Visible-Light-Promoted Efficient Aerobic Dehydrogenation of N-Heterocycles by a Tiny Organic Semiconductor Under Ambient Conditions

2020 ◽  
Vol 2020 (13) ◽  
pp. 1956-1960 ◽  
Author(s):  
Kunyi Yu ◽  
Hanjie Zhang ◽  
Chenliang Su ◽  
Yongfa Zhu
Keyword(s):  
Visible Light ◽  
Organic Semiconductor ◽  
Ambient Conditions

scholarly journals Selective Catalytic Conversion of Acetylene to Ethylene Powered by Water and Visible Light

2021 ◽  
Author(s):  
Francesca Arcudi ◽  
Luka Dordevik ◽  
Neil Schweitzer ◽  
Samuel Stupp ◽  
Emily Weiss
Keyword(s):  
High Temperature ◽  
Visible Light ◽  
Organic Semiconductor ◽  
State Of The Art ◽  
Ambient Conditions ◽  
Molecular Catalyst ◽  
Noble Metal Catalysts ◽  
Photocatalytic System ◽  
Proton Source ◽  
Earth Abundant

Abstract The production of polymer-grade ethylene requires the purification of ethylene feed from acetylene contaminant. Accomplishing this task by state-of-the-art thermal hydrogenation requires high temperature, external feed of H2 gas, and noble metal catalysts, and is not only expensive and energy-intensive but also prone to overhydrogenate to ethane. We report a photocatalytic system to reduce acetylene to ethylene with >99% selectivity for ethylene under both non-competitive (no ethylene co-feed) and competitive (ethylene co-feed) conditions, and near 100% conversion under the latter industrially relevant condition. Our system uses a molecular catalyst based on earth-abundant cobalt operating under ambient conditions and sensitized by either [Ru(bpy)3]2+ or an inexpensive organic semiconductor (mpg-CN) under visible light. These features and the use of water as a proton source offer substantial advantages over current hydrogenation technologies with respect to selectivity and sustainability.

Visible-light-initiated Catalyst-free Oxidative Cleavage of Triaryl-Substituted Alkenes C=C Bonds under Ambient Conditions

2021 ◽  
Author(s):  
Wenjing Li ◽  
Shun Li ◽  
Lihua Luo ◽  
Yichen Ge ◽  
Jiaqi Xu ◽  
...  
Keyword(s):  
Visible Light ◽  
Room Temperature ◽  
Ambient Air ◽  
Oxidative Cleavage ◽  
Ambient Conditions ◽  
Blue Led ◽  
Catalyst Free

The catalyst-free oxidative cleavage of (Z)-triaryl-substituted alkenes bearing pyridyl motif with ambient air under irradiation of blue LED at room temperature has been developed. The reaction was facile and scalable,...

scholarly journals Mizoroki–Heck type reactions and synthesis of 1,4-dicarbonyl compounds by heterogeneous organic semiconductor photocatalysis

2021 ◽  
Vol 23 (5) ◽  
pp. 2017-2024
Author(s):  
Jagadish Khamrai ◽  
Saikat Das ◽  
Aleksandr Savateev ◽  
Markus Antonietti ◽  
Burkhard König
Keyword(s):  
Visible Light ◽  
Vinyl Acetate ◽  
Organic Semiconductor ◽  
Alkyl Halides ◽  
Visible Light Photocatalysis ◽  
Dicarbonyl Compounds ◽  
Semiconductor Photocatalysis ◽  
Type Coupling ◽  
Styrene Derivatives ◽  
Tertiary Alkyl

We report the synthesis of 1,4-dicarbonyl compounds and substituted alkenes (Mizoroki–Heck type coupling) starting from secondary and tertiary alkyl halides and vinyl acetate or styrene derivatives using visible-light photocatalysis.

Polyimide with enhanced π stacking for efficient visible-light-driven photocatalysis

2021 ◽  
Author(s):  
Kelian Zhang ◽  
Hanmei Li ◽  
Haixian Shi ◽  
Wei Hong
Keyword(s):  
Visible Light ◽  
Surface Area ◽  
Organic Semiconductor ◽  
Light Harvesting ◽  
Photocatalytic Efficiency ◽  
Π Stacking ◽  
Visible Light Driven ◽  
Donor Acceptor

The organic semiconductor of polyimide has received considerable attention as a chemically stable donor-acceptor photocatalyst, yet exhibits moderate photocatalytic efficiency which is limited by low surface area, insufficient light harvesting...

scholarly journals Selective Oxofunctionalization of Cyclohexene over Titanium Dioxide-Based and Bismuth Oxyhalide Photocatalysts by Visible Light Irradiation

