Effect of ion-molecule interaction on fermi-resonance in acetonitrile studied by ultrafast vibrational spectroscopy

Young Ah Kwon; Chiho Lee; Sungnam Park

doi:10.1016/j.chemphys.2014.10.017

Effect of ion-molecule interaction on fermi-resonance in acetonitrile studied by ultrafast vibrational spectroscopy

Young Ah Kwon, Chiho Lee, Sungnam Park

Department of Chemistry

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

18 Citations (Scopus)

Abstract

The nitrile stretch (ν₂) and the combination (ν₃₊₄) modes of acetonitrile (CH3CN) were found to be strongly coupled by Fermi-resonance. The frequencies of vibrational modes of acetonitrile in CH₃CN⋯Li⁺ complex were significantly varied due to a strong ion-molecule interaction. The intensity of the combination mode of CH₃CN in the FTIR spectrum was substantially enhanced in CH₃CN⋯Li⁺ complex because the combination band shifted closer to the nitrile stretch band. Here, Fermi-resonances in free CH₃CN and CH₃CN⋯Li⁺ complex were studied by ultrafast infrared pump-probe (IR PP) and two-dimensional infrared (2DIR) spectroscopy. Spectral features of Fermi-resonance observed in IR PP and 2DIR signals were presented and the effect of Li⁺ ion on Fermi-resonance were discussed.

Original language	English
Pages (from-to)	38-45
Number of pages	8
Journal	Chemical Physics
Volume	445
DOIs	https://doi.org/10.1016/j.chemphys.2014.10.017
Publication status	Published - 2014 Dec 5

Keywords

Fermi-resonance
IR pump-probe (IR PP) spectroscopy
Ion-molecule interaction
Two-dimensional infrared (2DIR) spectroscopy

ASJC Scopus subject areas

Physics and Astronomy(all)
Physical and Theoretical Chemistry

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10.1016/j.chemphys.2014.10.017

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title = "Effect of ion-molecule interaction on fermi-resonance in acetonitrile studied by ultrafast vibrational spectroscopy",

abstract = "The nitrile stretch (ν2) and the combination (ν3+4) modes of acetonitrile (CH3CN) were found to be strongly coupled by Fermi-resonance. The frequencies of vibrational modes of acetonitrile in CH3CN⋯Li+ complex were significantly varied due to a strong ion-molecule interaction. The intensity of the combination mode of CH3CN in the FTIR spectrum was substantially enhanced in CH3CN⋯Li+ complex because the combination band shifted closer to the nitrile stretch band. Here, Fermi-resonances in free CH3CN and CH3CN⋯Li+ complex were studied by ultrafast infrared pump-probe (IR PP) and two-dimensional infrared (2DIR) spectroscopy. Spectral features of Fermi-resonance observed in IR PP and 2DIR signals were presented and the effect of Li+ ion on Fermi-resonance were discussed.",

keywords = "Fermi-resonance, IR pump-probe (IR PP) spectroscopy, Ion-molecule interaction, Two-dimensional infrared (2DIR) spectroscopy",

author = "Kwon, {Young Ah} and Chiho Lee and Sungnam Park",

note = "Funding Information: This work was supported by the National Research Foundation of Korea (NRF) grants funded by the Korea government (Nos. 2013R1A1A2009991 and 20120005860) and the KETEP grant (No. 20104010100640). The IR pump-probe and 2DIR experiments were performed in the Multidimensional Spectroscopy Laboratory at the Korea Basic Science Institute (KBSI), Seoul Center. Publisher Copyright: {\textcopyright} 2014 Elsevier B.V. All rights reserved.",

year = "2014",

month = dec,

day = "5",

doi = "10.1016/j.chemphys.2014.10.017",

language = "English",

volume = "445",

pages = "38--45",

journal = "Chemical Physics",

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T1 - Effect of ion-molecule interaction on fermi-resonance in acetonitrile studied by ultrafast vibrational spectroscopy

AU - Kwon, Young Ah

AU - Lee, Chiho

AU - Park, Sungnam

N1 - Funding Information: This work was supported by the National Research Foundation of Korea (NRF) grants funded by the Korea government (Nos. 2013R1A1A2009991 and 20120005860) and the KETEP grant (No. 20104010100640). The IR pump-probe and 2DIR experiments were performed in the Multidimensional Spectroscopy Laboratory at the Korea Basic Science Institute (KBSI), Seoul Center. Publisher Copyright: © 2014 Elsevier B.V. All rights reserved.

PY - 2014/12/5

Y1 - 2014/12/5

N2 - The nitrile stretch (ν2) and the combination (ν3+4) modes of acetonitrile (CH3CN) were found to be strongly coupled by Fermi-resonance. The frequencies of vibrational modes of acetonitrile in CH3CN⋯Li+ complex were significantly varied due to a strong ion-molecule interaction. The intensity of the combination mode of CH3CN in the FTIR spectrum was substantially enhanced in CH3CN⋯Li+ complex because the combination band shifted closer to the nitrile stretch band. Here, Fermi-resonances in free CH3CN and CH3CN⋯Li+ complex were studied by ultrafast infrared pump-probe (IR PP) and two-dimensional infrared (2DIR) spectroscopy. Spectral features of Fermi-resonance observed in IR PP and 2DIR signals were presented and the effect of Li+ ion on Fermi-resonance were discussed.

AB - The nitrile stretch (ν2) and the combination (ν3+4) modes of acetonitrile (CH3CN) were found to be strongly coupled by Fermi-resonance. The frequencies of vibrational modes of acetonitrile in CH3CN⋯Li+ complex were significantly varied due to a strong ion-molecule interaction. The intensity of the combination mode of CH3CN in the FTIR spectrum was substantially enhanced in CH3CN⋯Li+ complex because the combination band shifted closer to the nitrile stretch band. Here, Fermi-resonances in free CH3CN and CH3CN⋯Li+ complex were studied by ultrafast infrared pump-probe (IR PP) and two-dimensional infrared (2DIR) spectroscopy. Spectral features of Fermi-resonance observed in IR PP and 2DIR signals were presented and the effect of Li+ ion on Fermi-resonance were discussed.

KW - Fermi-resonance

KW - IR pump-probe (IR PP) spectroscopy

KW - Ion-molecule interaction

KW - Two-dimensional infrared (2DIR) spectroscopy

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U2 - 10.1016/j.chemphys.2014.10.017

DO - 10.1016/j.chemphys.2014.10.017

M3 - Article

AN - SCOPUS:84910090454

SN - 0301-0104

VL - 445

SP - 38

EP - 45

JO - Chemical Physics

JF - Chemical Physics

ER -

Effect of ion-molecule interaction on fermi-resonance in acetonitrile studied by ultrafast vibrational spectroscopy

Abstract

Keywords

ASJC Scopus subject areas

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