dichroism (CD) signs and intensities of the polymers can be explained by the concepts of “chiral cooperation” and “chiral competition” between the optically active thiophene unit and optically inactive/active phenylene unit. These polymers formed aggregate structures with increasing MeOH content of CHCl3/MeOH mixed solvents, with accompanying decrease of the UV–vis absorptions and photoluminescence (PL)
通过Sonoghashira-Hagihara偶联聚合3-取代的
2,5-二溴噻吩1与1-取代的3,5-二
乙炔基苯2N,2R,2S衍生自甘
氨酸和d- /ʟ-丙
氨酸。聚(1 - 2S)显示出基于在405和366nm的负激子手性强烈Cotton效应。在另一方面,聚(1-2N)表现出类似的聚(的顿效应1 - 2S),但是更弱,和聚(1 - 2R)基于正激子手性表现出较弱的Cotton效应。聚合物的手性二级结构取决于侧链的手性配合和手性竞争。聚合物的圆二色性(CD)征兆和强度的趋势可以用旋光性
噻吩单元和旋光性/活性亚苯基单元之间的“手性合作”和“手性竞争”的概念来解释。这些聚合物形成的聚集体结构随着CHCl 3 / MeOH混合溶剂的MeOH含量的增加而增加,同时伴随着UV-vis吸收和光致发光(PL)强度的降低。