含苯并硒二唑组分的聚对苯撑乙炔类共轭聚合物的合成及性能研究

Synthesis and characterization of benzoselenadiazole-containing poly(aryleneethynylene) derivatives

通过钯催化的Sonagashira偶合反应合成出了3种带有不同链长烷氧基侧链,主链中含有2,1,3-苯并硒二唑组分的聚苯乙炔类共轭聚合物并对其化学结构进行了表征确认。此类聚合物在常用的有机溶剂中具有较好的溶解性和成膜性。通过紫外可见光谱、荧光光谱、循环伏安等对所得聚合物的基本性能进行了探讨。聚合物P7、P9和P12在溶液状态下的紫外吸收分别为421、450和450nm,相对应最大发射分别位于475、482和481nm;固态下聚合物的吸收分别为433、486和486nm,相对应最大发射为575、583和590nm。聚合物的循环伏安测试表明聚合物P7、P9、P12的起始电位为1.19、1.19、1.18V。聚合物非线性光学性能研究表明取代基为十二碳烷氧基的聚合物显示出了良好的三阶非线性光学性能,其三阶非线性光学系数为3.54×10-12esu。

Poly（aryleneethynylene） derivatives containing 2,1,3-benzoselenadiazole group and bearing side chains of different lengths, PT, P9 and P12, have been synthesized by palladium-catalyzed Sonagashira reaction, and their chemical structure were characterized by 1H NMR, FT-IR and elemental analyses. All of these polymers showed good solubility in common organic solvents and good film-forming capability. The optical and electroehemical properties of them were investigated. The maximum absorbance of PT-P12 in solution appeared at 421, 450 and 450nm, and the corresponding emission was peaked at 475, 482 and 481nm, respectively. The maximum absorbance of P7-P12 in solid appeared at 433, 486 and 486nm, with the corresponding emission peaked at 575, 583 and 590nm, respectively. C-V investigation of these polymers showed that the onset voltage of oxidation processes of PT-P12 appeared at 1.19, 1.19 and 1.18V, respectively. The third-order non-linear optical behavior of typical polymer, P12 was also investigated here and the third-order nonlinear optical index of this polymer is 3.54×10^-12esu.