Atomically Precise Preorganization of Open Metal Sites on Gold Nanoclusters with High Catalytic Performance

Angew Chem Int Ed Engl. 2021 Mar 1;60(10):5225-5229. doi: 10.1002/anie.202012499. Epub 2021 Jan 19.

Abstract

Gold nanoclusters with surface open sites are crucial for practical applications in catalysis. We have developed a surface geometric mismatch strategy by using mixed ligands of different type of hindrance. When bulky phosphine Ph3 P and planar dipyridyl amine (Hdpa) are simultaneously used, steric repulsion between the ligands will reduce the ligand coverage of gold clusters. A well-defined access granted gold nanocluster [Au23 (Ph3 P)10 (dpa)2 Cl](SO3 CF3 )2 (Au23 , dpa=dipyridylamido) has been successfully synthesized. Single crystal structural determination reveals that Au23 has eight uncoordinated gold atoms in the shape of a distorted bicapped triangular prism. The accessibility of the exposed Au atoms has been confirmed quantitatively by luminescent titration with 2-naphthalenethiol. This cluster has excellent performance toward selective oxidation of benzyl alcohol to benzaldehyde and demonstrates excellent stability due to the protection of negatively charged multidentate ligand dpa.

Keywords: amine ligands; cluster compounds; gold; luminescent titration; selective oxidation.