Catalysts ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 1448
Author(s):  
Adolfo Henríquez ◽  
Héctor D. Mansilla ◽  
Azael Martínez-de la Cruz ◽  
Lorena Cornejo-Ponce ◽  
Eduardo Schott ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Visible Light ◽  
Molecular Oxygen ◽  
Low Cost ◽  
Ambient Conditions ◽  
Metal Halide Lamp ◽  
Relevant Role ◽  
Bismuth Oxyhalide ◽  
Potential Use ◽  
Oxygenated Products

Photocatalysis driven under visible light allows us to carry out hydrocarbon oxofunctionalization under ambient conditions, using molecular oxygen as a sacrificial reagent, with the absence of hazardous subproducts and the potential use of the Sun as a clean and low-cost source of light. In this work, eight materials—five based on titanium dioxide and three based on bismuth oxyhalides—were used as photocatalysts in the selective oxofunctionalization of cyclohexene. The cyclohexane oxofunctionalization reactions were performed inside of a homemade photoreactor equipped with a 400 W metal halide lamp and injected air as a source of molecular oxygen. In all assayed systems, the main oxygenated products, identified by mass spectrometry, were 1,2-epoxycyclohexane, 2-cyclohexen-1-ol, and 2-cyclohexen-1-one. Titanium dioxide-based materials exhibited higher selectivities for 1,2-epoxycyclohexane than bismuth oxyhalide-based materials. In addition to this, titanium dioxide doped with iron exhibited the best selectivity for 1,2-epoxycyclohexane, demonstrating that iron plays a relevant role in the cyclohexene epoxidation process.

scholarly journals Vis-Responsive Copper-Modified Titania for Decomposition of Organic Compounds and Microorganisms

Catalysts ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 1194
Author(s):  
Maya Endo-Kimura ◽  
Bariş Karabiyik ◽  
Kunlei Wang ◽  
Zhishun Wei ◽  
Bunsho Ohtani ◽  
...  
Keyword(s):  
Visible Light ◽  
Photoelectron Spectroscopy ◽  
Water Oxidation ◽  
Diffuse Reflectance Spectroscopy ◽  
Antimicrobial Properties ◽  
Localized Surface Plasmon ◽  
Intrinsic Activity ◽  
Ambient Conditions ◽  
Copper Species ◽  
X Ray

Seven commercial titania (titanium(IV) oxide; TiO2) powders with different structural properties and crystalline compositions (anatase/rutile) were modified with copper by two variants of a photodeposition method, i.e., methanol dehydrogenation and water oxidation. The samples were characterized by diffuse reflectance spectroscopy (DRS), X-ray powder diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS) and X-ray photoelectron spectroscopy (XPS). Although zero-valent copper was deposited on the surface of titania, oxidized forms of copper, post-formed in ambient conditions, were also detected in dried samples. All samples could absorb visible light (vis), due to localized surface plasmon resonance (LSPR) of zero-valent copper and by other copper species, including Cu2O, CuO and CuxO (x:1-2). The photocatalytic activities of samples were investigated under both ultraviolet (UV) and visible light irradiation (>450 nm) for oxidative decomposition of acetic acid. It was found that titania modification with copper significantly enhanced the photocatalytic activity, especially for anatase samples. The prolonged irradiation (from 1 to 5 h) during samples’ preparation resulted in aggregation of copper deposits, thus being detrimental for vis activity. It is proposed that oxidized forms of copper are more active under vis irradiation than plasmonic one. Antimicrobial properties against bacteria (Escherichia coli) and fungi (Aspergillus niger) under vis irradiation and in the dark confirmed that Cu/TiO2 exhibits a high antibacterial effect, mainly due to the intrinsic activity of copper species.

Facile fabrication of triphenylamine-based conjugated porous polymers and their application in organic degradation under visible light

2020 ◽  
Vol 44 (7) ◽  
pp. 2986-2995 ◽  
Author(s):  
Lidan Lan ◽  
Fei Liu ◽  
Yi Dan ◽  
Long Jiang
Keyword(s):  
Schiff Base ◽  
Visible Light ◽  
Porous Polymers ◽  
Fabrication Method ◽  
Ambient Conditions ◽  
One Pot ◽  
Organic Degradation ◽  
One Pot Synthesis ◽  
Facile Fabrication ◽  
The One

A facile fabrication method was developed for the one-pot synthesis of 1,3,5-triformylbenzene (TFB)-4,4′4′′-triaminotriphenylamine (TPA) and 1,3,5-triformylbenzene-terephthalaldehyde (TA) under ambient conditions via a Schiff-base reaction.

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