Preparation Of Graphene Oxide Supported Metal Complex Hybrids And Their Application In Catalytic Reactions

Graphene is a two-dimensional (2D) monolayer carbon material which isconsisted of carbon atoms packing into honeycomb lattice tightly. Since it was firstreported in2004, it has attracted tremendous attention in the scientific world. At thesame time, more scientists began to do research on graphene nanomaterial. Grapheneoxide is treated as an idea carrier for supported catalysts because of its special2Dstructures, large surface area, rich functional groups and excellent properties. In thisstudy, graphene oxide supported palladium catalyst was prepared by immobilizingpalladium(?) onto graphene oxide surface through the in-situ coordinationinteraction with aminosilane ligand spacers and characterized by Fourier transforminfrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), Ramanspectroscopy?Scanning electronic microscopy (SEM) and Transmission electronmicroscopy (TEM). The catalytic activity of the catalyst was evaluated through thereactions.The main results obtained are as follows:1. The supported palladium catalyst was prepared by the in-situ coordinationbetween Pd(?) and aminosilane ligand that was covalently immobilized on grapheneoxide via the one-pot silylation. The loading of the palladium on the graphene oxidesurface was5.38wt%. We found that this catalyst afforded high catalytic activities forthe Suzuki coupling of various halogenobenzene and phenylboronic acids.2. A graphene oxide supported chiral salen Mn(?) complex catalyst has beensuccessfully prepared by immobilizing chiral salen Mn(?) complex onto grapheneoxide surface through the in–situ coordination interaction with aminosilane ligandspacers. Mn(salen) complex was successfully anchored and homogeneouslydistributed on the GO surface. The content of Mn in the catalyst was2.02wt%. Thiscatalyst showed high catalytic activities and excellent enantioselectivity for theasymmetric epoxidation of olefns.