倍半硅氧烷组装型有机金属催化剂的合成及运用.pdf

／一 Abstract materials，assembled Siioxane-organichybrid bypolyhedraloligomeric anewclassof silicamaterialswith silsequioxane(POSS)units，representhybrid attractivefeaturesin thathasnotbeen particularly asymmetriccatalysis recognized traditional silica materialshave materials，these yet．Unlike mesoporous hybrid many both characteristicsand outstandingadvantages．First，theyembodyorganic-inorganic structuresinonesmall POSScavum cagelike nanoentity．Second，uniqueprovides additionalchannelsto reactantsand andcanfacilitatea transport products high efficient ofPOSSvertex asa catalytic reaction．Third，takingadvantage groups functionalizedisalsoconvenienttointroducevariousdesired bridge，it functionality can inthefield ontotheir be of frameworks，which applied asymmetriccatalysis．Last butnot structural ofvertex allows various least，the diversity functionalitymodifuing ontoPOSS new frameworks，which hydrophobic／hydrophil．cgroups opensup totailoritssurface tothe possibility physico—chemicalpropertiesaccording of tothe ofthese requirementsapplication．Owingpotentialadvantagesmaterials， This is