title: Highly enantioselective adsorption of small prochiral molecules on a chiral intermetallic compound.
abstract: Intrinsically chiral surfaces of intermetallic compounds are shown to be novel materials for enantioselective processes. Their advantage is the significantly higher thermal and chemical stability, and therefore their extended application range for catalyzed chiral reactions compared to surfaces templated with chiral molecular modifiers or auxiliaries. On the Pd1 -terminated PdGa(111) surface, room-temperature adsorption of a small prochiral molecule (9-ethynylphenanthrene) leads to exceptionally high enantiomeric excess ratios of up to 98 %. Our findings highlight the great potential of intrinsically chiral intermetallic compounds for the development of novel, enantioselective catalysts that can be operated at high temperatures and potentially also in harsh chemical environments.
authors: Empa. Swiss Federal Laboratories for Materials Science and Technology, Überlandstrasse 129, 8600 Dübendorf (Switzerland) http://www.surfaces.ch.
authors: Jan
authors: J
authors: Prinz
authors: Oliver
authors: O
authors: Gröning
authors: Harald
authors: H
authors: Brune
authors: Roland
authors: R
authors: Widmer
mesh_terms: D000327:Adsorption; D002384:Catalysis; D003460:Crystallization; D005708:Gallium / Q000737:chemistry; D006358:Hot Temperature; D007202:Indicators and Reagents; D008670:Metals / Q000737:chemistry*; D017348:Microscopy, Electron, Scanning Transmission; D008958:Models, Molecular; D010165:Palladium; D010616:Phenanthrenes / Q000737:chemistry; D013237:Stereoisomerism
chemical_list: C096666:9-ethynylphenanthrene; D007202:Indicators and Reagents; D008670:Metals; D010616:Phenanthrenes; D010165:Palladium; D005708:Gallium
keywords: adsorption; chirality; enantioselectivity; intermetallic compounds; scanning probe microscopy