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  • Title: IR spectroscopy of protonated leu-enkephalin and its 18-crown-6 complex embedded in helium droplets.
    Author: González Flórez AI, Ahn DS, Gewinner S, Schöllkopf W, von Helden G.
    Journal: Phys Chem Chem Phys; 2015 Sep 14; 17(34):21902-11. PubMed ID: 26234567.
    Abstract:
    Ultracold IR spectra of the protonated five amino acid peptide leu-enkephalin (Tyr-Gly-Gly-Phe-Leu) embedded in superfluid helium droplets have been recorded using a free-electron laser as radiation source. The results show resolved spectra, which are in good agreement with theoretical calculations, as well as with the available gas-phase data indicating that the helium environment does not induce a significant matrix-shift. In addition, the effect of the interaction between the charge and the peptide backbone has been further investigated by complexing protonated leu-enkephalin with one 18-crown-6 molecule. Good agreement between the experimental and theoretical results allow for an assignment of a preferred molecular structure.
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