nonemissive or weekly fluorescent when dissolved in their good solvents but become highly emissive when aggregated in their poor solvents or fabricated into thin solid films, showing unusual phenomena of aggregation-induced (AIE) and -enhanced emissions (AEE). Restriction of intramolecular rotations in the aggregate state is rationalized to be the main cause for the AIE and AEE effects. Photoluminescence (PL)
在这项工作中,首次合成了超支化的聚(2,5-silole)s [ hb -P 1(m),m = 1,6]。通过TaBr 5聚合1,1,1-二烷基-2,5-双(4-
乙炔基苯基)-3,4-二苯基甲
硅烷[ 1(m)] ,得到具有高分子量(M w up )的hb -P 1(m)最高可达2.5×10 5)(高达98%)。hb -P 1(m)的结构通过光谱学方法和hb -P 1的支化程度进行了表征。(6)被确定为0.55。超支化聚合物是可溶且稳定的,在环境条件下保存两年以上后,未观察到溶解度的变化。吸收和发射光谱HB -P 1(米)是红移从这些的1(米),这表明该聚合物是以上单体共轭。两个1(米)和HB -P 1(米)溶解在其良溶剂中时不发光或每周发荧光,但当聚集在其不良溶剂中或制成薄固体膜时变为高发射性,显示出异常的聚集诱导(AIE)和增强发射(AEE)现象。限制总体状态下分子内旋转的限制是引起AI