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Issue 34, 2015
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IR spectroscopy of protonated leu-enkephalin and its 18-crown-6 complex embedded in helium droplets

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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.

Graphical abstract: IR spectroscopy of protonated leu-enkephalin and its 18-crown-6 complex embedded in helium droplets

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Publication details

The article was received on 14 Apr 2015, accepted on 27 Jul 2015 and first published on 28 Jul 2015


Article type: Paper
DOI: 10.1039/C5CP02172C
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Citation: Phys. Chem. Chem. Phys., 2015,17, 21902-21911
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    IR spectroscopy of protonated leu-enkephalin and its 18-crown-6 complex embedded in helium droplets

    A. I. González Flórez, D. Ahn, S. Gewinner, W. Schöllkopf and G. von Helden, Phys. Chem. Chem. Phys., 2015, 17, 21902
    DOI: 10.1039/C5CP02172C

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