具有聚集诱导发光效应的咔唑基三苯乙烯衍生物单体及聚合物

A MONOMER AND ITS POLYMER DERIVED FROM CARBAZOLYL TRIPHENYLETHYLENE WITH AGGREGATION-INDUCED EMISSION EFFECT CHARACTERISTICS

合成了一类新的咔唑基三苯乙烯衍生物单体及其聚合物.利用示差扫描量热法(DSC)、热重分析法(TGA)、紫外可见分光光度法和荧光分光光度法等对单体和聚合物的性能进行了初步的表征.实验结果表明,该单体和聚合物具有较高的玻璃化转变温度(Tg),分别为210℃和229℃;单体和聚合物均具有很高的热稳定性,热失重5%的温度分别为466℃和467℃;单体具有明显的聚集诱导发光性能(AIE),而聚合物则具有聚集诱导增强发光性能(AIEE);所合成的单体和聚合物有望在OLED器件以及化学传感器上得到应用.

A new monomer derived form carbazolyl triphenylethylene was synthesized through Wittig-Horner and Suzuki reactions with excellent yields, and its polymer was obtained by radical polymerization initiated with AIBN. Their thermal and photophysical properties were characterized by differential scanning calorimetry （DSC）, thermal gravimetric analysis （TGA）,ultra-violet （UV） spectra and photoluminescence （PL） spectra. The preliminary results show that：the monomer and polymer possess high glass transition temperatures （210℃ and 229 ℃ , respectively） and high thermal decomposition temperatures （466℃ and 467 ℃, respectively） ;in dichloromethane solution, the emission peak of the monomer locates on 455 nm, while the peak of the polymer red shifts to 466 nm;the polymer exhibits higher quantum yield （0.16） in dichloromethane solution than that of the monomer （0.017）;both the monomer and polymer emit very intense blue emission in solid form, while the monomer has the maximum emission wavelength at 472 nm and the polymer at 482 nm;the monomer exhibits obvious aggregation-induced emission （AIE） while adding water into it＇ s THF solution and on/off fluorescent switching which senses to organic vapor, and the polymer has aggregation-induced enhanced emission （AIEE） characteristics. The twist structures of the monomer are considered as the key structure for the AIE and AIEE phenomena of those carbazolyl triphenylethylene derivatives. It is suggested that they are potential materials for fabrication in OLED devices and fluorescence sensors.