Mécanismes d’induction de chiralité en catalyse hétérogène

Authors: Lemay, Jean-Christian
Advisor: McBreen, Peter Hugh
Abstract: Chemisorption of a chiral modifier creates active chiral sites on catalytic surfaces. This central concept of asymmetric heterogenous catalysis is at the heart of this thesis. The chiral modifier forces a chirality on the pro-chiral substrate, and in doing so, preserves or enhances the catalytic activity of the catalytic metal surface. Non-covalent intramolecular interactions provide the stereodirecting force needed to steer the reaction towards an enantiomer, and affect the catalytic activity. Such interactions on surfaces are still difficult to rationalize. Thus, surface-science studies of asymmetric heterogenous catalysis offer insight into the fundamental intermolecular forces at play, and foster a better understanding of surface chemistry. Scanning tunneling microscopy (STM) allows one to study surface catalytic processes at the molecular scale. In parallel, recent progress in density functional theory (DFT) give a more accurate description of chemisorption and van derWaals interactions. Combining these two approaches makes possible single-site studies of catalytic processes. Different pairs of chiral modifiers and pro-chiral substrates are studied here along these lines.
Document Type: Mémoire de maîtrise
Issue Date: 2014
Open Access Date: 24 April 2018
Permalink: http://hdl.handle.net/20.500.11794/26704
Grantor: Université Laval
Collection:Thèses et mémoires

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