ACS Applied Nano Materials, Journal Year: 2024, Volume and Issue: 7(13), P. 15781 - 15785
Published: June 27, 2024
Language: Английский
Advanced Materials, Journal Year: 2024, Volume and Issue: 36(37)
Published: May 30, 2024
Abstract Colloidal quantum dots (QDs), as a class of 0D semiconductor materials, have generated widespread interest due to their adjustable band gap, exceptional color purity, near‐unity yield, and solution‐processability. With decades dedicated research, the potential applications garnered significant recognition in both academic industrial communities. Furthermore, related dot light‐emitting diodes (QLEDs) stand out one most promising contenders for next‐generation display technologies. Although QD‐based conversion films are applied improve gamut existing technologies, broader application QLED devices remains its nascent stages, facing many challenges on path commercialization. This review encapsulates historical discovery subsequent research advancements QD materials synthesis methods. Additionally, working mechanisms architectural design prototype discussed. surveys latest within industry. The narrative concludes with an examination perspectives technology foreseeable future.
Language: Английский
Citations
31
Journal of Materials Chemistry C, Journal Year: 2024, Volume and Issue: 12(28), P. 10330 - 10389
Published: Jan. 1, 2024
Different applications of semiconductor quantum dots with their unique fundamental properties.
Language: Английский
Citations
20
Angewandte Chemie International Edition, Journal Year: 2023, Volume and Issue: 62(11)
Published: Jan. 21, 2023
Abstract Visible‐light photocatalytic carboxylation with CO 2 is highly important. However, it still remains challenging for reluctant substrates low reduction potentials. Herein, we report a novel of C−N bonds in cyclic amines via consecutive photo‐induced electron transfer (ConPET). It also the first reductive ring‐opening reaction azetidines, pyrrolidines and piperidines. This strategy practical to transform variety easily available valuable β‐, γ‐, δ‐ ϵ‐amino acids moderate‐to‐excellent yields. Moreover, method features mild transition‐metal‐free conditions, high selectivity, good functional‐group tolerance, facile scalability product derivations. Mechanistic studies indicate that ConPET might be key generating reactive photocatalysts, which enable activation generate carbon radicals carbanions as intermediates.
Language: Английский
Citations
43
Angewandte Chemie International Edition, Journal Year: 2023, Volume and Issue: 62(18)
Published: Feb. 25, 2023
Herein, we describe a practical protocol for the removal of alcohol functional groups through reductive cleavage their benzoate ester analogs. This transformation requires strong single electron transfer (SET) reductant and means to accelerate slow fragmentation following substrate reduction. To accomplish this, developed photocatalytic system that generates potent from formate salts alongside Brønsted or Lewis acids promote reduced intermediate. deoxygenation procedure is effective across structurally electronically diverse alcohols enables variety difficult net transformations. no precautions exclude air moisture remains efficient on multigram scale. Finally, can be adapted one-pot benzoylation-deoxygenation sequence enable direct deletion. Mechanistic studies validate role acidic additives key C(sp
Language: Английский
Citations
42
Nature Communications, Journal Year: 2023, Volume and Issue: 14(1)
Published: Aug. 4, 2023
Abstract Dihalogenation of alkenes to the high-added value vicinal dihalides is a prominent process in modern synthetic chemistry. However, their effective conversion still requires use expensive and hazardous agents, sacrificial half-reaction coupling or primary energy input. Here, we show photocatalytically assisted shuttle (p-shuttle) strategy for redox-neutral reversible dihalogenation using low-cost stable 1,2-dihaloethane under visible light illumination. Energetic hot electrons from metal-halide perovskite QDs enable challenging photocatalytic reactions. Ultrafast laser transient absorption spectroscopy have unveiled matching with high reduction potential 1,2-dihaloethane, via two consecutive photoexcitation process. Powered by sustainable as only input, our new catalytic system dibromination, dichlorination even unexplored hetero-dihalogenation, shows good tolerance wide range at room temperature. In contrast homogeneous photocatalysts, chalcogenide other semiconductor catalysts, deliver previously unattainable performance photoredox turnover number over 120,000. This work provides opportunities visible-light-driven heterogeneous catalysis unlocking novel chemical transformations.
