Solvent-Induced Chiroptical Changes in Supramolecular Assemblies of an Optically Active, Regioregular Polythiophene
作者:Hidetoshi Goto、Yoshio Okamoto、Eiji Yashima
DOI:10.1021/ma012083p
日期:2002.6.1
addition of poor solvents such as methanol and acetone with similar Cotton effect patterns, while some poor solvents such as acetonitrile and nitromethane dramatically changed the Cotton effect patterns of poly-1a. The changes in the conformation, morphology, and the size of the poly-1a aggregates induced by different solvents were also investigated with 1H NMR titrations, X-ray diffraction, filtration experiments
具有手性恶唑啉残基,聚[3- 4-((R)-4-乙基-2-恶唑啉-2-基)苯基]旋光活性,区域规则(头尾)聚噻吩的溶剂诱导的手性}噻吩](聚1a)通过紫外可见光谱和CD光谱法研究了良溶剂,氯仿和各种不良溶剂的混合物。聚1A在加入不良溶剂,例如甲醇和丙酮与类似Cotton效应图案表现出氯仿诱导圆二色性(ICD),而一些不良溶剂如乙腈和硝基甲烷显着改变聚-棉效果图案1a中。poly- 1a的构象,形态和大小的变化还通过1 H NMR滴定,X射线衍射,使用膜滤器的过滤实验以及原子力显微镜(AFM)测量研究了由不同溶剂诱导的聚集体。基于这些结果,提出了手性超分子聚集体的可能模型。