联苯基取代聚噻吩衍生物的合成及其发光性能研究

为了研究侧链芳香基团对聚噻吩衍生物发光性能的影响 ,采用偶联反应合成了反应单体 3-联苯基噻吩 ,然后在三氯化铁的氧化作用下聚合 ,得到了聚 (3-联苯基 )噻吩 (PBPTH) .通过红外光谱、紫外可见光谱以及核磁共振氢谱对材料的结构进行了表征 .在紫外光谱上 ,PBPTH的最大吸收峰位于 4 0 6nm处 ,比聚(3-辛基 )噻吩 (P3OT)的吸收峰蓝移了 34nm .在荧光光谱上 ,PBPTH的光致发光峰位于 5 36 8nm处 ,比P3OT的发光峰蓝移了 32nm .研究结果表明 :由于侧链联苯基的空间位阻作用 ,导致了聚合物共轭程度的降低 ,从而造成了吸收光谱和发光谱的蓝移 ;PBPTH的发光强度与P3OT相比有了明显的下降 ,说明联苯基生色团不足以补偿共轭程度降低对发光性能的影响

Study on Synthesis and Photoluminescence Performance of Biphenyl Substituted Polythiophene Derivatives

In order to investigate the effect of aromatic group in side-chain on the luminescence performance of polythiophene derivatives, a reactive monomer of 3-biphenylthiophene was prepared by coupling 3-(bromothiophene) with biphenyl bromide, then the monomer was polymerized by oxidation coupling polymerization of 3-biphenylthiophene using iron (III) chloride as catalyst in chloroform. The produced poly(3-biphenyl)thiophene(PBPTH) were characterized by infrared spectrum, UV-vis absorption spectrum and~1H NMR. The maximum peak in UV-vis spectrum of PBPTH is at 406nm, the blue-shifte is 34 nm comparing with that of poly(3-octyl)thiophene(P3OT, the maximum peak is about 440nm). Furthermore, the photoluminescence peak of PBPTH locates at 547 nm, the blue-shift is about 32 nm related to P3OT. (Research) results show that the blue-shifts in UV-vis spectrum and photoluminescence (PL) spectrum are formed by the steric hindrance of biphenyl group,which decreases the effective conjugating length of (PBPTH.) The PL intensity of PBPTH solution is decreased greatly related to P3OT, which imply that the biphenyl group cannot compensate enough for the loss of the effective conjugating length to the PL (performance.)