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Studying the Dynamics of Photochemical Reactions via Ultrafast Time-Resolved Infrared Spectroscopy of the Local Solvent
journal contribution
posted on 2015-12-17, 04:04 authored by Son C. Nguyen, Justin P. Lomont, Benjamin W. Caplins, Charles B. HarrisConventional ultrafast spectroscopic
studies on the dynamics of
chemical reactions in solution directly probe the solute undergoing
the reaction. We provide an alternative method for probing reaction
dynamics via monitoring of the surrounding solvent. When the reaction
exchanges the energy (in form of heat) with the solvent, the absorption
cross sections of the solvent’s infrared bands are sensitive
to the heat transfer, allowing spectral tracking of the reaction dynamics.
This spectroscopic technique was demonstrated to be able to distinguish
the differing photoisomerization dynamics of the trans and cis isomers of stilbene in acetonitrile solution.
We highlight the potential of this spectroscopic approach for studying
the dynamics of chemical reactions or other heat transfer processes
when probing the solvent is more experimentally feasible than probing
the solute directly.