Sulfato‐β‐cyclodextrin induced multivalent supramolecular directional aggregation of cyanovinylene derivatives for achieving reversible near‐infrared fluorescence

Aggregate, Journal Year: 2024, Volume and Issue: unknown

Published: June 23, 2024

Abstract Molecular aggregation or supramolecular aggregation‐induced emission is one of the research hotspots in chemistry, biology, and materials. Herein, we report negatively charged sulfato‐β‐cyclodextrin (SCD) induced cyanovinylene derivatives (DPy‐6C) directional to form regular nanorods (DPy‐6C@SCD) through multivalent interactions, not only achieves ultraviolet‐visible absorption redshifted from 453 521 nm but also displays near‐infrared (NIR) with a large spectral redshift 135 nm. The DPy‐6C monomer presents random nanosheets weak fluorescence obtains aggregates after assembly SCD electrostatic interactions. In presence H + , DPy‐6C@SCD can further aggregate into elliptical without changes due protonation secondary amines. contrast, morphology becomes flexible sticks together upon addition OH − an blue shift 72 90‐fold intensity increase because disrupting stacking mode aggregates, thereby achieving acid‐base regulated reversible behaviors that cannot be realized by monomer. efficiently select detection volatile organic amines both liquid gas phases within 5 s at nanomolar level. Taking advantage RGB analysis calculation formula application, has been successfully used monitor various on smartphone, accompanied naked‐eye visible photoluminescence. Therefore, present provides efficient method which realizes topological transformation NIR luminescent molecular switch high sensitivity fluorescent sensing devices.

Language: Английский

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Molecular Engineering Accelerating Reverse Intersystem Crossing Endowed by Confining Donor to Ensure Low Efficiency Roll-Off OLEDs

ACS Materials Letters, Journal Year: 2025, Volume and Issue: unknown, P. 787 - 795

Published: Jan. 30, 2025

Language: Английский

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Fullerene-Functionalized Cellulosic Hydrogel Biosensor with Bacterial Turn-on Fluorescence Response Derived from Carboxymethyl Cellulose for Intelligent Food Packaging with DFT Calculations and Molecular Docking

Gels, Journal Year: 2025, Volume and Issue: 11(5), P. 329 - 329

Published: April 28, 2025

This study reports the synthesis and characterization of a novel carboxymethyl cellulose–N-fullerene–g-poly(co-acrylamido-2-methyl-1-propane sulfonic acid) (CMC–N-fullerene–AMPS) hydrogel for potential application in biosensing within food packaging. The was synthesized via free radical polymerization characterized using FTIR, SEM, fluorescence microscopy. FTIR analysis confirmed successful grafting AMPS incorporation N-fullerenes, indicated by characteristic peaks shift N–H/O–H stretching frequency. Density Functional Theory (DFT) calculations revealed that CMC–N-fullerene–AMPS exhibited higher stability lower band gap energy (0.0871 eV) compared to CMC–AMPS hydrogel, which means high reactivity CMC–N-fullerene–AMPS. N-fullerenes significantly enhanced hydrogel’s antibacterial activity, demonstrating 22 mm inhibition zone against E. coli 24 S. aureus, suggesting active packaging applications. Critically, displayed unique “turn-on” response presence bacteria, with distinct color changes observed upon interaction (orange-red) aureus (bright green). enhancement, coupled porous morphology SEM (pore size 377–931 µm), suggests this as sensing platform bacterial contamination These combined properties activity distinct, bacteria-induced signal make promising candidate developing intelligent materials capable detecting spoilage.

Language: Английский

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Recent breakthroughs in non-conjugated polymers for thermally activated delayed fluorescent OLEDs: emitters, hosts, and hole-transport materials

Materials Chemistry Frontiers, Journal Year: 2024, Volume and Issue: unknown

Published: Dec. 20, 2024

Non-conjugated linkers interrupt direct conjugation in the polymer backbone, providing enhanced solubility, blue TADF emitters, and high triplet energy host hole transport materials.

