Tetraphenylethylene Based Fluorescence Chemosensor For Anions

Fluorescent chemosensor is a hot topic in supramolecular filed for its simplity,rapid detection,high sensitivity and good selectivity.Particully,tetraphenylethylene based chemosensor has been attracted much attention for its aggregation induced luminescence(AIE)property,easy synthesis and functionalization.TPE based derivatives have been widely used in chemical sensing,biological probe,cell imaging,OLEDs etc.In this thesis,a series of TPE-based chemosensors for recognition of anions are synthesized and characterized,and their anions sensing properties were investigated by fluorescence emission spectra,UV-vis absorption spectra,1H NMR titrations,TEM and SEM techniques.1.A novel tetraphenylethene-based probe bearing bis-imidazolium anion donors,BIM-TPE,has been reported for pyrophosphate anion recognition.This probe can self assemble finite small sphere nanoaggregates with very weak emission in aqueous solution,and changes into large rod-like nanoaggregates with strong aggregation-induced emission upon binding with pyrophosphate anion.For practical applications,this probe can be used as an enzyme activity assay,and detected PPi in actual water samples.2.A urea functionalized TPE-based organic gel,HGA-TPE,is design and synthesized.HGA-TPE can form stable gels in ethyl acetate,acetone and ethanol solvent.Interesting,this gel shows exclusive recognition ability toward fluoride anion,with the phase transition from gel to sol state.The gel formation and its F-recognition mechanisms were studied by XRD,SEM amd 1H NMR titration.3.A new fluorescent chemosensor,HOIM-TPE,bearing TPE fluorophore,and(CH)+/NH anion binding sites,was synthesized.recognition sites to construct,a detailed study of the organic phosphate recognition ability pure water phase.The results showed that HOIM-TPE was able to selectively detection of ATP,and its self-assembly and recognition process was studied by DLS and 1H NMR titration.