Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Infrared Spectroscopy of Imidazole Trimer in Helium Nanodroplets: Free NH Stretch Mode

  • Lee, Seul-Ki (Department of Chemistry and Research Institute of Natural Science, Gyeongsang National University) ;
  • Lee, Seung-Jun (Department of Chemistry and Research Institute of Natural Science, Gyeongsang National University) ;
  • Ahn, Ah-Reum (Department of Chemistry and Research Institute of Natural Science, Gyeongsang National University) ;
  • Kim, Yu-Sic (Department of Chemistry and Research Institute of Natural Science, Gyeongsang National University) ;
  • Min, Ah-Reum (Department of Chemistry and Research Institute of Natural Science, Gyeongsang National University) ;
  • Choi, Myong-Yong (Department of Chemistry and Research Institute of Natural Science, Gyeongsang National University) ;
  • Miller, Roger E. (Department of Chemistry, The University of North Carolina at Chapel Hill)
  • Received : 2010.01.04
  • Accepted : 2011.01.06
  • Published : 2011.03.20
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Abstract

We report the first vibrational band assignment of imidazole trimer (IMT) solvated in helium nanodroplets. Several congested vibrational bands of imidazole (IM) clusters were obtained in the frequency region of $3513-3515\;cm^{-1}$ and vibrationally resolved due to the extremely low temperature (0.37 K) and very weak solutesolvent interaction environments of helium droplets. The unambiguous free NH band assignment was achieved with an aid of pick-up oven temperature dependence and vibrational transition moment angle (VTMA) experiments as well as density functional theory (DFT) calculations. The band at $3514.3\;cm^{-1}$ is attributed to the free NH stretching mode of linear IMT clusters, easily formed by the dipole-dipole interactions of IM in ultracold helium nanodroplets.

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