High circularly polarized luminescence based on hydrogen-bonding columnar mesophase of an AIE-active mesogen with stronger D-A structure

IF 5.2 2区化学 Q2 CHEMISTRY, PHYSICAL Journal of Molecular Liquids Pub Date : 2025-05-15 Epub Date: 2025-03-11 DOI:10.1016/j.molliq.2025.127323

Hongyu Guo , Yanling Huang , Liangbin Lin , Shibing Chen , Fafu Yang

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Abstract

A high luminescence asymmetry factor (g_lum) and an excellent luminescence quantum yield in aggregated state are crucial factors for evaluating the application potential of circularly polarized luminescence (CPL) materials, yet achieving both simultaneously remains challenging. In this work, two AIE-active fluorogens based on two conjugated cyano-distyrylbenzenes attaching one or two cholesterol moieties with amide groups as spacers (BiCDB-1Ch and BiCDB-2Ch) were designed and synthesized. Both BiCDB-1Ch and BiCDB-2Ch showed the excellent CPL properties in aggregated states based on their hydrogen-bonding columnar liquid crystalline self-assembly. The absolute fluorescence quantum yield of BiCDB-1Ch with stronger D-A structure was 0.43 and the g_lum value was as high as 0.30, which was the highest one among the reported columnar CPL liquid crystals. The detailed liquid crystalline self-assembly behaviour and the mechanism of efficient chirality transfer and amplification were elucidated, providing a strategic approach for developing the novel liquid crystalline materials with superior CPL performance.

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一种具有较强D-A结构的aie活性介质的氢键柱状介相的高圆偏振发光

高的发光不对称系数（glum）和良好的聚集态发光量子产率是评价圆极化发光（CPL）材料应用潜力的关键因素，但同时实现这两者仍然具有挑战性。本研究设计并合成了两种具有aie活性的氟化合物（BiCDB-1Ch和BiCDB-2Ch），它们是基于两个共轭的氰基二苯基苯，以酰胺基为间隔基团连接一个或两个胆固醇基团。基于氢键柱状液晶自组装，BiCDB-1Ch和BiCDB-2Ch在聚集态表现出优异的CPL性能。具有较强D-A结构的BiCDB-1Ch的绝对荧光量子产率为0.43，glum值高达0.30，是已报道的柱状CPL液晶中最高的。详细阐述了液晶的自组装行为以及有效手性转移和放大的机理，为开发具有优异CPL性能的新型液晶材料提供了战略途径。

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来源期刊

Journal of Molecular Liquids 化学-物理：原子、分子和化学物理

CiteScore

10.30

自引率

16.70%

发文量

2597

审稿时长

78 days

期刊介绍： The journal includes papers in the following areas: – Simple organic liquids and mixtures – Ionic liquids – Surfactant solutions (including micelles and vesicles) and liquid interfaces – Colloidal solutions and nanoparticles – Thermotropic and lyotropic liquid crystals – Ferrofluids – Water, aqueous solutions and other hydrogen-bonded liquids – Lubricants, polymer solutions and melts – Molten metals and salts – Phase transitions and critical phenomena in liquids and confined fluids – Self assembly in complex liquids.– Biomolecules in solution The emphasis is on the molecular (or microscopic) understanding of particular liquids or liquid systems, especially concerning structure, dynamics and intermolecular forces. The experimental techniques used may include: – Conventional spectroscopy (mid-IR and far-IR, Raman, NMR, etc.) – Non-linear optics and time resolved spectroscopy (psec, fsec, asec, ISRS, etc.) – Light scattering (Rayleigh, Brillouin, PCS, etc.) – Dielectric relaxation – X-ray and neutron scattering and diffraction. Experimental studies, computer simulations (MD or MC) and analytical theory will be considered for publication; papers just reporting experimental results that do not contribute to the understanding of the fundamentals of molecular and ionic liquids will not be accepted. Only papers of a non-routine nature and advancing the field will be considered for publication.