硝基苯化合物对聚对苯撑乙炔基咔唑荧光淬灭性能研究  

Fluorescence Quenching Properties of Nitrobenzene Derivative to Poly(Polyphenylene Ethynylene Carbazyl)

作　　者：支俊格[1] 申进波[2] 徐秀玲[1] 佟斌[2] 张博[1] 董宇平[2] 

机构地区：[1]北京理工大学理学院,北京100081 [2]北京理工大学材料科学与工程学院,北京100081

出　　处：《北京理工大学学报》2008年第7期631-634,共4页Transactions of Beijing Institute of Technology

基　　金：国家自然科学基金资助项目(20504005)

摘　　要：以2,5-二甲氧基对苯二乙炔和3,6-二碘-9-戊基咔唑为单体,采用Sonogashira偶合反应合成了含有咔唑基团的聚对苯撑乙炔基咔唑(P).硝基苯衍生物对该聚合物的荧光淬灭实验结果表明,当对位取代基团不同时,取代基的推电子能力越强对聚合物P的淬灭效率越高;对相同取代基的淬灭剂而言,邻、对位取代时的淬灭效率明显高于间位取代化合物.淬灭剂是与P通过形成电荷转移络合物而使处于激发态的P分子链发生能量转移的,淬灭剂对P荧光的淬灭效率随其浓度的增大而非线性升高.Poly （2,5-dipentyloxyphenylene ethynylene carbazyl） （P） was synthesized with 2,5- dimethoxy-1,4-diethynylbenzene and 3, 6-diiodo-9-pentylcarbazole by Pd-catalyzed Sonogashira coupling reaction. The fluorescence quenched properties of P was influenced obviously by the structure and relative position of the substituting groups of nitrobenzene derivates. For the para- substituting nitrobenzene, the fluorescence quenching efficiency of quenchers increased with the increase of electron repulsion capability of the para-substituting group. And the fluorescence quenching efficiency reduced according to the sequence of o-NA, p-NA and m-NA under the same conditions due to the different electron withdrawing conjugated effect and inductive effect between amino- and nitro- group in nitroaniline isomers. Further study exhibits that the fluorescence quenching efficiency increases nonlinearly with the concentration of the quenchers.

关 键 词：咔唑 共轭聚合物 荧光淬灭 硝基芳香化合物 

分 类 号：O631.2[理学—高分子化学]