Ferrocene-Mediated Photocatalytic Annulation of N-Sulfonyl Ketimines on a Polycrystalline WSe₂ Semiconductor Photocatalyst

ACS Catalysis, Год журнала: 2023, Номер 13(19), С. 13071 - 13076

Опубликована: Сен. 22, 2023

A merger of heterogeneous polycrystalline WSe2 semiconductor photocatalysis and homogeneous ferrocene redox catalysis for the cascade radical coupling-annulation reactions was established. In redox-mediated photocatalysis, can improve separation photogenerated hole–electron pairs on by consuming hole via formation a cation, which triggered molecular transformations. Various benzo[e]imidazo[1,5-c][1,2,3]oxathiazine 5,5-dioxides were formed through semiheterogeneous three-component reaction N-sulfonyl ketimines, N-arylglycines, formaldehyde.

Язык: Английский

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Efficacy of Perovskite Photocatalysis: Challenges to Overcome

ACS Energy Letters, Год журнала: 2022, Номер 7(6), С. 1994 - 2011

Опубликована: Май 18, 2022

Having gained prominence in the design of high-efficiency solar cells, metal halide perovskites have taken center stage photocatalysis. Despite demonstrations photocatalytic activity inducing reduction and oxidation processes through visible-light excitation, long-term stability CsPbBr3 other perovskite nanocrystals nanostructures still poses a challenge. This Perspective discusses how factors such as instability arising from labile ligands, ease exchange, mobility under photoirradiation, chemical morphological transformations polar solvents, difficulty designing heterostructures pose major hurdles developing photocatalysts. The key examples organic inorganic well interfacial charge-transfer discussed here present some unique features photocatalysts highlight complexity their utilization for future conversion processes. Strategies to protect surface are needed maintain required practical applications.

Язык: Английский

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Visible light-induced Z-scheme V2O5/g-C3N4 heterojunction catalyzed cascade reaction of unactivated alkenes

CHINESE JOURNAL OF CATALYSIS (CHINESE VERSION), Год журнала: 2022, Номер 44, С. 111 - 116

Опубликована: Дек. 2, 2022

Язык: Английский

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External photocatalyst-free C-H alkylation of N-sulfonyl ketimines with alkanes under visible light

Chinese Chemical Letters, Год журнала: 2023, Номер 34(9), С. 108509 - 108509

Опубликована: Апрель 28, 2023

Язык: Английский

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Ferrocene/air double-mediated FeTiO₃-photocatalyzed semi-heterogeneous annulation of quinoxalin-2(1H)-ones in EtOH/H₂O

Chemical Communications, Год журнала: 2023, Номер 59(94), С. 14029 - 14032

Опубликована: Янв. 1, 2023

With both ferrocene and air as the redox catalysts, for first time, low-cost natural ilmenite (FeTiO3) was successfully used photocatalytic bond formations. Under assistance of a traceless H-bond, HCHO methylene reagent, variety imidazo[1,5-a]quinoxalinones were semi-heterogeneously photosynthesized in high yields with good functional group compatibility.

Язык: Английский

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EtOH-catalyzed electrosynthesis of imidazolidine-fused sulfamidates fromN-sulfonyl ketimines,N-arylglycines and formaldehyde

Green Chemistry, Год журнала: 2023, Номер 25(14), С. 5539 - 5542

Опубликована: Янв. 1, 2023

With formaldehyde as an atom-economical carbonyl synthon, the EtOH-catalyzed electrochemical multicomponent synthesis of various imidazolidine-fused sulfamidates under organic oxidant-free, energy-saving and mild conditions was developed.

Язык: Английский

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CuAs₂O₄: Design, Hydrothermal Synthesis, Crystal Structure, Photocatalytic Dye Degradation, Hydrogen Evolution Reaction, Knoevenagel Condensation Reaction, and Thermal Studies

Inorganic Chemistry, Год журнала: 2024, Номер 63(6), С. 2919 - 2933

Опубликована: Фев. 1, 2024

CuAs2O4 has been explored as a heterogeneous catalyst in the fields of photocatalysis, electrocatalysis, and solvent-free organic transformation reactions. The homogeneity successfully attained for first time by designing pH-assisted hydrothermal synthesis technique. Single-crystal X-ray diffraction studies reveal that no phase transition observed lowering temperature up to 103 K with existence satellite reflections. crystal structure exhibits tetragonal symmetry space group P42/mbc consists [CuO6] octahedra [AsO3E] tetrahedra (E represents stereochemically active lone pair). Structural investigation shows cylindrical void inside structure, which could lead interesting physical chemical properties. photocatalytic dye degradation efficiency methylene blue (MB) showed ∼100% degradation, though increased 2-fold addition 6% H2O2. reusability 10th cycle ∼35% MB established. It can exhibit HER activity low overpotential 165 mV respect RHE attain current density j = 10 mA cm–2. SEM TEM revealed rod-shaped particles, supported large number catalytic sites. structural consistency after photodegradation is confirmed PXRD pattern. XPS confirms oxidation state Cu As compound. toward Knoevenagel condensation reaction at moderate under condition also studied. TG-DTA an endothermic minimum (Tmin) 436 °C due mass loss As2O3.

