Surface Science studies of Tartaric Acid on Ni(110): Chiral Footprints - Humblot, Vincent
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Enantioselective surface reactions represent the ultimate expression of selectivity in catalysis, involving stereodirecting processes where only one optical component of a product is formed. At present, however, the technique of catalyst modification is imperfect and the knowledge of the surface structure of the solid insufficient. The purpose of this thesis is to provide an understanding of the various phenomena occurring on solid enantioselective catalyst surfaces. For this purpose, model stereodirecting surfaces have been created by the adsorption of the chiral modifier, (R,R)-tartaric…mehr

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Produktbeschreibung
Enantioselective surface reactions represent the ultimate expression of selectivity in catalysis, involving stereodirecting processes where only one optical component of a product is formed. At present, however, the technique of catalyst modification is imperfect and the knowledge of the surface structure of the solid insufficient. The purpose of this thesis is to provide an understanding of the various phenomena occurring on solid enantioselective catalyst surfaces. For this purpose, model stereodirecting surfaces have been created by the adsorption of the chiral modifier, (R,R)-tartaric acid, and (S,S)-TA, on a well-defined Ni(110) single crystal surface. This chiral molecule is well known for stereodirecting the enantioselective hydrogenation of beta-keto-esters. RAIRS, TPD, LEED and STM data presented in this thesis show that when tartaric acid molecules adsorb on a Ni(110) surface, a complex adsorption phase diagram is obtained, where the chemical identity and two-dimensional order of the adsorbed species varies significantly as a function of coverage and temperature. The Chirality is expressed by creating a chiral footprint at the surface linked to the adsorbed molecule.
Autorenporträt
Vincent Humblot was born in 1974 in France. He carried out his Ph.D. Thesis at the University of Liverpool (UK) under Pr. Rasmita Raval supervision (graduated in 2001). He moved to Paris in 2004 to held a position of CNRS Researcher at the Laboratoire de Réactivité de Surface of the Université Pierre et Marie Curie, in Paris, France.