Pramatha Sai Rachana, Srideep Dasari, Pattnaik Udaijit, Sahu Rahul, Suresh Devamrutha Ilayidathu, Yadav Aditya Chandrakant, Muduli Chinmayee, Reddy Sandeep K, Senanayak Satyaprasad P, Venkata Rao Kotagiri
Department of Chemistry, Indian Institute of Technology Hyderabad, Kandi, Sangareddy, Telangana, India.
Nanoelectronics and Device Physics Lab, School of Physical Sciences, National Institute of Science Education and Research (NISER), Bhubaneswar, OCC of HBNI, Jatni, Khurdha, Odisha, India.
Nat Commun. 2024 Dec 30;15(1):10808. doi: 10.1038/s41467-024-55107-y.
Secondary nucleation is an emerging approach for synthesizing higher-order supramolecular polymers with exciting topologies. However, a detailed understanding of growth processes and the synthesis of homochiral superstructures is yet to be demonstrated. Here, we report the non-covalent synthesis of dendritic homochiral superstructures using NIR triimide dyes as building blocks via a secondary nucleation elongation process. Detailed analysis of kinetics and temporal evolution of morphology indicates that the formation of dendritic homochiral superstructures proceeds via growth on the surface and growth from the surface of the seeds. The combination of these two processes leads to the formation of elegant homochiral superstructures with a size of ~0.4 mm, having a superhelix at the center and helical fibres as branches. Moreover, these dendritic homochiral superstructures exhibit significantly high chiro-optical photoresponse with the magnitude of g reaching a value as high as 0.55 - 0.6. Thus, our results provide insights into the growth process of homochiral superstructures with dendritic topology, which can be critically important for the design and optimization of chiral-selective optoelectronic devices leveraging controlled self-assembly.
二次成核是一种用于合成具有令人兴奋拓扑结构的高阶超分子聚合物的新兴方法。然而，对生长过程和同手性超结构的合成的详细理解仍有待证明。在此，我们报告了使用近红外三酰亚胺染料作为构建单元，通过二次成核伸长过程非共价合成树枝状同手性超结构。对动力学和形态随时间演变的详细分析表明，树枝状同手性超结构的形成通过在种子表面生长和从种子表面生长进行。这两个过程的结合导致形成尺寸约为0.4毫米的优雅同手性超结构，其中心有一个超螺旋，分支为螺旋纤维。此外，这些树枝状同手性超结构表现出显著高的手性光学光响应，g值高达0.55 - 0.6。因此，我们的结果为具有树枝状拓扑结构的同手性超结构的生长过程提供了见解，这对于利用可控自组装设计和优化手性选择性光电器件可能至关重要。
