Chemical Modification of Clay Interlayer with Metal Complexes and Application to the Catalytic Molecular Recognition Reactions

Abstract

Clay-supported metal complexes were prepared by various methods such as cation exchange, chemically anchored ligand, and interlayer-polymerized ligand methods. Multiple modification of smectites with metal complexes and various organic guests (tuning guests) can be applied to the preparation of catalysts for the molecular recognition reactions such as shape selective, chemoselective, regioselective, and asymmetric hydrogenations. Especially, chiral Rh-phosphine complexes intercalated in taeniorite with structural tuning guests exhibited notably high activity and high selectivity in the asymmetric hydrogenation of acetophenone due to the larger open space in their interlayer structure.