scholarly journals CF3-Bis-TEMPO-Vis: New Visible Light Active Bis-Benzimidazolequinone Alkoxyamine

Molbank ◽  
10.3390/m1300 ◽  
2021 ◽  
Vol 2021 (4) ◽  
pp. M1300
Author(s):  
Patrick Kielty ◽  
Pau Farràs ◽  
Dennis A. Smith ◽  
Fawaz Aldabbagh
Keyword(s):  
Visible Light ◽  
Room Temperature ◽  
Green Light ◽  
Basic Work ◽  
Visible Light Active ◽  
Work Up

Alkoxyamines of TEMPO usually dissociate thermally at >100 °C; however, room temperature homolysis, activated by visible light, occurs with benzimidazolequinone derivatives. 1,1’-Dimethyl-2,2’-bis{[(2,2,6,6-tetramethylpiperidin-1-yl)oxy]methyl}-6-(trifluoromethyl)-1H,1’H-[5,5’-bibenzimidazole]-4,4’,7,7’-tetrone (CF3-Bis-TEMPO-Vis) is prepared in a 59% yield through NBS/H2SO4 oxidative demethylations of the dimethoxybenzimidazole-benzimidazolequinone precursor with aqueous work up. The alternative basic work up in air gave the epoxide derivative of CF3-Bis-TEMPO-Vis. Unlike the latter CF3-epoxide, both alkoxyamine residues are labile under green light (470–600 nm), and the rate of TEMPO release is three times slower than Bis-TEMPO-Vis.

scholarly journals Activity of Visible-Light-Active Titanium Oxide Photocatalysts Emerged by Monochromatic Blue and Green Light Emitted Photodiode and Their Durability

2003 ◽  
Vol 76 (7) ◽  
pp. 254-259
Author(s):  
Masahiro MIYOSHI ◽  
Atsushi ISHII ◽  
Yoshinobu YAMANE ◽  
Tatsuhiko IHARA ◽  
Yu IRIYAMA ◽  
...  
Keyword(s):  
Visible Light ◽  
Titanium Oxide ◽  
Green Light ◽  
Visible Light Active

scholarly journals Visible-Light-Driven Room Temperature NO2 Gas Sensor Based on Localized Surface Plasmon Resonance: The Case of Gold Nanoparticle Decorated Zinc Oxide Nanorods (ZnO NRs)

Chemosensors ◽  
2022 ◽  
Vol 10 (1) ◽  
pp. 28
Author(s):  
Qomaruddin ◽  
Olga Casals ◽  
Hutomo Suryo Wasisto ◽  
Andreas Waag ◽  
Joan Daniel Prades ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Visible Light ◽  
Surface Plasmon ◽  
Room Temperature ◽  
Green Light ◽  
Zinc Oxide Nanorods ◽  
Localized Surface Plasmon ◽  
Light Illumination ◽  
Au Nps ◽  
Oxide Nanorods

In this work, nitrogen dioxide (NO2) gas sensors based on zinc oxide nanorods (ZnO NRs) decorated with gold nanoparticles (Au NPs) working under visible-light illumination with different wavelengths at room temperature are presented. The contribution of localized surface plasmon resonant (LSPR) by Au NPs attached to the ZnO NRs is demonstrated. According to our results, the presence of LSPR not only extends the functionality of ZnO NRs towards longer wavelengths (green light) but also increases the response at shorter wavelengths (blue light) by providing new inter-band gap energetic states. Finally, the sensing mechanism based on LSPR Au NPs is proposed.

scholarly journals Photocatalytic and Magnetic Behaviors Observed in BiFeO3Nanofibers by Electrospinning

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Xuehui Zhang ◽  
Haiyang Liu ◽  
Bin Zheng ◽  
Yuanhua Lin ◽  
Deping Liu ◽  
...  
Keyword(s):  
Visible Light ◽  
Band Gap ◽  
Room Temperature ◽  
Photocatalytic Property ◽  
Magnetic Ordering ◽  
Confinement Effect ◽  
Visible Light Active ◽  
Perovskite Type ◽  
Size Confinement ◽  
Weak Ferromagnetic

Perovskite-type BiFeO3nanofibers with wave nodes-like morphology were prepared by electrospinning. The nanofibers show a highly enhanced visible-light-active photocatalytic property. The results also showed that the diameter could affect the band gap and photocatalytic performances of nanofibers. Additionally, weak ferromagnetic behaviors can be observed at room temperature, which should be correlated to the size-confinement effect on the magnetic ordering of BiFeO3structure.

