, New Jersey 08854 (United States)
Publication Date:
OSTI Identifier:
22415547
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Chemical Physics; Journal Volume: 142; Journal Issue: 12; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; ANIONS; CATIONS; DILUTION; HEXANE; INTERFACES; LIQUIDS; MIXTURES; MOLTEN SALTS; NUCLEAR MAGNETIC RESONANCE; REACTIVITY; SELF-DIFFUSION; SOLVENTS; X-RAY DIFFRACTION

Citation Formats

Liang, Min, Khatun, Sufia, and Castner, Edward W., E-mail: ecastner@rci.rutgers.edu. Communication: Unusual structure and transport in ionic liquid-hexane mixtures. United States: N. p., 2015. Web. doi:10.1063/1.4916388.
Liang, Min, Khatun, Sufia, & Castner, Edward W., E-mail: ecastner@rci.rutgers.edu. Communication: Unusual structure and transport in ionic liquid-hexane mixtures. United States. doi:10.1063/1.4916388.
Liang, Min, Khatun, Sufia, and Castner, Edward W., E-mail: ecastner@rci.rutgers.edu. Sat . "Communication: Unusual structure and transport in ionic liquid-hexane mixtures". United States. doi:10.1063/1.4916388.
@article{osti_22415547,
title = {Communication: Unusual structure and transport in ionic liquid-hexane mixtures},
author = {Liang, Min and Khatun, Sufia and Castner, Edward W., E-mail: ecastner@rci.rutgers.edu},
abstractNote = {Ionic liquids having a sufficiently amphiphilic cation can dissolve large volume fractions of alkanes, leading to mixtures with intriguing properties on molecular length scales. The trihexyl(tetradecyl)phosphonium cation paired with the bis(trifluoromethylsulfonyl)amide anion provides an ionic liquid that can dissolve large mole fractions of hexane. We present experimental results on mixtures of n-C{sub 6}D{sub 14} with this ionic liquid. High-energy X-ray scattering studies reveal a persistence of the characteristic features of ionic liquid structure even for 80% dilution with n-C{sub 6}D{sub 14}. Nuclear magnetic resonance self-diffusion results reveal decidedly non-hydrodynamic behavior where the self-diffusion of the neutral, non-polar n-C{sub 6}D{sub 14} is on average a factor of 21 times faster than for the cation. Exploitation of the unique structural and transport properties of these mixtures may lead to new opportunities for designer solvents for enhanced chemical reactivity and interface science.},
doi = {10.1063/1.4916388},
journal = {Journal of Chemical Physics},
number = 12,
volume = 142,
place = {United States},
year = {Sat Mar 28 00:00:00 EDT 2015},
month = {Sat Mar 28 00:00:00 EDT 2015}
}