Language: Английский
Citations
29
Small, Journal Year: 2023, Volume and Issue: 19(50)
Published: Aug. 26, 2023
A photoelectrochemical (PEC) cell is able to realize effective solar-to-hydrogen energy conversion from water by using the semiconductor photoelectrode. Semiconducting colloidal quantum dots (QDs) with captivating features of size-tunable optoelectronic properties and broad light absorption are regarded as promising photosensitizers in solar-driven PEC systems. Up now, different types QDs have been developed achieve high-efficiency H2 generation, while majority state-of-the-art QDs-PEC systems still fabricated consisting heavy metals (e.g., Cd Pb), which extremely harmful human health natural environment. In this context, substantial efforts made mitigate usage highly toxic concurrently promote development alternative environment-friendly comparable features. This review presents recent advances devices based on several typical carbon QDs, I-III-VI III-V QDs). variety techniques shell thickness tuning, alloying/doping, ligands exchange, etc.) engineer these QD's production thoroughly discussed. Furthermore, critical challenges future perspectives advanced eco-friendly terms QDs' synthesis, photo-induced charge kinetics, operation stability/efficiency briefly proposed.
Language: Английский
Citations
27
Journal of the American Chemical Society, Journal Year: 2023, Volume and Issue: 145(41), P. 22403 - 22412
Published: Oct. 3, 2023
Herein we describe the anion of benzo[b]phenothiazine as a super reductant species upon excitation by visible light. In contrary to N-substituted phenothiazines or benzophenothiazines, this molecule holds extreme reducing power promote single electron transfer-based reductive cleavage at potential -3.51 V vs SCE. As proof, plethora aryl chloride substrates have been reductively cleaved fabricate molecules class isoindolinone and oxindole. Moreover, an aryl-chloride bond has homolytically generate radicals that utilized for C-C cross-coupling C-P formation reactions. To prove its ability, some fluoride bonds radicals. A detailed photophysical study including steady-state time-resolved spectroscopic techniques explain molecule's behavior light excitation, correlates with reactivity pattern. Theoretical calculations disclose benzophenothiazine be slightly puckered ground state is antiaromatic in nature. contrast, excited-state geometry planar, which also close intermediate after one transfer. Abating antiaromaticity anionic partially responsible highly behavior.
Language: Английский
Citations
26
Nature Communications, Journal Year: 2024, Volume and Issue: 15(1)
Published: Jan. 22, 2024
Abstract The open-shell catalytically active species, like radical cations or anions, generated by one-electron transfer of precatalysts are widely used in energy-consuming redox reactions, but their excited-state lifetimes usually short. Here, a closed-shell thioxanthone-hydrogen anion species ( 3 ), which can be photochemically converted to potent and long-lived reductant, is under electrochemical conditions, enabling the electrophotocatalytic hydrogenation. Notably, TfOH regulate potential this system. In presence TfOH, precatalyst 1 ) reduction occur at low potential, so that competitive H 2 evolution inhibited, thus effectively promoting hydrogenation imines. absence reducing ability system reach potency even comparable Na 0 Li , thereby allowing hydrogenation, borylation, stannylation (hetero)arylation aryl halides construct C−H, C−B, C−Sn, C−C bonds.
Language: Английский
Citations
18
ACS Central Science, Journal Year: 2024, Volume and Issue: 10(3), P. 529 - 542
Published: Feb. 26, 2024
Photoredox catalytic processes offer the potential for precise chemical reactions using light and materials. The central determinant is identified as interfacial charge transfer, which simultaneously engenders distinctive behavior in overall reaction. An in-depth elucidation of main mechanism highlighting complexity transfer can occur through both diffusive direct models, revealing its sophisticated design complex transformations. fundamental photophysics uncover these comprehensive applications a clue future development. This research contributes to growing body knowledge on photoredox catalysis sets stage further exploration this fascinating area research.
Language: Английский
Citations
14
Advanced Materials, Journal Year: 2024, Volume and Issue: unknown
Published: Sept. 28, 2024
Abstract Colloidal quantum dots (QDs) have emerged as a versatile photocatalyst for wide range of photocatalytic transformations owing to its high absorption coefficient, large surface‐to‐volume ratio, stability, and efficient charge energy transfer dynamics. The past decades witnessed rapid development QDs artificial photocatalysis. In this review, the unique characteristics are focused on, including size effect, compositional structural diversity, tunable surface chemistry, photophysics, that can be utilized transformations. recent advancements in organic enabled by photocatalysts summarized. opportunities highlighted tackle reactions previously unattainable with small molecule photocatalysts. Lastly, an outlook is provided future directions field.
Language: Английский
Citations
13