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

YoungAh Kwon, Chiho Lee, Sungnam Park

Research output: Contribution to journalArticle

9 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 languageEnglish
Pages (from-to)38-45
Number of pages8
JournalChemical Physics
Volume445
DOIs
Publication statusPublished - 2014 Dec 5

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Vibrational spectroscopy
acetonitrile
Ions
Nitriles
Molecules
nitriles
spectroscopy
molecules
ions
interactions
Pumps
pumps
Infrared radiation
probes
Infrared spectroscopy
vibration mode
infrared spectroscopy

Cite this

Effect of ion-molecule interaction on fermi-resonance in acetonitrile studied by ultrafast vibrational spectroscopy. / Kwon, YoungAh; Lee, Chiho; Park, Sungnam.

In: Chemical Physics, Vol. 445, 05.12.2014, p. 38-45.

Research output: Contribution to journalArticle

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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.

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KW - IR pump-probe (IR PP) spectroscopy

KW - Two-dimensional infrared (2DIR) spectroscopy

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