Inverted Chiroptical Properties of Hybrid Metal Halides Through Reversible Chiral Induction Driven by External and Internal Chirality Transfer

作者：Junjie Guan, Wenqing Han, Youpei Zhang, Jiuzhou Zhao, Shanshan Han, Yue Wang, Bona Fu, Hanwen Kang, Peihan Wang, Puxin Cheng, Yongshen Zheng, Jialiang Xu, Xian‐He Bu · 发表于：Angewandte Chemie International Edition · 年份：2025 · DOI：10.1002/anie.202503083 · 被引用次数：15 · 研究领域：Perovskite Materials and Applications、Terahertz technology and applications、Solid-state spectroscopy and crystallography

Abstract Chiral organic‐inorganic hybrid metal halides (OIHMHs) are commonly constructed by introducing pairs of enantiomorphic chiral precursors through a single chirality transfer pathway, which may limit the regulation of chiral structural diversity and chiroptoelectronic properties. Herein, we propose a new strategy for achieving reversible chiral induction of OIHMHs with inverted chiroptical properties through external and internal chirality transfer pathways, by utilizing a single chiral reagent R ‐/ S ‐ α ‐methylbenzylamine ( R ‐/ S ‐MBA). Specifically, R ‐MBA can externally induce chiral enrichment of M ‐DMA 4 (Bi 0.486 In 0.511 Sb 0.003 )Cl 7 ( M ‐DMA 4 (Bi‐In‐Sb)Cl 7 , DMA = dimethylammonium cation) without integrating into structure. Conversely, R ‐MBA can insert into structure, internally inducing the formation of DMA( R ‐MBA) 2 (Bi 0.634 In 0.362 Sb 0.004 )Cl 6 (DMA( R ‐MBA) 2 (Bi‐In‐Sb)Cl 6 ), which reverses the structural arrangements and inverts both linear and nonlinear chiroptical properties. Both externally and internally induced chiral OIHMHs exhibit significant chiroptical responses with high photoluminescence quantum yield (PLQY) and second harmonic generation (SHG). Moreover, the externally induced centimeter‐sized rhombic single crystal enables morphology‐ and angle‐dependent inverted circularly polarized luminescence with a dissymmetry factor of ∼0.02, through single crystal anisotropy. The internal induction enhances SHG intensity by nine‐fold and in...