Synthesis And Characterization Of Conjugated Materials Based On Tetraphenyl Ethylene

In recent years,organic light-emitting materials have been rapidly developing and are widely used in the fields of OLEDs,fluorescent probes,and chemical sensors.The traditional organic fluorophores have to suffer from fluorescence quenching in solid state,which become a difficult problem for solid-state light-emitting materials.Since Tang's group firstly found aggregation-induced emission(AIE)effect in 2001,AIE materials exhibited the potential application in a lot of fields,because they are highly emissive in aggregation state,not considering fluorescence quenching.Among AIE-gens,tetraphenylethylene(TPE)derivatives have been widely explored due to ease synthesis and development of TPE molecules through effective modification of structures.In this work,we designed and synthesized a series of TPE-based conjugated polymers and dendrimers materials with AIE character.They were used as fluorescent sensors for detect explosive and their luminescent and conductive properties have been investigated at the same time.The specific research contents are as follows:Firstly,we synthesized and characterized AIE-active PFTPE and ACQ-actived PF,and their thermal stability,electrochemical and photophysical properties were investigated.Moreover,using the ultrasonic assisted method,the fluorescent sensors PU-PFTPE and PU-PF were prepared from polyurethane foams modified by PFTPE and PF,and the fluorescent sensors showed highly efficient detection for nitro explosive Picric Acid(PA)with different concentration.Under the same conditions,the sensitivity and response speed of PU-PF was superior to PU-PFTPE.The fluorescence could be quickly recovered while cleaning out the explosive of the used functional foams,and showed a good reusability.Secondly,we synthesized and characterized a series of dendrimers,Tr-2P-TPE,Tr-P-2TPE and Tr-3TPE,in which the carbon-nitrogen heterocyclic ring cyanuric chloride is considered as the core,tetraphenylethylene(TPE)and pterostilbene as dendrons,and by linkage of an oxygen atom between the core and dendrons.These dendrimers showed AIE behaviors.With increasing of TPE unit,they gave fluorescence enhancement.Thirdly,we synthesized and characterized PTPE-T and PTPE-2T with TPE and thiophene units,and their thermal stability,electrochemical and photophysical properties were investigated.PTPE-T and PTPE-2T showed good thermal stability.PTPE-T had AEE character,but PTPE-2T gave ACQ character with increasing of thiophene unit.Moreover,we also investigated the change of their conductive properties with doping of iodine.