Spontaneous chiral self-assembly of CdSe@CdS nanorods
Spontaneous chiral self-assembly of CdSe@CdS nanorods
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CdSe@CdS 纳米棒的自发手性自组装
DOI：
10.1016/j.chempr.2021.06.009
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发表时间：
2021-10-14
期刊：
影响因子：
23.5
通讯作者：
Che, Shunai
中科院分区：
文献类型：
--
作者：
Duan, Tianwei;Ai, Jing;Che, Shunai
自发性手性对称性破缺(SCSB)中的对映体过量现象是自然界同色性起源的一个重要问题，而手性无机化合物长期以来一直被认为是外消旋体。在这里，我们报告了硫族镉纳米棒的自组装中的SCSB，导致手性偏向远离外消旋体。在非手性有机物存在的情况下，在{111}Cub/{0001}六角晶面的外延界面上随机形成了沿棒轴单向旋转晶格的螺旋状CdSe@CDS纳米棒(HCCNs)。螺旋位错结构的稳定性，加上对其结合能的理论分析，暗示了在非手性环境中出现螺旋结构的可能性。简单的溶剂挥发自组装形成的层次化手性膜在批次之间表现出自发的对映体过量，根据多数规则推测这种对映体过剩的种子组装导致了单手占优势的体系。
The enantiomeric excess phenomenon in spontaneous chiral symmetry breaking (SCSB) is a crucial issue in the origin of homochirality in nature, whereas chiral inorganic compounds have long been reckoned as racemates. Here, we report the SCSB in the self-assembly of cadmium chalcogenide nanorods, leading to chiral biases away from the racemate. In the presence of achiral organics, helical CdSe@CdS nanorods (HCCNs) with unidirectionally rotated crystal lattices along the rod axis were stochastically formed on the epitaxial interface of the {111}cub/{0001} hex planes. The stability of helical dislocation structures, as supported by a theoretical analysis of their binding energies, suggested the possibility of the emergence of helical structures in an achiral environment. Hierarchical chiral films induced by simple solvent evaporation self-assembly of HCCNs exhibited spontaneous enantiomeric excess between batches, which was speculated to be originated from the enantiomeric excess seed assembly that induce one-handedness dominated system based on the majority rules.