New Molecular Photoswitch Based on the Conformational Transition of Phenothiazine Derivatives and Corresponding Triplet Emission Properties

Journal of the American Chemical Society, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 13, 2025

Molecular photoswitch research has drawn much attention in the last century owing to its great potential development of smart materials. However, photoswitches suitable for constructing light-responsive luminescent materials remain limited, especially those involving triplet-state phosphorescence. Herein, we designed a novel molecular based on conformation transition phenothiazine derivatives, minimizing steric hindrance (-CH

Language: Английский

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Supramolecular liquid crystals from the dimer of L‐shaped molecules with tertiary amide end groups

Aggregate, Journal Year: 2024, Volume and Issue: 5(3)

Published: Jan. 23, 2024

Abstract Supramolecular liquid crystals (SLCs) are attractive materials for fabricating devices with new optoelectronic functions. Conventional SLCs made from hydrogen‐bonded mesogens. However, these mesogens suffer high melting points, and the types of formable aggregates limited owing to directionality hydrogen bonding. Therefore, fabricate non‐hydrogen‐bonded SLCs, we hypothesized that introduction tertiary amide groups into calamitic molecules would be advantageous because they have an L‐shaped structure N ‐ or C ‐alkyl side chains not aligned along long axis flexibility undergo cis–trans isomerization. In this study, developed a novel SLC by assembling dimer composed (phenyltolanes) amides at their ends. These exhibited smectic B phase. The phase transition temperature crystal was low despite π‐conjugated core. Wide‐angle X‐ray diffraction variable‐temperature Fourier‐transform infrared measurements revealed formation weak intermolecular interactions, is, molecular recognition molecules, mobility alkyl attached driven isomerization in Thus, contributed enormously lower clearing points SLC. method can used only develop but also soft matter controlled properties incorporating as impart desired functionalities.

Language: Английский

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Purely organic room-temperature phosphorescence sensitizers for highly efficient hyperfluorescence OLEDs

Science Advances, Journal Year: 2025, Volume and Issue: 11(12)

Published: March 21, 2025

Multiresonance thermally activated delayed fluorescence (MR-TADF) emitters are promising candidates for organic light-emitting diodes (OLEDs) with high color quality. However, in most cases, noble metal–containing phosphors required as sensitizers MR-TADF to improve their electroluminescence (EL) performances, which may lead cost and environmental pollution. Herein, an efficient purely room-temperature phosphorescence (RTP) material, 3,2-PIC-TXT, fast radiation is developed. It not only exhibits impressive EL performances emitter outstanding external quantum efficiency (EQE) of 33.2%, higher than that Ir(ppy) 3 (25.2%), but also functions remarkably a sensitizer green (BN2, tCzphB-Ph, tCzphB-Fl). The hyperfluorescence OLEDs using 3,2-PIC-TXT provide ultrahigh EQEs 40.9 43.8%, superior those based on (37.0 38.0%), along superb purity excellent operational stability. These the best devices RTP materials reported so far.

Language: Английский

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基于吩噻嗪和多环芳烃的高效光诱导室温磷光材料: 可调发光颜色和热刺激响应

Science China Materials, Journal Year: 2024, Volume and Issue: 67(9), P. 2778 - 2788

Published: July 9, 2024

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Pd/NBE-Catalyzed One-Pot Modular Synthesis of Polycyclic Fused δ-Lactams and Investigation of Room-Temperature Phosphorescence

ACS Catalysis, Journal Year: 2024, Volume and Issue: 14(16), P. 12181 - 12191

Published: July 30, 2024

The advancement of sophisticated synthetic methodologies that streamline reaction processes while enhancing molecular complexity is a perpetual necessity in the realm chemistry. Catalytic one-pot cascade play crucial role efficient construction intricate molecules with exceptional chemoselectivity. Herein, we present approach for synthesis polycyclic fused δ-lactams via sequential phosgenation, Pd/NBE-catalyzed ortho-carbamoylation/ipso-Heck-type cyclization, and C–H activation from readily available aryl halides, amines, triphosgenes. This stands out as first example situ carbamoyl chloride formation amine precursors, presenting an alternative to existing transformations involving chlorides. practical significance these showcased by 81 rapid economically favorable manner, without need intermediate purification. Moreover, were scalable compatible various natural products pharmaceuticals, further underscoring effectiveness this strategy. relatively rigid coplanar structure displayed our synthesized exhibits distinct room-temperature phosphorescence characteristics, which have been utilized anticounterfeiting high-security-level data encryption.

Language: Английский

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Achieving dual-mode long-persistence afterglow through an aromatic furan organic host–guest system

Materials Chemistry Frontiers, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 1, 2025

Pure organic dual-mode long-persistence afterglow with high efficiency room-temperature phosphorescence (RTP) along thermally activated delayed fluorescence (TADF) is realized via an aromatic furan host–guest system.

Language: Английский

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How Intermolecular Interaction and Hydrostatic Pressure Affect the Organic Room Temperature Phosphorescence Properties: A QM/MM Study

Chinese Journal of Physics, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 1, 2025

Language: Английский

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Building a Highly Stable Red/Near Infrared Afterglow Library with Highly Branched Structures

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

Published: Jan. 26, 2025

Achieving organic red/near infrared (NIR) phosphorescence at high temperatures is theoretically challenging because of the severe nonradiative transitions excited triplet states with low energy gaps. This study realizes bright and persistent red/NIR afterglow excellent high-temperature resistance up to 413 K via highly efficient (≈100%) resonance transfer (PRET) from rationally designed branched luminogens as donors dyes acceptors, coupled optimized aggregated structures. According systematic investigations, abundant internal cavities formed by in solid ensure dye loading space limitation, which can considerably suppress temperatures, promoting a stability. Moreover, 16 types host-guest systems varied topological structures different various sizes confirm universality strategy. provides an approach achieve stable afterglow.

Language: Английский

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Constructing low-dimensional phosphorescent MOFs by site-selective coordination engineering

Journal of Molecular Structure, Journal Year: 2025, Volume and Issue: unknown, P. 141861 - 141861

Published: Feb. 1, 2025

Language: Английский

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Harnessing Photocycloreversion for Dimer Construction and Photoactivation: From Molecule to Aggregate

Aggregate, Journal Year: 2025, Volume and Issue: unknown

Published: March 12, 2025

ABSTRACT Despite extensive investigations into photophysics at the molecular level, complex interplays between intermolecular interactions, hierarchical assembly, and photoluminescence properties remain a fundamental challenge in materials science, particularly concerning emergent phenomena aggregates. Herein, we construct different dimeric structures both solution aggregate states through cycloreversion upon photoirradiation from series of nonemissive phenanthrene cycloadducts, exhibiting state‐dependent photoactivatable luminescence. Specifically, excimer is due to its antiparallel cofacial structure. In contrast, dimer crystal exhibits nonclassical emission according cross‐stacked stacking within restriction lattice. Prominently, luminescent behavior uniquely accessible photocycloreversion cannot be achieved spontaneous crystallization their parent molecules. Moreover, nature these successfully demonstrated thin films, showcasing potential applications information encryption. This work expands possibilities for constructing new functional by photochemistry deepens our understanding dimer‐luminescence relationships states.

Language: Английский

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