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Construction And Investigation Of Supramolecular Frameworks Based On Cucurbit[8]uril Macrocyclic Molecular Container And Their Adsorption Properties

Posted on:2019-09-15Degree:MasterType:Thesis
Country:ChinaCandidate:P P WangFull Text:PDF
GTID:2371330545459377Subject:Inorganic Chemistry
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Supramolecular Organic Frameworks(SOFs)are assemblies formed via weak intermolecular non-covalent interactions,such as hydrogen bonds,van der waals force,π-π stacking,CH···π and electrostatic interactions.Compared to the strong force,Metal-Organic Frameworks(MOFs)and Covalent Organic Frameworks(COFs),SOFs exhibit low density,high specific surface area,easy purification,renewable and other advantages.Therefore,it is convenient to exploit various building-blocks with multiple interactions to enrich their structures.Based on these advantages,SOFs find widely applications such as gas storage,separation,drug delivery,photoelectric devices and catalysis.Cucurbit[n]urisl(CB[n])are new kinds of macrocycle with large rigid hydrophobic cavity and two identical carbonyl fringed portals,which is capable to encapsulate electron deficient molecules.Based on this property,we plan to exploit CB[n] and electron deficient guests to build SOFs.Firstly,we have designed a molecular chaperone to induce low-soluble CB[8] molecules in water to assemble a crystalline nanotubular framework 1.Analysis of X-ray single crystal structure shows that 1 has an ordered one-dimensional channel.XRD,TGA and gas adsorption results show that 1 has a permanent porosity and high thermal stability,and compared with N2,CH4 and H2,1 has high selectivity for CO2.Compared with the amorphous CB[8],the CO2 selectivity of 1 can be attributed to the high adsorption enthalpy of nanocrystalline porous materials for CO2.This work is the first report of the application of supramolecular frame material based on CB[8] in gas adsorption,which has potential application in relieving greenhouse gas effect.
Keywords/Search Tags:Supramolecular chemistry, Supramolecular Organic Frameworks, Cucurbit[n]urils, Macrocycle, Gas adsorption
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