Physical properties and intermolecular dynamics of an ionic liquid compared with its isoelectronic neutral binary solution

Hideaki Shirota, Ed Castner

Research output: Contribution to journalArticle

109 Citations (Scopus)

Abstract

In this study, we address the following question about room-temperature ionic liquids (RTILs). Are the properties of a RTIL more dependent on the charges of the molecular ions or on the fact that the liquid is a complex mixture of two species, one or both of which are asymmetric? To address this question and to better understand the interactions and dynamics in RTILs, we have prepared the organic ionic liquid 1-methoxyethylpyridimum dicyanoamide (MOEPy +/DCA -) and compared this RTIL with the analogous isoelectronic binary solution, comprised of equal parts of 1-methoxyethylbenzene (MOEBz) and dicyanomethane (DCM). In essence, we have created a RTIL and a nearly identical neutral pair in which we have effectively turned off the charges. To understand the intermolecular interactions in both of these liquids, we have characterized the bulk density and shear viscosity. Using femtosecond optical Kerr effect spectroscopy, we have also characterized the intermolecular vibrational dynamics and diffusive reorientation. To verify that the shape, polarizability, and electronic structure of the RTIL ions and the components of the neutral pair are truly quite similar, we have carried out density functional theory calculations on the individual molecular ion and neutral species.

Original languageEnglish
Pages (from-to)9388-9392
Number of pages5
JournalJournal of Physical Chemistry A
Volume109
Issue number42
DOIs
Publication statusPublished - Oct 27 2005

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Ionic Liquids
Physical properties
physical properties
liquids
room temperature
Ions
Temperature
molecular ions
Optical Kerr effect
Shear viscosity
Liquids
Complex Mixtures
Electronic structure
Density functional theory
Kerr effects
Spectroscopy
retraining
interactions
viscosity
density functional theory

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this

Physical properties and intermolecular dynamics of an ionic liquid compared with its isoelectronic neutral binary solution. / Shirota, Hideaki; Castner, Ed.

In: Journal of Physical Chemistry A, Vol. 109, No. 42, 27.10.2005, p. 9388-9392.

Research output: Contribution to journalArticle

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