烷基链长对四苯基乙烯衍生物聚集行为和光学性质的影响

发布时间：2018-10-29 17:16

【摘要】：制备了带有不同烷基链长的四苯基乙烯衍生物1,1,2,2-四(4-正己氧基苯基)乙烯(THPE)和1,1,2,2-四(4-正癸氧基苯基)乙烯(TDPE),并采用紫外吸收光谱、荧光光谱研究THPE和TDPE在四氢呋喃(THF)/H_2O混合溶剂中的光物理性质,通过扫描电镜观察THPE和TDPE在THF/H_2O中形成的聚集体的形态结构。结果表明,THPE和TDPE在THF/H_2O中的紫外吸收光谱都出现拖尾现象,然而开始出现拖尾时溶剂中的水含量不同,THPE和TDPE分别在水含量为50%和40%的THF/H_2O中开始出现拖尾现象;THPE和TDPE都具有聚集诱导发光(AIE)性能,它们的荧光量子产率随着水含量的增加而增大,但是荧光量子产率快速增长的起始点不同,THPE和TDPE的荧光量子产率分别在水含量达到40%和30%后开始快速增长;THPE和TDPE在THF/H_2O中都能形成形状规则的聚集体,不同的是THPE在水含量为70%时才形成有序的纳米棒,而TDPE则在水含量为50%时即能形成纳米棒和微米片。这表明,带有长烷基链的TDPE更容易聚集,通过调节烷基链长度,有望制备出发光效率高、聚集体结构可控的AIE材料。
[Abstract]:Tetraphenyl ethylene derivatives with different alkyl chain lengths were prepared and characterized by UV absorption spectra. The derivatives of tetraphenyl ethylene 1 (1-hexoxy phenyl) 2-tetra (4-hexoxy phenyl) ethylene (THPE) and tetraphenyl (4-n-decoxy phenyl) ethylene (TDPE), with different alkyl chain lengths were prepared. The photophysical properties of THPE and TDPE in tetrahydrofuran (THF) / H _ 2O mixed solvent were studied by fluorescence spectroscopy. The morphological structures of the aggregates formed in THF/H_2O by THPE and TDPE were observed by SEM. The results showed that the UV absorption spectra of THPE and TDPE in THF/H_2O both showed tail trailing phenomenon, but the water content in the solvent was different when the tail was started to appear. THPE and TDPE began to appear trailing phenomenon in THF/H_2O with water content of 50% and 40%, respectively. Both THPE and TDPE have the properties of agglomeration induced luminescent (AIE). Their fluorescence quantum yields increase with the increase of water content, but the starting point of the rapid growth of fluorescence quantum yields is different. The fluorescence quantum yields of THPE and TDPE began to increase rapidly after the water content reached 40% and 30%, respectively. THPE and TDPE can form regular aggregates in THF/H_2O. The difference is that THPE can form ordered nanorods only when the water content is 70 and TDPE can form nanorods and microns when the water content is 50. This indicates that TDPE with long alkyl chain is easier to aggregate, and by adjusting the length of alkyl chain, it is expected to produce AIE materials with high luminescence efficiency and controllable aggregate structure.
【作者单位】：西安科技大学材料科学与工程学院;
【基金】：国家杰出青年科学基金(2120472) 陕西省自然科学基础研究计划(2016JQ5078)
【分类号】：O625.12

【相似文献】