Inversion of Supramolecular Chirality in Bichromophoric Perylene Bisimides: Influence of Temperature and Ultrasound
Inversion of Supramolecular Chirality in Bichromophoric Perylene Bisimides: Influence of Temperature and Ultrasound
复制标题
DOI：
10.1021/la500497g
复制
发表时间：
2014-06-03
期刊：
影响因子：
3.9
通讯作者：
Kawai, Tsuyoshi
中科院分区：
文献类型：
--
作者：
Kumar, Jatish;Nakashima, Takuya;Kawai, Tsuyoshi
通过改变制备方法，可以控制两种苝酰亚胺双发色团体系自组装纳米结构的超分子螺旋度。利用吸收光谱、荧光光谱、圆二色谱、红外光谱、X射线衍射、透射电镜和扫描电镜等技术，对不同条件下的自组装进行了详细的研究。这些研究表明，加热冷却方法的结果与有序的分子堆积和增强的光学手性聚集体。超声波处理导致分子聚集体的有序堆积较少，其中超分子手性相对于通过加热冷却方法制备的样品是反向的。这种加热冷却方法被证明是上级在纤维合成方面，产生的纤维具有延长的长度和突出的螺旋扭曲。在较高浓度下，两种化合物在苯甲腈中均表现出凝胶化性质。这些超分子体系中的可调手性光学性质使它们成为基于有机纳米结构的光学和电子器件制造领域的潜在候选者。
The supramolecular helicity in the self-assembled nanostructures of two perylene bisimide bichromophoric systems could be controlled by varying the preparatory methods. The self-assembly of the compounds under different conditions was investigated in detail by using absorption, fluorescence, CD, FTIR, XRD, TEM, and SEM techniques. These studies reveal that the heating cooling method results in aggregates with ordered molecular packing and enhanced optical chirality. Ultrasonication leads to molecular aggregates with less ordered packing wherein the supramolecular chirality was reversed relative to the sample prepared via a heating cooling method. This heating cooling method proved to be superior in terms of nanofiber synthesis, yielding fibers with extended length and a prominent helical twist. At higher concentration, both compounds exhibited a gelation property in benzonitrile. The tunable chiroptical properties in these supramolecular systems make them potential candidates for applications in the field of optical and electronic device fabrication based on organic nanostructures.