Research On Synthesis And Properties Of Novel AIE Sensor

With the development of chemical,pharmaceutical,pesticide and materials industries all over the world,various ions are playing an increasingly important role in these fields.Not only does Fe³⁺play a crucial role in biological processes,but also plays an important role in chlorophyll synthesis,nitrate reduction and other natural phenomena.So,it is very important to monitor its content.At the same time,ion pollution and ion poisoning events often occur,such as various Cu²⁺,Cr³⁺and Pb²⁺pollution,Hg²⁺and CN^-poisoning.Therefore,how to identify,detect and separate these ions,is very important!In view of these,our paper designs and synthesizes three kinds of sensors for the recognition of heavy metal ions,transition metal ions and toxic ion,and studies their ion recognition performance.The thesis consists of four parts:1.IntroductionThe paper introduces the background of ion recognition,aggregation-induced emission effect and its research progress,at the same time,the research of aggregation-induced emission effect based sensors in detection is introduced in detail,and the research progress in ion detection,molecular detection and biomolecular detection is emphasized.2.A novel long-alkyl-chained acylhydrazone-based supramolecular polymer gel for the ultrasensitive detection of multianalytesBy rationally introducing multi-self-assembly driving forces and coordination binding sites into the same molecule,a designed functional compound,G,was synthesized.Next,a supramolecular polymer material with blue AIE fluorescence,OGV?1%DMSO?,was constructed via hydrogen bonds,?-?stacking and van der Waals forces,which shows ultrasensitive detection of multianalytes?ions?.In other words,OGV showed fluorescence ultrasensitive response to Hg²⁺and Fe³⁺in aqueous solution,and the corresponding fluorescence minimum detection limit were 3.15×10^-9M and 2.83×10^-9M.More importantly,by introducing these metal ions into the OGV,metal ion-coordinated supramolecular polymer HgG and FeG were formed,which could sense CN^-and H₂PO₄^-in water solution with high selectivity and sensitivity.The corresponding minimum detection limit of fluorescence were3.72×10^-9M and 2.75×10^-9M,respectively.3.AIE based colorimetric and“turn-on”fluorescence Schiff base sensor for detecting Fe³⁺in an aqueous media and its applicationIn this chapter,we successfully constructed a coumarin schiff base derivative,AIE active sensor G1,for the recognition of Fe³⁺in aqueous solution by colorimetry and fluorescence enhancement in DMSO-H₂O?1:9,v/v,pH=7.2?solution.The color of the solution changed from colorless to orange after the addition of Fe³⁺,which can be observed by naked eye.The minimum detection limit of fluorescence is 4.88×10^-7M.What's more,sensor G1 has good anti-interference toward other common cations(Ca²⁺,Hg²⁺,Cu²⁺,Ag⁺,Cd²⁺,Co²⁺,Ni²⁺,Mg²⁺,Pb²⁺,Zn²⁺and Cr³⁺).Much more than these,ion test strips and molecule logic gates of the sensor G1 were fabricated and constructed,which acts as efficient and convenient detection of Fe³⁺in water solution and expands the application of chemosensor.4.A novel supramolecular polymer gel-based long-alkyl-chain-functionalized coumarin acylhydrazone for the sequential detection of toxic ionsIn this chapter,we design and synthesize a novel coumarin derivative G2 based on long alkyl-chained acylhydrazone.Interestingly,G2 can form a supramolecular polymer gel OGC?3%,n-BuOH/H₂O?with green and yellow AIE fluorescence via?-?stacking,van der Waals and intramolecular hydrogen bonding.And,after adding various anions(F^-,Cl^-,Br^-,I^-,H₂PO₄^-,AcO^-,ClO₄^-,HSO₄^-,SCN^-,N^3-,S^2-and CN^-)to polymer OGC,only CN^-and S^2-change the fluorescence of polymer OGC from greenish-yellow to blue,and the minimum detection limit of fluorescence are 1.64×10^-8M and 3.88×10^-8M.These values were lower than the levels of CN^-(1.6×10^-6M)and S^2-(1.5×10^-7 M)in drinking water as defined by the WHO.More importantly,polymers of OGC-CN and OGC-S formed after the addition of CN^-and S^2-to OGC can single successively identify Fe³⁺and Ag⁺in aqueous solution by fluorescence quenching.The minimum detection limit of fluorescence were 1.44×10^-8M and 2.53×10^-8M.Finally,thin film based on the supramolecular polymer gel OGC was prepared,which were confirmed to be convenient thin films for detecting CN^-and S^2-in water solution.And the thin films based on the supramolecular polymer gel OGC-CN and OGC-S were used to detect Fe³⁺and Ag⁺in water solution,respectively.