Supramolecular Functional Materials Based On Acylhydrazone/Schiff Base And Their Applications In Adsorption And Removal Of Pollutant

Recently,acylhydrazone/schiff base is windy concerned by more and more researchers because of their special properties of manageable reaction conditions,higher yield,great coordination ability,and so on.The supramolecular gel materials constructed by acylhydrazone/schiff base have attracted more attention due to their properties of excellent fluorescence,stimuli-responsive,and so on.In addition,anions/cations and molecules play an important role in biological and environmental systems.The excess of some heavy metals and harmful ions?molecules?will cause certain damage to biological and environmental systems,making their detection and removal much more important.Therefore,the design and application of acylhydrazone/schiff base chemical sensor?sensing for specific ions molecules?has become one hot spot in the related field.This thesis is divided into four parts for the describe of preparation and properties of acylhydrazone/schiff base supramolecular functional materials.1.We mainly introduced the characteristics of acylhydrazone/schiff base derivatives and their research progress in gel materials and sensors.And the applications of acylhydrazone/schiff base gel materials in fluorescence,stimuli-responsive,self-healing and pollutant removal were summarized in this chapter.The application of acylhydrazone/schiff base in the sensing field,including anion and cation sensors,molecular sensors and AIE sensors,are highlighted.Based on the above research background,we put forward our research topic.2.We designed and synthesized a kind of acylhydrazone functionalized bis-pillar[5]arene?DP5?,at the same time,we synthesized pyridine functionalized benzotriamide?SZ?.Through the host-guest interactions between DP5 and SZ,we successfully prepared a 3D network supramolecular gel DP5G,which showed strong aggregation induced emission?AIE?propties in DMSO and H₂O mixtures.In addition,the supramolecular polymer gel can effectively adsorb and remove cationic dyes?CV and RhB?in aqueous solution with a removal rate of up to 95%.This study not only provides the possibility for the construction of 3D network supermolecular polymer materials,but also has a good application prospect in dye pollutant removal.3.We synthesized a kind of functional tripod of?-hydroxynaphthalene?NSZ?by condensation reaction of?-hydroxynaphthalene formaldehyde and homobenzoylhydrazide.It was found that NSZ showed almost no fluorescence in DMSO solution.While NSZ molecules showed strong yellow green aggregation induced fluorescence in DMSO and H₂O mixed solution?DMSO/H₂O=3:7?because the intermolecular hydrogen bond between NSZ and H₂O restricted the intramolecular rotation?RIR?of N-N bond.It is more important that the compound NSZ can be used as a chemical sensor.The two channels of colorimetry and fluorescence can be used to detect CN^–in aqueous solution selectively and sensitively.4.We used 4-hydroxy-3-methoxybenzaldehyde and 3,3'-dimethylbenzidine to design and synthesize a fluorescence sensor?T?based on di-schiff base,which can identify Fe³⁺and CN^–.It is more important that T can selectively detect Fe³⁺,and the detection of Fe³⁺has reached a super sensitive level.A new type of complex,which is obtained by the coordination of T and Fe³⁺,has been used for the selective detection of CN^–ions.Moreover,we have successfully constructed an"on-off-on"fluorescent cycle switch and the IMPLICATION logic gate.In addition,we also prepared T-loaded detection films,which can be used as fluorescent display materials for the detection of Fe³⁺and CN^–.In conclusion,the successful construction of the above fluorescent sensor can provide some experience for the construction of intelligent materials for ion recognition.