Synthesis And Aggregation-induced Emission Properties Of Triphenylamine Derivatives

In the paper,we synthesized three triphenylamine derivatives(TPAQs),where the triphenylamine serves as the central donor core,quinoline as the acceptor.And we characterized their structures by element analysis,IR,NMR and MS.The optical properties and aggregation-induced emission(AIE)properties of three compounds were studied using the UV-visible and fluorescence spectra.The results showed that AIE properties of compound enhanced with the increase of the branches.We could observe molecular conformation and packing manners by using single crystal X-ray diffraction.The repeated protonation and deprotonation process was studied,and both neutral and cation of STPAQ,also cation of TTPAQ exhibited tunable emission phenomena in suitable solvent.TPAQs emission can be reversibly switched by repeated protonation and deprotonation,indicates TPAQs can work as a fluorescent p H sensor in 10% water solution and a chemosensor for detecting volatile organic compounds with high acidity and basicity.We also synthesized six hydrazone compounds containing a carbonyl group.And their structures were characterized by element analysis,IR,NMR and MS.We investigated their aggregation-induced emission properties.The results showed that the position of substituents,the difference of electron absorption ability and the presence or absence of carbonyl groups had great influence on the AIE properties of the compounds.In addition,we also discussed the mechanochromism mechanism of the two compounds by solid fluorescence spectroscopy,WXRD and DSC.Finally,the SEM and fluorescence microscopy technique was used to display the nano-morphology.