Berlin 2018 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 49: Soft Matter Physics: Emerging Topics, New Instruments and Methods
CPP 49.2: Vortrag
Mittwoch, 14. März 2018, 15:15–15:30, C 230
Initiation of bimolecular ground-state reaction via IR excitation — •Till Stensitzki1, Yang Yang1, Valeri Kozich1, Ashour A. Ahmed2,3, Florian Kössel1, Oliver Kühn3, and Karsten Heyne1 — 1Department of Physics, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany — 2Faculty of Science, Department of Chemistry, University of Cairo, 12613 Giza, Egyp — 3Institute of Physics, University of Rostock, Albert Einstein-Strasse 23-24, 18059 Rostock, German
Excitation of vibrations that participate in the reaction coordinate are believed to accelerate an otherwise thermally driven chemical reaction. Here, we demonstrate the acceleration the thermal driven chemical reaction between cyclohexanol and phenylisocyanate in THF. Upon excitation of the OH-stretching vibration of CH-ol we track bleaching signals of PHI and the urethane product band in real-time. Additionally, we determined reaction rate changes upon selective vibrational excitation with negligible heating of the sample and observed an increase of the reaction rate up to 24%. We utilized reaction acceleration between toluene-2,4-diisocyanate and 2,2,2-trichloroethane-1,1-diol to write a polyurethane square on the sample windows by femtosecond IR pulses.