Tunable and Responsive Circularly Polarized Luminescence of Self‐Organized Cellulose Nanocrystal Chiral Superstructures Loaded with AIE Luminogen

Advanced Functional Materials, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 9, 2025

Abstract Circularly polarized luminescence (CPL) holds great potential for next‐generation display techniques. However, dynamic, multicolor CPL with high luminescent quantum yield (PLQY) and tunable dissymmetry factor ( g lum ) based on cost‐effective, sustainable materials is scarcely attainable. Herein, a straightforward approach proposed engineering cellulose nanocrystal (CNC) chiral superstructures loaded aggregation‐induced emission luminogens (AIEgens) through the evaporation‐induced self‐assembly of renewable CNCs tetra‐(4‐pyridylphenyl)ethylene molecules. The judicious design two building blocks as donor–acceptor pairs not only respectively achieves an 86‐fold 2.1‐fold improvement in PLQY resulting systems suspension aggregate states comparison bare AIEgens, but also endows AIEgen‐loaded CNC pH‐tunable, humidity‐responsive, maximal | 0.89. It revealed that induction photonic bandgap effects—which are dominated by interactions homogeneous or heterogeneous processes—are involved mechanisms. Finally, humidity‐responsive multiple changes (structural color, fluorescent CPL) realized both biobased inks films, which paramount importance applications dynamic information encryption. This work offers underlying insights construction dynamically CPL.

Language: Английский

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Thermochromic Circularly Polarized Luminescence via Chiral AIEgen‐Loaded Microcapsules for Adaptive Camouflage and Security

Advanced Optical Materials, Journal Year: 2025, Volume and Issue: unknown

Published: March 17, 2025

Abstract Stimuli‐responsive circularly polarized luminescence (CPL) materials show great promise for dynamic camouflage, information encryption, and smart sensing. However, synthesis complexity limited practical versatility hinder current research. This study demonstrates novel thermochromic CPL microcapsules that contain chiral aggregation‐induced emission luminogens (AIEgens) doped alkane phase change (PCMs). The synthesized AIEgens, characterized by a high photoluminescence quantum yield of 73.3% obvious chiroptical properties, are successfully incorporated into PCMs to form materials. Microencapsulation the AIEgen‐doped effectively addresses concerns leakage corrosion, yielding stable thermally reliable microcapsules. These exhibit across diverse polymeric matrices substrate surfaces, highlighting their adaptability. Leveraging 2 3D encryption systems based on microcapsule‐embedded coatings developed, ensuring high‐level data security. Furthermore, application in automotive camouflage personalized decoration adapts car environmental terrains, improving aesthetics versatility. easy scalable fabrication multifunctionality these hold transformative potential security offering innovative solutions protecting sensitive enhancing vehicle aesthetics.

Language: Английский

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Circularly polarized luminescence with high dissymmetry factors for achiral organic molecules in solutions

Nature Communications, Journal Year: 2025, Volume and Issue: 16(1)

Published: March 26, 2025

Circularly polarized luminescence (CPL) in solution offers several advantages. However, it remains challenging for organic molecules to achieve circularly with high dissymmetry factor (glum) solution. Herein, a general strategy is developed by placing chiral nematic liquid crystals (N*-LCs) behind the of achiral molecules. The selective reflection-transmission mechanism solution-N*-LC composite system enables generation full-color and white light |glum| even reaching 2.0. This demonstrates versatility, being applicable both aqueous solutions, effectively achieving multiple glum values. Additionally, CPL switching logic gate applications are successfully realized leveraging N*-LCs reversible acid-base responsiveness systems. work provides robust values solutions. advantages, however, factors Here, authors report using

Language: Английский

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Enantioselective Induction of Helical Chirality in Coil‐Structured Amino Acid‐Based Polymers by Conjugated Molecules

Macromolecular Chemistry and Physics, Journal Year: 2025, Volume and Issue: unknown

Published: March 29, 2025

Abstract Chirality induction in aprotic polar solvents is challenging due to disrupted intermolecular interactions and the high conformational flexibility of random‐coil polymers. Herein, a scalable strategy using chiral BINOL as sole source induce helical chirality polymers presented. Circular dichroism (CD), ultraviolet‐visible (UV– vis), resonance Raman spectroscopy confirm that effectively induces cis‐transoidal conformations through hydrogen bonding π–π stacking interactions. CD circularly polarized luminescence (CPL) measurements reveal efficient transfer amplification, with mirror‐image CPL signals observed at 390 nm. Resonance spectra demonstrate enhanced structural order reduced irregularities, evidenced by blue shift narrowed C═C peak, while achiral exhibits minimal ability. This study highlights mechanisms excitation solvents, providing versatile pathway for designing advanced materials exceptional optical fluorescence properties.