Язык: Английский

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CsPbBr₃ Perovskite Polyhedral Nanocrystal Photocatalysts for Decarboxylative Alkylation via C_sp³–H Bond Activation of Unactivated Ethers

ACS Catalysis, Год журнала: 2024, Номер 14(9), С. 6633 - 6643

Опубликована: Апрель 16, 2024

Halide perovskite nanocrystals have recently emerged as high-performance light-harvesting materials. They are also extensively studied for the fabrication of both light-emitting and photovoltaic devices. In comparison, their implementation photocatalysts to trigger different organic reactions is limited. To add more diversity in catalysis, herein, shapes heterostructures CsPbBr3 polyhedral explored visible-light-mediated room temperature photocatalytic Csp3–H bond-activated alkylation cyclic ether using feedstock α,β-unsaturated acids keto-alkyl source. It started with decarboxylative coupling cinnamic acid at α-position tetrahydrofuran (THF) extended several derivatives. The facets matter, hence, differently shaped showed variable rates catalytic activities. With density functional theory calculation, surface-adsorption-induced charge carrier transfer mechanism facilitate such established. Different semiconductors noble metal that quenched emission compared, inactiveness catalysis was correlated proposed mechanism. Combining all these observations, roles light, surfaces, oxygen, nature hosts, other material analyzed detail reported. Such bond activation can lead complex chemical scaffolds, unveiling an underexplored domain heterogeneous Csp3–Csp3 cross-coupling.

Язык: Английский

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Charge Transfer in Photoexcited Cesium–Lead Halide Perovskite Nanocrystals: Review of Materials and Applications

ACS Applied Nano Materials, Год журнала: 2022, Номер 5(8), С. 10097 - 10117

Опубликована: Июль 27, 2022

Cesium–lead halide (CsPbX3) perovskite nanocrystals (PNCs) have attracted significant attention from researchers because of their essential optoelectronic properties, especially long charge-carrier transfer, high efficiency in visible-light absorption, excited-state lifetimes, etc. Because these materials exhibit outstanding charge transfer and separation, which allows them to be used for solar cell applications. Recently, CsPbX3 perovskites emerged as photocatalysts. In photovoltaics or photocatalysis, upon photoexcitation, the exciton dissociates, electron/hole is transmitted conduction/valence bands acceptors. Therefore, it understand how occurs at PNC interface, can help a researcher maximize output cells photocatalytic efficiency. Specifically, we emphasize using PNCs electron hole donors this review. We outlined different charge-transfer dynamics based on critical factors discussed properties. Electron/hole-transfer are most concerning characteristic; thus, reviewed relevant literature that reported efficient electron/hole-transfer performance. end, highlighted recent developments use photocatalysts organic synthesis.

Язык: Английский

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CsPbBr₃ in the Activation of the C–Br Bond of CBrX₃ (X = Cl, Br) under Sunlight

Chemistry of Materials, Год журнала: 2023, Номер 35(2), С. 628 - 637

Опубликована: Янв. 3, 2023

A newly synthesized green-fluorescent, orthorhombic, bromide-rich, perovskite nanocrystal (Φ ∼ 0.93, τ 12.5 ns, Eox = +1.6 V) obtained from an unprecedented bromide precursor dibromoisocyanuric acid was found to be excellent visible-light (sunlight or blue-light-emitting diode (LED)) photocatalyst toward the synthesis of gem-dihaloenones for first time. The photoactivated CsPbBr3 catalyzed homolytic cleavage CBrX3 (X Cl, Br) generate •CX3 radical, which underwent cascaded C–C cross-coupling with terminal alkynes into corresponding gem-dihaloenones. Radical-trapping experiments and luminescence-quenching studies helped establish a single-electron-transfer (SET) mechanism. Interestingly, other highly stable NCs, N-bromosuccinimide (NBS) dibromohydantoin (DBHT) precursors, are unable carry out these transformations. These results not only enrich synthetic methodology but also encourage research community develop efficient cost-effective photocatalytic materials.

Язык: Английский

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