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

MPS-Authors
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Gonzalez Florez,  Ana Isabel
Molecular Physics, Fritz Haber Institute, Max Planck Society;

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Ahn,  Doo-Sik
Molecular Physics, Fritz Haber Institute, Max Planck Society;

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Gewinner,  Sandy
Molecular Physics, Fritz Haber Institute, Max Planck Society;

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Schöllkopf,  Wieland
Molecular Physics, Fritz Haber Institute, Max Planck Society;

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Helden,  Gert von
Molecular Physics, Fritz Haber Institute, Max Planck Society;

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c5cp02172c.pdf
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Citation

Gonzalez Florez, A. I., Ahn, D.-S., Gewinner, S., Schöllkopf, W., & Helden, G. v. (2015). IR spectroscopy of protonated leu-enkephalin and its 18-crown-6 complex embedded in helium droplets. Physical Chemistry Chemical Physics, 17(34), 21902-21911. doi:10.1039/C5CP02172C.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0028-14FC-8
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.