Visible-light-induced [4 + 2] cycloaddition of pentafulvenes by organic photoredox catalysis

2020 ◽  
Vol 18 (40) ◽  
pp. 8074-8078
Author(s):  
Kenta Tanaka ◽  
Yosuke Asada ◽  
Yujiro Hoshino ◽  
Kiyoshi Honda
Keyword(s):  
Visible Light ◽  
Room Temperature ◽  
Green Light ◽  
Light Irradiation ◽  
Photoredox Catalysis

We have developed thioxanthylium photoredox catalyzed [4 + 2] cycloaddition of pentafulvenes at room temperature under green light irradiation, which affords tetrahydrocyclopenta[b]chromenes with high regioselectivities.

Visible Light Active Ce-doped TiO2 Nanoparticles for Photocatalytic Degradation of Methylene Blue

2016 ◽  
Vol 13 (1) ◽  
pp. 110-116 ◽  
Author(s):  
Rani P. Barkul ◽  
Farah-Naaz A. Shaikh ◽  
Sagar D. Delekar ◽  
Meghshyam K. Patil
Keyword(s):  
Methylene Blue ◽  
Visible Light ◽  
Photocatalytic Degradation ◽  
Tio2 Nanoparticles ◽  
Doped Tio2 ◽  
Visible Light Active

Green Synthesis of ZnO/Dy/NiO Heterostructures for Enhanced Photocatalytic Applications

2020 ◽  
Vol 1 (1) ◽  
pp. 30-36
Author(s):  
Shubha Jayachamarajapura Pranesh ◽  
Diwya Lanka
Keyword(s):  
Visible Light ◽  
Uv Light ◽  
Combustion Method ◽  
Hybrid Nanocomposites ◽  
Synthetic Dyes ◽  
Hybrid Nanostructure ◽  
Wide Range ◽  
Visible Light Active ◽  
Textile Industries ◽  
Photocatalytic Applications

Background: Textile industries discharge harmful synthetic dyes to nearby water sources. These colour effluents should be treated before discharge to reduce the toxicity caused by synthetic colours. Objective: To synthesize visible light active superstructures to reduce water pollution caused by textile industries. Methods: We have successfully synthesized ZnO/Dy/NiO hybrid nanocomposites using waste curd as fuel by a simple combustion method. The obtained material was able to reduce recombination and enhanced the photocatalytic degradation of organic pollutants. The as-synthesized material was characterized by XRD, absorption spectroscopy, FESEM, EDAX, etc. The obtained hybrid nanostructure was used as a photocatalyst for the degradation of methylene blue under sunlight, UV light as well as in dark. Comparative experiments were carried out with a variation of catalytic load, pH, dye concentrations, etc. for a better understanding of the performance of the catalyst at various conditions. Results and Conclusion: The ternary compound shows wide range of absorption by expanding absorption band both in UV and visible regions. ZnO/Dy/NiO hybrid nanocomposites performed well and showed uniqueness in the activity uder visible light.

The Merger of CF3SO2Na and Palladium Catalysis to Enable Decarboxylative Cross-Coupling for the Synthesis of Aromatic Ketones under Room Temperature

2021 ◽  
Author(s):  
Pan Xie ◽  
Cheng Xue ◽  
Cancan Wang ◽  
Dongdong Du ◽  
Sanshan Shi
Keyword(s):  
Visible Light ◽  
Room Temperature ◽  
Palladium Catalysis ◽  
Cross Coupling ◽  
Boronic Acids ◽  
Aromatic Ketones ◽  
Aryl Ketones ◽  
Oxocarboxylic Acids

A CF3SO2Na/Pd(OAc)2 co-catalyzed strategy is developed to produce aryl ketones via visible-light-induced decarboxylative cross-coupling of α-oxocarboxylic acids and aryl boronic acids. This process was perfomed under air at room temperature,...

LaTaON2-BaTaO2N solid solution for water oxidation

2021 ◽  
Author(s):  
Yuwei Zhang ◽  
Xiaoxiang Xu
Keyword(s):  
Solid Solution ◽  
Visible Light ◽  
Water Oxidation ◽  
Oxidation Reactions ◽  
Visible Light Active

Solid solution of LaTaON2 and BaTaO2N, i.e., La1-xBaxTaO1+yN2-y (0 ≤ x, y ≤ 1), have been investigated as visible-light-active photocatalysts for water oxidation reactions. A number of important parameters such...

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