Symmetry-Breaking Directed Assembly in Achiral Point Groups for Circularly Polarized Room-Temperature Phosphorescence.

IF 26.8 1区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Advanced Materials Pub Date : 2025-08-11 DOI:10.1002/adma.202511316

Qihuan Li,Yizhou Song,Jiaqi He,Junsheng Zhang,Guo Zou,Yixiang Cheng

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Abstract

Very recently, considerable attention has been given to pure organic circularly polarized room-temperature phosphorescent (CP-RTP) materials due to their unique photophysical properties. However, the directed construction of optically active phosphorescent signals within achiral systems remains a formidable challenge. In this study, two achiral crystals, 2CN4S and 2F4S, belonging to the achiral point groups 2/m and 1 ¯ $\bar{1}$ , exhibit strong CP-RTP emission with high photoluminescence dissymmetry factors (glum) up to 5.5 × 10-2 (543 nm) and 4.3 × 10-2 (550 nm), respectively. This phenomenon is attributed to the intrinsic mirror-antiparallel molecular conformations induced by the targeted substitution of cyano/fluoro groups, which spontaneously assemble into symmetry-breaking helical superstructures through synergistic C─H···N hydrogen bonding and π-π interactions. This work not only establishes a novel approach for CP-RTP material design but also overcomes structural constraints in optically active materials within achiral point group systems.

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室温圆极化磷光的非手性点群对称性破缺定向组装。

近年来，纯有机圆极化室温磷光（CP-RTP）材料由于其独特的光物理性质而受到广泛关注。然而，在非手性系统中定向构建光活性磷光信号仍然是一个艰巨的挑战。在本研究中，两个非手性晶体2CN4S和2F4S分别属于非手性点群2/m和1¯$\bar{1}$，表现出强烈的CP-RTP发射，光致发光不对称因子（glum）分别高达5.5 × 10-2 （543 nm）和4.3 × 10-2 （550 nm）。这一现象归因于氰基/氟基的定向取代引起的内在镜像-反平行分子构象，这些构象通过协同的C─H···N氢键和π-π相互作用自发地组装成对称破坏的螺旋超结构。这项工作不仅为CP-RTP材料设计建立了一种新的方法，而且克服了非手性点群系统中光学活性材料的结构限制。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Advanced Materials 工程技术-材料科学：综合

CiteScore

43.00

自引率

4.10%

发文量

2182

审稿时长

2 months

期刊介绍： Advanced Materials, one of the world's most prestigious journals and the foundation of the Advanced portfolio, is the home of choice for best-in-class materials science for more than 30 years. Following this fast-growing and interdisciplinary field, we are considering and publishing the most important discoveries on any and all materials from materials scientists, chemists, physicists, engineers as well as health and life scientists and bringing you the latest results and trends in modern materials-related research every week.