化学
上部结构
手性(物理)
钙钛矿(结构)
自组装
结晶学
化学物理
纳米技术
有机化学
手征对称破缺
热力学
对称性破坏
量子力学
物理
Nambu–Jona Lasinio模型
材料科学
作者
Li Yao,Q. Q. Zhang,Mingsheng Li,Chao Chen,Honggang Gu,Shiyuan Liu,Guankui Long,Feng Liu,Wenlong Yang,Jiang Tang
摘要
Chiral hybrid organic–inorganic perovskites (CHOIPs) represent a distinctive class of chiral materials, exhibiting remarkable potential for facilitating chiral information transfer across multiple length scales. However, the currently reported CHOIPs predominantly rely on the molecular chirality arising from the interaction between chiral organic cations and inorganic backbones, leading to suboptimal chiral expression. Herein, we report the synthesis of a CHOIP superstructure film (R-MBA)x(S-MBA)(1–x)BiI4, which exhibited significantly enhanced chirality through a subtle enantiomeric excess (ee) approach. The implementation of a 20% ee in a mixture of two CHOIP enantiomers resulted in a substantial enhancement of the genuine circular dichroism (CD) asymmetry factor (gCD > 0.03), exhibiting an increase of more than 50-fold compared to that of the enantiopure film. X-ray diffraction (XRD) analysis revealed that the superstructure adopted an identical crystalline phase to that of the pure enantiomeric ones, suggesting that the observed enhancement does not originate from intracrystalline chirality. Integrating theoretical simulations, we posit that the observed chiral enhancement is predominantly attributed to crystal transfer from the nanoscale, defined as the superstructure chirality formed by mixed enantiomers. These findings establish a novel framework for exploring superstructure chirality in CHOIPs, offering new perspectives for future research in this field.
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