Physics
Scientific paper
Jun 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009mss..confera10g&link_type=abstract
"International Symposium On Molecular Spectroscopy, 64th Meeting, Held 22-26 June, 2009 at Ohio State University. http://molspec
Physics
Infrared/Raman
Scientific paper
We present Ar-predissociation spectra of cationic systems involving imidazole (Im): Im^{+}\cdotAr, Im\cdotH^{+}\cdotAr, Im_2\cdotH^{+}\cdotAr, and Im_3\cdotH^{+}\cdotAr in the range of 3000-3800 cm^{-1}. We track the evolution of the C-H and N-H stretching vibrational frequencies as a function of the number of imidazole groups present in the cluster. The C-H stretching frequencies red-shift while the intensities of these transitions appear to equalize with the addition of imidazole molecules to the motif. Also, as the length of the proton-bound imidazole chain increases, we notice a blue shift in the frequency of the free (non-Ar-solvated) N-H stretch toward that of the analogous vibrational mode in neutral imidazole (3518 cm^{-1}). The disappearance of Ar-bound N-H stretch when a second imidazole is added to the Im\cdotH^{+}\cdotAr cluster strongly suggests a large-scale red shift of this feature as this proton becomes shared between two imidazole groups, illustrating the construction of an intermolecular proton-transfer scaffold. These data represent a microscopic model system for the ongoing effort to develop imidazole-based anhydrous PEM (Proton-Exchange Membrane) fuel cells.
M. Y. Choi, R. E. Miller, J. Phys. Chem. A 110, 30 (2006).
Gardenier George H.
Johnson Mark A.
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