Hannover 2016 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 19: Posters 4: Novelties in Molecular Physics: Femtosecond Spectroscopy, Molecular Clusters, Cold Molecules and Helium Droplets

MO 19.28: Poster

Donnerstag, 3. März 2016, 16:30–19:00, Empore Lichthof

Micro Solvation of Glycine — •Matin Kaufmann, Raffael Schwan, Daniel Leicht, Devendra Mani, Gerhard Schwaab, and Martina Havenith — Lehrstuhl für Physikalische Chemie II, Ruhr-Universität Bochum

Glycine is the smallest amino acid and serves as a model system for the interaction of amino acids and water. In the gas phase, glycine is in its neutral form, while in crystal structure and aqueous solution it occurs as a zwitterion.

Theoretical [1] and experimental [2] studies on the micro solvation of glycine have been carried out, however, no unambiguous statement was made on the number of water molecules needed to transition from hydrogen bonded structures involving the neutral form of glycine to structures involving the zwitterionic form of glycine.

The helium nanodroplet isolation technique is established as a way to stabilize molecular aggregates and reactive species, making them accessible to spectroscopic studies. Infrared spectra of glycine in complexes with an increasing number of water molecules are recorded and the observed transitions are assigned utilizing ab initio calculations for most of the viable structures.

[1] S. M. Bachrach, J. Phys. Chem. A 2008, 112, 3722

[2] R. Ramaekers, J. Chem. Phys. 2004, 120, 4182