分子间力
超分子化学
发光
联轴节(管道)
材料科学
圆极化
光化学
化学物理
化学
结晶学
光电子学
物理
晶体结构
光学
分子
有机化学
微带线
冶金
作者
Zheng‐Fei Liu,Xinxin Liu,Han Zhang,Lan Zeng,Li‐Ya Niu,Peng‐Zhong Chen,Wei-Hai Fang,Xiaojun Peng,Ganglong Cui,Qing‐Zheng Yang
标识
DOI:10.1002/anie.202407135
摘要
Abstract Herein we report on circularly polarized luminescence (CPL) emission originating from supramolecular chirality of organic microcrystals with a | g lum | value up to 0.11. The microcrystals were prepared from highly emissive difluoroboron β‐diketonate (BF 2 dbk) dyes R ‐ 1 or S ‐ 1 with chiral binaphthol (BINOL) skeletons. R ‐ 1 and S ‐ 1 exhibit undetectable CPL signals in solution but manifest intense CPL emission in their chiral microcrystals. The chiral superstructures induced by BINOL skeletons were confirmed by single‐crystal XRD analysis. Spectral analysis and theoretical calculations indicate that intermolecular electronic coupling, mediated by the asymmetric stacking in the chiral superstructures, effectively alters excited‐state electronic structures and facilitates electron transitions perpendicular to BF 2 bdk planes. The coupling increases cos θ μ , m from 0.05 (monomer) to 0.86 (tetramer) and triggers intense optical activity of BF 2 bdk. The results demonstrate that optical activity of chromophores within assemblies can be regulated by both orientation and extent of intermolecular electronic couplings.
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