Periodic Mesoporous Organosilica Derivatives Bearing a High Density of Metal Complexes on Pore Surfaces

摘要

Periodic mesoporous organosilicas (PMOs) synthesized from alkoxysilane precursors bridged with organic moieties, RfSi-(OR')3]_n n≥2, R = organic group, R' = CH3, C2H5, etc. by surfactant-directed self-assembly are a new class of functional materials that have well-defined nanoporous structures and highly functional organic groups in the silica walls, It is preferable to incorporate organic groups in the pore walls rather than to graft them on the wall surfaces because in the former case the organic groups offer little resistance to the diffusion of molecules and ions in the mesochannels and are quite resistant to leaching. Many PMOs containing bridging organic groups (R) that range from aliphatic and aromatic hydrocarbons to heterocycles and metal complexes have been reported, Incorporating metal complexes into PMO frame- works is particularly important because metal complexes possess unique features such as catalytic activity, luminescence emission, redox properties, and excited-state reactivity.