IR and UV spectroscopy reveal the molecular folding resulting from the competition between two non-covalent intramolecular interactions: cation-anion and cation-pi.
Ion pairs are ubiquitous in Nature, from sea water and aerosols, to living organisms. Being the very first step of crystallization of ionic species and influencing the properties of ion-concentrated solutions or ionic liquids, they also play a key role in countless applications. Although they are met in many areas of Physics, Chemistry and Biology, their characterization is complicated by the co-existence of several types of pairs and their elusive nature in solution.
In this context, this project aims at documenting net neutral ion pairs by investigating them in the gas phase using IR and UV laser spectroscopic techniques which enable us to characterize each type of ion pair individually. This experimental approach is combined with theoretical approaches aiming at identifiying the ion pairs formed in the gas phase, and extrapolating their vibrational signature in solution. Several questions are investigated by this project:
This project is funded by:
S. Habka, T. Véry, J. Donon, V. Vaquero-Vara, B. Tardivel, F. Charnay-Pouget, M. Mons, D.J. Aitken, V. Brenner, E. Gloaguen in preparation
S. Habka, "Spectroscopie optique des paires d’ions : De la caractérisation des modèles en phase gazeuse à l’identification des paires d’ions en solution", PhD thesis Université Paris-Saclay (2017)
S. Habka, V. Brenner, M. Mons, E. Gloaguen J. Phys. Chem. Lett. 7 (7) 1192 (2016)