Synthesis And Recognition Properties Of Supramolecular Gels And A Water-Soluble Pillar[5]Arene

supramolecular chemistry underwent a sudden arise in last few decades,and attracted considerable attention in many fields due to its potential applications.The design and synthesis supramolecular compounds is one important part of the supramolecular chemistry.On the basis of current theory and research achievement,we design and constructed two type of supramolecular compounds,and mainly focus on their ability to identify ion.Chapter 1 Mainly introduces the concept,driving force,history of development and application of supramolecular compounds.From supramolecular compounds which uses Multiple H-bonds and?-?stacking interactions,to Macrocyclic supramolecular compounds such as Cyclodextrins,Cucurbituril and Calixarene.The research achievement of low molecular weight organic gel?LMOGs?and pillararene to identify ion is what we especially noted.Chapter 2 Design and synthesis a novel LMOGs G1 by rationally introduce ion binding site,multiple self-assembly driving forces offered group and fluorescent signal group to benzimidazole,and studied its ability to gelation and continually identify Fe³⁺and F^-.We found that in the presence of the?-?stacking between benzimidazole groups of OG and intersecting and intertwining of alkyl chains,G1 can self-assemble to gel at very low level of concentration with aggregation-induced emission?AIE?.subsequently research revealed that G1 could identify Fe³⁺at different concentration accompanied different result.At high level of concentration?0.8%m/v?,Fe³⁺can quench AIE of OG,and restore by adding F^-,according to this,OG can be used as a specificity and continuity chemosensor for Fe³⁺and F^-.At the low level of concentration,Fe³⁺can destroy OG's gel structure,make OG undergo a“gel-sol”transition process,then we discussed the mechanism of gelation process and identification process based on the experimental results.Chapter 3 Synthesis a water soluble pillar[5]arene?WP5?and a guest molecule G2,and studied their self-assemble process and the ability of the supramolecular compounds constructed by these tow to identify Fe³⁺.The experimental results suggested that WP5 and G2 can form supramolecular compound HG-8 in stoichiometric ratio of 1:1.We then testified that the change of fluorescent is because of that G2 was packaged by the cavity of WP5.After this,we studied the ability of HG-8 to specificity identify Fe³⁺,among twelve different kind of metal ion(Mg²⁺,Ca²⁺,Cr³⁺,Co²⁺,Ni²⁺,Cu²⁺,Fe³⁺,Zn²⁺,Ag⁺,Cd²⁺,Hg²⁺,Pb²⁺),HG-8 can specificity identify Fe³⁺,the possible mechanism of identification process was subsequently discussed.In view of this,we provide a new route to design and synthesis supramolecular compound which can detect metal ion in aqueous solution.Chapter 4 Summary.