The Construction Of Pillar[5]arenes-based Supramolecular Organic Frameworks(SOFs) And Their Applications

Over the past half of century,supramolecular chemistry has drawn more and more attention due to the practical application in series of fields.In recent years,supramolecular organic frameworks（SOFs）constructed by the method of supramolecular chemistry were extensively applied in fields of catalyst,drug delivery,and so on.Therefore,the SOFs were the center of attention.In this paper,a series of supramolecular organic frameworks（SOFs）was designed and constructed,which were also successfully applied in the recognition and detection of ions and molecules,as well as separation of toxic ions.This paper will be divided into four parts to discuss the construction of supramolecular organic framework and its properties in different fields.In this chapter,we introduced the definition of supramolecular organic frameworks,construction of multi-dimensional supramolecular organic frameworks,which were also classified from the different bulding blocks and application.In addition,we have summarized its application in fields of ions or molecules separation and sensing,gas storage,catalysis and drug delivery.In this chapter,a novel supramolecular organic framework（SOF-THBP）was constructed by bis-thioacetylhydrazine functionalized pillar[5]arenes.The SOF-THBP shows a fluorescent response for Fe³⁺,Cr³⁺,Hg²⁺and Cu²⁺ions.The xerogel of SOF-THBP shows excellent recyclable separation properties for these metal ions and the absorption rates were up to 99.29%.More interestingly,by rationally introducing these metal ions into the SOF-THBP,a series of metal-ion-coordinated SOFs（MSOFs）such as MSOF-Fe,MSOF-Hg and MSOF-Cu were constructed.These metal ions coordinated MSOFs could selectively sense F^-,Br^-and l-Cys,respectively.The detection limits of these MSOFs for F^-,Br^-and l-Cys were about 10^-8 M.In this chapter,a supramolecular organic framework gel（SOF-TPN-G）with strong aggregation induced emission（AIE）was successfully constructed from novel tri-pillar[5]arene-based supramolecular polymer networks.The SOF-TPN-G shows fluorescent response for multiple metal ions.Interestingly,by introducing Fe³⁺,Cu²⁺,Cr³⁺,Ag⁺,Tb³⁺and Eu³⁺into the SOF-TPN-G,respectively,a series of metallogels（SOF-Ms）with multi-colour fluorescence were obtained.Moreover,based on these gels,an eight-unit sensor array was successfully developed,which shows high sensitive fluorescent response for Fe³⁺,Cu²⁺,Cr³⁺,Ag⁺,Tb³⁺,Eu³⁺,F^-,CN^-,HSO₄^-,His,Ser and Cys.Among them,the detection for Fe³⁺,Cr³⁺,Tb³⁺,Eu³⁺,CN^-,F^-and Ser reached ultrasensitive level,the lowest limit of the detections（LODs）for these ions and molecular are 7.90×10^-9,9.20×10^-9,6.60×10^-9,6.80×10^-10,3.83×10^-9,3.26×10^-9 and 3.37×10^-9 M,respectively.More importantly,the xerogel of SOF-TPN-G shows excellent separation properties for Fe³⁺,Cu²⁺,Cr³⁺,Ag⁺,Tb³⁺and Eu³⁺,the absorption percentages of the xerogel for above metal ions were in the range of 98.30%to 99.95%.These AIE organogel/metallogels are novel multi-responsive fluorescent materials for high efficient detection and seperation of multi-analyte.In this chapter,we report a novel and efficient method for ultrasensitive detection formaldehyde in gas and solutions by a catalyst pre-placed sensor based on pillar[5]arene derivative（DP5J）.By the catalyzation of（CF₃SO₃）₂Bi,the DP5J could selectively and sensitively sense formaldehyde through an aggregation-induced emission（AIE）“turn-on”response within 7.5 seconds and the detection limit（LOD）for formaldehyde is 3.27×10^-9 M.Interesting,under the inducing of formaldehyde,a novel pllar[5]arene-based 2D supramolecular organic framework was successfully constructed.Moreover,a FA test kit was prepared by loading the catalyst（CF₃SO₃）₂Bi pre-placed DP5J sensor（DP5J-Bi）on a silica gel plate.The test kit could conveniently and efficiently detect formaldehyde gas or solution with ultrasensitivity.Interestingly,the catalysts pre-placed method and FA reaction induced AIE fluorescence“turn-on”mechanism is a novel approach to achieve ultrasensitive detection of FA.Importantly,it?s also a novel approach for the efficient detection of other volatile organic compounds（VOCs）.