Intermolecular interactions and dynamics of room temperature ionic liquids that have silyl- and siloxy-substituted imidazolium cations

Hideaki Shirota; James F. Wishart; Edward W. Castner

doi:10.1021/jp067126o

Intermolecular interactions and dynamics of room temperature ionic liquids that have silyl- and siloxy-substituted imidazolium cations

Hideaki Shirota, James F. Wishart, Edward W. Castner

Rutgers University

Research output: Contribution to journal › Article › peer-review

98 Citations (Scopus)

Abstract

The intermolecular interactions and dynamics of novel ionic liquids with alkylsilyl and alkylsiloxy substitutions on the cations are studied by measuring the intermolecular vibrational spectra and reorientational dynamics using femtosecond Kerr effect methods. The new ionic liquids include 1-dimethylphenylsilylmethyl-3-methylimidazolium (PhSi-mim⁺), and 1-methyl-3-pentamethyldisiloxymethylimidazolium (SiOSi-mim⁺) cations paired with the bis(trifluoromethylsulfonyl)imide (NTf₂^-) anion. Measured ionic liquid viscosities are surprisingly low for such bulky cation substituents. DFT electronic structure calculations on the isolated ions provide additional information about the electrostatic interactions.

Original language	English
Pages (from-to)	4819-4829
Number of pages	11
Journal	Journal of Physical Chemistry B
Volume	111
Issue number	18
DOIs	https://doi.org/10.1021/jp067126o
Publication status	Published - May 10 2007

ASJC Scopus subject areas

Physical and Theoretical Chemistry
Surfaces, Coatings and Films
Materials Chemistry

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abstract = "The intermolecular interactions and dynamics of novel ionic liquids with alkylsilyl and alkylsiloxy substitutions on the cations are studied by measuring the intermolecular vibrational spectra and reorientational dynamics using femtosecond Kerr effect methods. The new ionic liquids include 1-dimethylphenylsilylmethyl-3-methylimidazolium (PhSi-mim+), and 1-methyl-3-pentamethyldisiloxymethylimidazolium (SiOSi-mim+) cations paired with the bis(trifluoromethylsulfonyl)imide (NTf2-) anion. Measured ionic liquid viscosities are surprisingly low for such bulky cation substituents. DFT electronic structure calculations on the isolated ions provide additional information about the electrostatic interactions.",

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