2，7－9，9－二辛基芴－4，6－2，1，3－苯并噻二唑共聚物的合成及其光电性能研究

摘要

Poly(2,7-9,9-dioctyl-fluorene-co-4,6-2,1,3-benzothiadiazole)(46BTF8)was synthesized by Suzuki condensation polymerization,and its structure was characterized with 1 H NMR.The photoelectric properties of the polymer were researched by UV-vis spectra,photoluminescence spectra and cyclic voltam-metry.The results showed that compared with its structural analogues poly(2,7-9,9-dioctyl-fluorene-co-4, 7-2,1,3-benzo-thiadiazole)(F8BT),the maximum UV absorption and photoluminescenece wavelengths of 46BTF8 in the film state shifted to blue about 82 nm and 43 nm,respectively.The electrochemical redox behavior of the polymer suggested that this polymer material had excellent electrochemical stability and re-versibility,the electrochemical redox curve was similar while the electrochemical bandwidth increased by 0.2 eV and optical bandwidth increased by 0.36 eV.Those implied that the optoelectrical properties of the polymer could be tuned effectively by changing the linking position of benzothiadiazole unit while keeping their excellent electrochemical stability and reversibility.%采用 Suzuki 缩合聚合反应，制备了2，7－9，9－二辛基芴－4，6－2，1，3－苯并噻二唑共聚物（46BTF8），利用1 H NMR 对其结构进行表征，并通过紫外吸收光谱、光致发光光谱和循环伏安法对其光电性能进行研究．结果表明：与结构类似物2，7－9，9－二辛基芴－4，7－2，1，3－苯并噻二唑共聚物（F8BT）相比，46BTF8薄膜状态时的最大紫外吸收波长和光致发光波长均发生了明显的蓝移（分别蓝移了82 nm 和43 nm）；电化学氧化还原行为表明该聚合物材料具有优异的电化学稳定性和可逆性；电化学氧化还原曲线的形状变化不大，但其电化学带宽和光学带宽均发生了明显的变化，其中电化学带宽升高了0．2 eV，光学带宽升高了0．36 eV．这说明改变聚合物中苯并噻二唑单元的连接位置，可以在保持该类聚合物材料优异的电化学稳定性和可逆性的基础上，有效地调节聚合物材料的光电性能．