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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Light-Controlled Macrocyclic Supramolecular Assemblies and Luminescent Behaviors

Accounts of Materials Research, Journal Year: 2024, Volume and Issue: 5(9), P. 1109 - 1120

Published: Aug. 1, 2024

ConspectusIntelligent supramolecular assemblies can respond well to external stimuli such as pH, temperature, light, electricity, magnetism, and enzymes achieve not only reversible topological morphology changes assembly/disassembly processes but also special physical chemical properties, which are successfully applied biological imaging, cancer treatment, luminescent materials, anticounterfeiting, sensing, molecular switch in chemical, research fields. Among all stimuli-responsive assemblies, light-controlled have always attracted intense attention because light is a kind of clean eco-friendly energy. In this Account, we focus on formed by four types photoresponsive molecules macrocyclic hosts cucurbit[n]urils, cyclodextrins, crown ethers, their regulations materials bioimaging. The cascade between photoisomerization or photoreaction mainly include: 1) based macrocycles diarylethene. As switches, the open-ring closed-ring configurations diarylethenes be reversibly controlled tunable fluorescence resonance energy transfer (FRET) process further regulate behaviors construct intelligent response cell-imaging, multicolor luminescence systems. 2) Light-controlled spiropyran. Different from diarylethenes, spiropyran converse positive charges ring-open merocyanie (MC) state, amphiphilic easy bond with like neutral/negative ring-closed (SP) more likely self-assemble. Therefore, differentiation bonding affinities MC SP light-driven machines. 3) azobenzene, whether azobenzene modified functional guests, through host–guest interactions, behavior regulated apply catalytic activity modulation, induction microtubule (MT) assembly/disassembly, drug delivery, others. 4) anthracene, different anthracene before after photooxidation hosts, dimerization, change morphologies drive phosphorescence dual imaging construction photostimuli-driven lanthanide switch. With creation novel building units modifications molecules, consider that innovation growth should widely used material conversion, real-time cell targeted organic optoelectronic machines, photocatalysis reactions.

Language: Английский

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Two Calix[3]Phenothiazine‐Based Amorphous Pure Organic Room‐Temperature Phosphorescent Supramolecules Mediated by Guest

Advanced Optical Materials, Journal Year: 2023, Volume and Issue: 11(10)

Published: March 22, 2023

Abstract Herein, two kinds of amorphous solid‐state supramolecular systems with purely organic room temperature phosphorescence (RTP) from calix[3]phenothiazine ( C[3]Pz ) activated by 1,2‐/1,3‐dicyanobenzene 1,2‐/1,3‐DCB are reported. Different macrocycle‐confined guest emission, RTP these is entirely the rivets cavity to form dense complex through CH … π interactions, leading different emissions at 566/524 nm under 430 excitation, respectively. Although shows a regular arrangement in crystal, vibration dissipation benzene ring results emitting only fluorescence 508 temperature. 1,2‐DCB and 1,3‐DCB can act as molecular fix inhibit so reduce nonradiative relaxation, which enables achieve effective emission 20.8–36.8% quantum yields. This kind guest‐activated host RTP, fairly rare systems, successfully used for color QR codes information encryption.

Language: Английский

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Photoactivated organic phosphorescence by stereo-hindrance engineering for mimicking synaptic plasticity

Light Science & Applications, Journal Year: 2023, Volume and Issue: 12(1)

Published: April 10, 2023

Purely organic phosphorescent materials with dynamically tunable optical properties and persistent luminescent characteristics enable more novel applications in intelligent optoelectronics. Herein, we reported a concise universal strategy to achieve photoactivated ultralong phosphorescence at room temperature through stereo-hindrance engineering. Such behavior was ascribed the suppression of non-radiative transitions improvement spin-orbit coupling (SOC) as variation distorted molecular conformation by synergistic effect electrostatic repulsion steric hindrance. This "trainable" first proposed mimic biological synaptic plasticity, especially for unique experience-dependent manipulation pulse intensity numbers. study not only outlines principle design newly dynamic materials, but also broadens their utility sensors robotics.

Language: Английский

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Multi‐stimulus Room Temperature Phosphorescent Polymers Sensitive to Light and Acid cyclically with Energy Transfer

Angewandte Chemie, Journal Year: 2023, Volume and Issue: 135(44)

Published: Aug. 19, 2023

Abstract The stimulus‐responsive room temperature phosphorescent (RTP) materials have endowed wide potential applications. In this work, by introducing naphthalene and spiropyran (SP) into polyacrylamide as the energy donor acceptor respectively, a new kind of brilliant dynamic color‐tunable amorphous copolymers were prepared with good stability processibility, afterglow emissions from green to orange in response stimulus photo or acid, thanks multi‐responsibility SP transfer between SP. addition deeply exploring inherent mechanism, these been successfully applied dynamically controllable applications information protection delivery.

Language: Английский

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