Language: Английский

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Co-Assembly-Driven Chiral Induction of Well-Defined Polyfluorene-block-Poly(phenyl isocyanide) and Its Enhanced Circularly Polarized Luminescence Performance

ACS Applied Materials & Interfaces, Journal Year: 2025, Volume and Issue: unknown

Published: April 24, 2025

Chiral induction of polyfluorene (PF)-containing block copolymers plays a crucial role in the development advanced functional materials; however, research this area remains scarce. In contribution, PFO-b-PPI diblock comprising blocks poly(9,9-dioctylfluorene) (PFO) and poly(phenyl isocyanide) (PPI) were readily synthesized one pot by combining chain-growth Suzuki cross-coupling polymerization modified 9,9-dioctylfluorene monomer with Pd(II)-catalyzed phenyl isocyanide bearing pentafluorophenyl ester substitute. The obtained possessed controlled molar mass (Mn) narrow dispersity (Mw/Mn, Đ). Meanwhile, optically active supramolecular assemblies could be formed via coassembly chiral binaphthyl-based inducer film state after thermal annealing treatment, chirality was influenced temperature weight ratio copolymer to inducer, thickness film. Further investigations revealed that exhibited morphology single-handed helical nanofibers, sense nanofibers depended on configuration inducer. Moreover, excellent circularly polarized luminescence (CPL) performance glum as high 0.11.

Language: Английский

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Engineering Chirality of Transition Metal‐Based Nanomaterials for Enhanced Electrocatalysis

Advanced Functional Materials, Journal Year: 2025, Volume and Issue: unknown

Published: May 19, 2025

Abstract Transition metal‐based chiral nanomaterials have emerged as a highly promising class of electrocatalysts, uniquely combining the intrinsic electrocatalytic activity transition metals with properties that arise specifically from chirality. In particular, chirality‐induced spin selectivity (CISS) effect, which modulates electron polarization, has provided powerful approach to controlling reaction pathways and enhancing catalytic performance. Substantial advances are achieved in both synthesis application these nanomaterials, leading improvements variety reactions. Nevertheless, deeper understanding formation mechanisms diverse structures mechanistic relationship between configurations improved performance is still needed. This review systematically examines synthetic strategies for constructing different structural features. An in‐depth discussion CISS effect its role wide range reactions then provided. Finally, current challenges assessed, offer perspectives on future research directions such leveraging machine learning‐assisted design advanced situ spectroscopy accelerate development chiral‐enabled, spin‐selective systems.

Language: Английский

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Nanoaggregation‐Enhanced and Inverted Circularly Polarized Luminescence in Isomeric Schiff Base Bis(boron difluoride) Complexes

Chemistry - An Asian Journal, Journal Year: 2025, Volume and Issue: unknown

Published: May 20, 2025

Abstract To elucidate the emergence and amplification of circularly polarized luminescence (CPL) in chiral molecules their assemblies, we designed positionally isomeric V‐shaped Schiff base ligands corresponding bis(boron difluoride) complexes. The were synthesized by condensing cyclohexanediamine with either 1‐hydroxy‐2‐naphthaldehyde or 2‐hydroxy‐1‐naphthaldehyde, followed complexation boron difluoride (BF 2 ) to yield CNB1 CNB2, respectively. While parent bases exhibited no CPL, BF coordination induced strong CPL signals solution. Remarkably, upon aggregation a mixed solvent system, CNB2 displayed enhanced inverted whereas its isomer showed attenuated emission. Through comprehensive characterization singlecrystal analysis, attribute this divergent behavior distinct molecular packing modes: forms tightly stacked aggregates efficient π─π interactions, while adopts less ordered arrangement. This study establishes clear correlation between subtle structural modifications, supramolecular packing, performance, offering rational strategy for tailoring chiroptical properties through precise design controlled self‐assembly.

Language: Английский

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