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Mode-Selective Laser Control of Palladium Catalyst Decomposition.
Patrick J J Carr1, Michael J Lecours1, Michael J Burt1
1Department of Chemistry, University of Waterloo , Waterloo, ON N2L 3G1, Canada.
The Journal of Physical Chemistry Letters
|December 16, 2017
Summary
Researchers show that specific molecular vibrations in palladium catalysts can steer chemical reactions. This control over reactivity, previously unseen in larger molecules, can be switched off with chemical changes.
Area of Science:
- Chemical Physics
- Catalysis
- Molecular Dynamics
Background:
- Molecules are generally assumed to react based solely on total energy (ergodicity).
- Nonergodic behavior, where initial states influence reactivity, is rare, especially in larger molecules.
- Previous studies have not reported nonergodic behavior in larger covalently bound species.
Purpose of the Study:
- To investigate vibrational mode-selective reactivity in palladium catalysts.
- To determine if specific molecular vibrations can control reaction pathways.
- To explore methods for controlling or disabling this selective behavior.
Main Methods:
- Utilizing solvent-tagged gas-phase palladium catalysts.
- Employing infrared laser excitation tuned to specific molecular vibrations.
- Analyzing reaction pathways influenced by selective vibrational excitation.
- Investigating the effect of chemical substitution on selectivity.
Main Results:
- Demonstrated vibrational mode-selective behavior in palladium catalysts.
- Showed that excitation of different molecular vibrations leads to distinct reaction pathways.
- Confirmed that chemical substitution can "turn off" this mode-selective reactivity.
- Extended the observation of nonergodic behavior to larger molecular systems.
Conclusions:
- Vibrational mode selectivity offers a new mechanism for controlling chemical reactions in larger molecules.
- This control is achievable in palladium catalyst systems via targeted infrared excitation.
- The observed nonergodic behavior can be modulated through chemical design, offering tunable catalytic properties.
