Properties Of Supramolecular Self–assembly Entities Base On Cucurbit[n]urils With Polyacids

Polyacids, also known as Polyoxometalates(POMs) or metal oxide clusters anion, are composed of two or more inorganic oxygen acid condensation. Haveing both acidic and redox properties, they can soluble in water and other oxygen-containing organic solvents.POMs have showed a good prospect in the fields of catalytic chemistry,medicinal chemistry,and functional materials with their unique structure and outstanding properties.Cucurbit[n]urils(Q[n] or CB[n]) is a new type of macrocyclic compounds.Structurely, the Q[n]s has a hollow ring hydrophobic cavity,which can contain small organic molecules and two same size open ports of polar carbonyl oxygen atoms, and can interact with metal ion. What's more,Cucurbit[n]urils' outer–surface has a strong positive charge, which can have the outer–surface interactions with anions.In this paper, we have designed and synthesized a series of novel Q[n]?POMs?based supramolecular self–assemblies entities based on Cucurbit[n]urils' outer–surface interactions with the contained elements Mo, W formed polyoxometalats(POMs).Q[n]?POMs self–assemblies entities are insoluble in water,acid and organic solvents,and they are stable solid acid,which solve the problem to recycle POMs with good solubility.IR spectrum,X–ray powder diffraction,thermal analysis and scanning electron microscopy are used to characterize the Q[n]–POMs self–assemblies entities,and study their properties of catalytic and adsorbability. The specific contents of the study are as followed.Four types of different size Cucurbit[n]urils(Q[n], n=5,6,7,8) and three Keggin polyacids(H3PW12O40, abbreviated as PW12; H4 Si W12O40], Si W12; H3PMo12O40,PMo12) and three polyacids' salt {(NH3)6Mo7O24, N6Mo7;(NH3)3P Mo12N3O40,N3PMo12;(NH4)10W12O42, N10W12) are selected to have self-assembly interaction, and then synthesize a series of Q[n]?POMs self–assemblies entities: Q[n]?PW12,Q[n]?Si W12, Q[n]?PMo12, Q[n]?N6Mo7, Q[n]?N10W12 and Q[n]? N3PMo12,and they was characterized by IR spectrum, X–ray powder diffraction, thermal analysis and scanning election microscope.Q[6]?Si W12, Q[5]?Si W12, Q[5]?PW12, Q[6]?PW12, Q[7]?PW12 and Q[8]?PW12 are used to do photocatalystic degradation experiment of Methyl Orange in the solution, in order to study the influence of Methyl Orange's photocatalystic degradation under different amount of catalyst,p H and light sources and then analyze the degradation products.Then the study investigated the adsorption performance of a series of Q[n]?POMs self–assemblies entities to Methanol,Ethanol,Acetone,Acetonitrile,Ether, Dichloromethane and Tetrachloromethane.