Issue 34, 2015

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

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

Supplementary files

Article information

Article type
Paper
Submitted
14 Apr 2015
Accepted
27 Jul 2015
First published
28 Jul 2015
This article is Open Access
Creative Commons BY license

Phys. Chem. Chem. Phys., 2015,17, 21902-21911

Author version available

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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