Dynamics of ion assembly in solution: 2DIR spectroscopy study of LiNCS in benzonitrile

Minbiao Ji; Sungnam Park; Kelly J. Gaffney

doi:10.1021/jz100486x

Dynamics of ion assembly in solution: 2DIR spectroscopy study of LiNCS in benzonitrile

Minbiao Ji, Sungnam Park, Kelly J. Gaffney

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31 Citations (Scopus)

Abstract

The solute-solvent interaction dictates the equilibrium structure of ionic assemblies in solution, ranging from free ions, ion pairs, ion-pair dimers, and ion-pair tetramers to nanoparticles and ionic crystals. We use two-dimensional infrared (2DIR) spectroscopic measurements of the antisymmetric CN stretch of thiocyanate (NCS^-) to study the equilibrium chemical exchange between the spectrally distinct ion pair and the ion-pair dimer in benzonitrile. We observe this chemical exchange to occur with a 36 ± 4 ps time constant. Our measurement indicates that 2DIR will provide a useful tool for investigating the dynamics of ion assembly in solution.

Original language	English
Pages (from-to)	1771-1775
Number of pages	5
Journal	Journal of Physical Chemistry Letters
Volume	1
Issue number	12
DOIs	https://doi.org/10.1021/jz100486x
Publication status	Published - 2010 Jun 17

ASJC Scopus subject areas

General Materials Science
Physical and Theoretical Chemistry

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abstract = "The solute-solvent interaction dictates the equilibrium structure of ionic assemblies in solution, ranging from free ions, ion pairs, ion-pair dimers, and ion-pair tetramers to nanoparticles and ionic crystals. We use two-dimensional infrared (2DIR) spectroscopic measurements of the antisymmetric CN stretch of thiocyanate (NCS-) to study the equilibrium chemical exchange between the spectrally distinct ion pair and the ion-pair dimer in benzonitrile. We observe this chemical exchange to occur with a 36 ± 4 ps time constant. Our measurement indicates that 2DIR will provide a useful tool for investigating the dynamics of ion assembly in solution.",

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AU - Park, Sungnam

AU - Gaffney, Kelly J.

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AB - The solute-solvent interaction dictates the equilibrium structure of ionic assemblies in solution, ranging from free ions, ion pairs, ion-pair dimers, and ion-pair tetramers to nanoparticles and ionic crystals. We use two-dimensional infrared (2DIR) spectroscopic measurements of the antisymmetric CN stretch of thiocyanate (NCS-) to study the equilibrium chemical exchange between the spectrally distinct ion pair and the ion-pair dimer in benzonitrile. We observe this chemical exchange to occur with a 36 ± 4 ps time constant. Our measurement indicates that 2DIR will provide a useful tool for investigating the dynamics of ion assembly in solution.

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Dynamics of ion assembly in solution: 2DIR spectroscopy study of LiNCS in benzonitrile

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