Language: Английский

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n-Type Doping Effect of Anthracene-Based Cationic Dyes in Organic Electronics

ACS Applied Materials & Interfaces, Journal Year: 2024, Volume and Issue: 16(33), P. 43774 - 43785

Published: Aug. 8, 2024

n-Type doping for improving the electrical characteristics and air stability of n-type organic semiconductors (OSCs) is important realizing advanced future electronics. Herein, we report a selection method an effective dopant with optimized structure thickness based on anthracene cationic dyes high miscibility induced by molecular similar to that OSCs. Among doped OSCs evaluated, rhodamine B (RhoB)-doped OSC exhibits highest density, smallest roughness 2.69 nm, phase deviation 0.85° according atomic force microscopy measurements, electron mobility (μ), showing its miscibility. Surface RhoB affords lowest contact resistance 2.01 × 10

Language: Английский

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Encapsulated TADF Macrocycles for High-Efficiency Solution-Processed and Flexible Organic Light-Emitting Diodes

Chemical Science, Journal Year: 2024, Volume and Issue: unknown

Published: Jan. 1, 2024

Macrocyclic thermally activated delayed fluorescence (TADF) emitters have been demonstrated to realize high efficiency OLEDs, but the design concept was still confined rigid π-conjugated structures. In this work, two macrocyclic TADF emitters, Cy-BNFu and CyEn-BNFu, with a flexible alkyl chain as linker bulky aromatic hydrocarbon wrapping units were designed synthesized. The detailed photophysical analysis demonstrates that significantly enhances solution-processibility flexibility of parent core without sacrificing radiative transition PLQY. Moreover, benefiting from sufficient encapsulation both horizontal vertical space, CyEn-BNFu further isolated inhibited aggregation caused quenching, which benefits utilization triplet excitons. As result, non-doped solution-processed OLEDs based on exhibit maximum external quantum efficiencies (EQE) up 32.3%, 3 times higher than those devices molecule. particular, these ensure fabrication brightness, color purity bending resistance. This work opens way construct highlights such encapsulated macrocycles for optimizing performance devices.

Language: Английский

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Thieno[3, 4‐b]thiadiazole Based Donor‐Acceptor Cyclic Oligomers: Ring Size‐Dependent Photophysical Properties and Efficient Near‐Infrared Electroluminescence Beyond 900 nm

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Sept. 6, 2024

Abstract Organic donor‐acceptor (D‐A) conjugated macrocycles, which are regarded as terminal‐less counterparts of linear π‐systems, have emerged a promising class material for organic optoelectronics. Nevertheless, circular symmetry generally makes the lowest electronic transition forbidden, is huge obstacle to developing bright near‐infrared macrocyclic dyes. Here, series cyclic D‐A oligomers (e.g., dimer ( [2]C 16 TT‐TPA ), trimer [3]C and tetramer [4]C )) synthesized in triphenylamine 4,6‐bisthienylthieno[3,4‐c]thiadiazole alternately coupled. The ring size‐dependent photophysical properties oligomers, such photoluminescence quantum yield radiative decay rate, revealed through both experiments theoretical calculations. Owing conformational flexibility dominant twisted conformation, shows increasing S 0 →S 1 thereby produces champion 6.35 % solution with emission beyond 900 nm, much higher than that acyclic oligomer (1.56%). Furthermore, ‐based light‐emitting diode achieves relatively high external efficiency 0.15% maximum radiance 2897 mW sr −1 m −2 . study not only provides insights into mechanism but also demonstrates potential D–A emitters.

Language: Английский

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Ambipolar Macrocycle Derived from Spiro-Xanthene and Carbazole: Synthesis, Structure-Property Relationships, Electronic Properties and Host-Guest Investigation

Chemical Communications, Journal Year: 2024, Volume and Issue: unknown

Published: Jan. 1, 2024

For the first time, we present detailed synthesis, photophysical, electrochemical, host-guest and charge transport properties of spiro[fluorene-9,9'-xanthene] (SFX) carbazole macrocycle SPS-NR-02. The electron hole values measured using space limited current (SCLC) method resulted in ambipolar with an to mobility ratio 0.39.

Language: Английский

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