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Accueil du site > Production scientifique > Chirality-dependent structuration of protonated or sodiated polyphenylalanines : IRMPD and ion mobility studies

Chirality-dependent structuration of protonated or sodiated polyphenylalanines : IRMPD and ion mobility studies

Date de publication: 9 décembre 2015

V. Lepere, K. Le Barbu-Debus, C. Clavaguéra, D. Scuderi, G. Piani, A.-L. Simon, F. Chirot, L. MacAleese, P. Dugourd, A. Zehnacker
Phys. Chem. Chem. Phys. 18 1807-1817 (2016). DOI

Travail réalisé sur le site de l’Université Paris Sud.

Abstract

Ion mobility experiments are combined with Infra-Red Multiple Photon Dissociation (IRMPD) spectroscopy and quantum chemical calculations for assessing the role of chirality in the structure of protonated and sodiated di- or tetra-peptides. Sodiated systems show a strong chirality dependence of the competition between Na+⋯O and Na+⋯π interactions. Chirality effects are more subtle in protonated systems and manifest themselves by differences in the secondary interactions such hydrogen bonds between neutral groups or those involving the aromatic rings.