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Visible Light Photocatalysis
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Visible Light Photocatalysis

A special issue of Molecules (ISSN 1420-3049). This special issue belongs to the section "Organic Chemistry".

Deadline for manuscript submissions: closed (30 June 2023) | Viewed by 5212

Special Issue Editors

Dr. Prasenjit Mal

E-Mail Website
Guest Editor
School of Chemical Sciences, National Institute of Science Education and Research (NISER), HBNI, Bhubaneswar, PO Bhimpur-Padanpur, District Khurda, Jatni, Odisha 752050, India
Interests: organic photochemistry; supramolecular catalysis; mechanochemistry; weak interactions; hypervalent iodine
Dr. Anima Bose

E-Mail Website
Guest Editor
Department of chemistry, Ravenshaw University, Cuttack-753003, Odisha, India
Interests: visible light photocatalyst; sustainable organic synthesis; organocatalysis; radical chemistry

Special Issue Information

Dear Colleagues,

The photochemical transformations have made a significant impact on synthetic chemistry in recent times by the utilization of visible-light photocatalysts. Therefore, the visible-light photocatalyst has become one of the attractive methods in organic synthesis. Remarkably, the photoredox catalysts have a high functional group tolerance ability, and their mild nature makes them prevalent in organic synthesis. This Special Issue will make a collection of manuscripts that might have value in developing organic chromophores as a sensitizer under visible-light-mediated redox chemistry. The frequently used visible-light photocatalysts are ruthenium and iridium-based complexes, which are primarily pollutants in nature and expensive. Therefore, the use of these photocatalysts in industrial, medicinal, and pharmaceutical applications is usually restricted. Photoredox chemistry of organic chromophores is underdeveloped due to the lack of available information about their redox potential, reaction kinetics, and photophysical properties. This Special Issue will benefit the synthetic community in large so that many researchers can come up with designs to perform chemical transformations using environmentally benign visible-light photocatalyst.

Dr. Prasenjit Mal
Dr. Anima Bose
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Molecules is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2700 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • green synthesis
  • hypervalent iodine reagents
  • metal-free
  • photochemistry
  • photoredox-organocatalysis
  • visible-light

Published Papers (3 papers)

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Research

15 pages, 5010 KiB  
Article
N,N′-Diaryldihydrophenazines as a Sustainable and Cost-Effective Alternative to Precious Metal Complexes in the Photoredox-Catalyzed Alkylation of Aryl Alkyl Ketones
by Dmitry A. Dulov, Alexey V. Bogdanov, Sergey G. Dorofeev and Tatiana V. Magdesieva
Molecules 2023, 28(1), 221; https://doi.org/10.3390/molecules28010221 - 27 Dec 2022
Cited by 1 | Viewed by 2059
Abstract
An inexpensive and highly efficient metal-free alternative to commonly used Ru- and Ir-based catalysts was proposed. It was shown that the new 2,7-di-tert-butyl-5,10-bis(4-trifluoromethylphenyl)-5,10-dihydrophenazine outcompeted the iridium phenylpyridyl complex in photoredox activity in the alkylation of silyl enol ethers yielding aryl alkyl [...] Read more.
An inexpensive and highly efficient metal-free alternative to commonly used Ru- and Ir-based catalysts was proposed. It was shown that the new 2,7-di-tert-butyl-5,10-bis(4-trifluoromethylphenyl)-5,10-dihydrophenazine outcompeted the iridium phenylpyridyl complex in photoredox activity in the alkylation of silyl enol ethers yielding aryl alkyl ketones. The reaction occurred under visible light irradiation at room temperature and was also applicable to drug derivatives (ibuprofen and naproxen). In-depth photophysical, electrochemical, and quantum chemical studies showed that the aforementioned N,N-diaryldihydrophenazine exhibited enhanced properties that were essential for the photoredox catalysis (a long-lived triplet excited state, strong reducing ability, high stability of the radical cations formed in single-electron-transfer event, and chemical inertness of the catalyst with respect to reactants). Importantly, the substituted N,N′-diaryldihydrophenazines could be obtained directly from diaryl amines; a facile, easily handled and scaled-up one-pot synthetic procedure was elaborated. Full article
(This article belongs to the Special Issue Visible Light Photocatalysis)
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14 pages, 5115 KiB  
Article
Hydrothermal Synthesis of Cadmium Sulfide Photocatalyst for Detoxification of Azo Dyes and Ofloxacin Antibiotic in Wastewater
by Teeradech Senasu, Nattakarn Ruengchai, Sarawoot Khamdon, Narubeth Lorwanishpaisarn and Suwat Nanan
Molecules 2022, 27(22), 7944; https://doi.org/10.3390/molecules27227944 - 16 Nov 2022
Cited by 6 | Viewed by 1431
Abstract
The complete detoxification of harmful dyes and antibiotics from aqueous solution is essential for environmental remediation. The present work focuses on a facile hydrothermal synthesis of a cadmium sulfide (CdS) photocatalyst using thioacetamide as a sulfur source. The synthesized CdS showed a hexagonal [...] Read more.
The complete detoxification of harmful dyes and antibiotics from aqueous solution is essential for environmental remediation. The present work focuses on a facile hydrothermal synthesis of a cadmium sulfide (CdS) photocatalyst using thioacetamide as a sulfur source. The synthesized CdS showed a hexagonal phase with an energy gap of 2.27 eV, suggesting the promising visible-light-responsive semiconducting photocatalyst. The photoactivity of the prepared CdS was investigated by evaluating the degradation of the Reactive red 141 (RR141) dye, Congo red (CR) dye, and ofloxacin (OFL) antibiotic. After only 180 min of solar light illumination, a high performance of 98%, 97%, and 87% toward degradation of RR141, CR, and OFL was obtained. The photodegradation of the pollutants agrees well with the first-order kinetic model. The rate constant of 0.055 min−1, 0.040 min−1, and 0.026 min−1, respectively, was reported toward degradation of RR141, CR, and OFL. Photogenerated holes and hydroxyl radicals play a vital role in removing toxic organic contaminants. The chemical stability of the prepared CdS was also confirmed. The synthesized CdS photocatalyst still maintains high photocatalytic performance even after five consecutive cycles of use, indicating its excellent cycling ability. The present research shows a facile route to fabricate a CdS photocatalyst to completely detoxify harmful organic pollutants, including dyes and antibiotics, in the environment. Full article
(This article belongs to the Special Issue Visible Light Photocatalysis)
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6 pages, 1198 KiB  
Article
Construction of Benzenesulfonamide Derivatives via Copper and Visible Light-induced Azides and S(O)2–H Coupling
by Zhipeng Liang, Ya-Nan Wu and Yang Wang
Molecules 2022, 27(17), 5539; https://doi.org/10.3390/molecules27175539 - 28 Aug 2022
Viewed by 1242
Abstract
We here have developed an S(O)2–N coupling between phenylsulfinic acid derivatives and aryl azides by dual copper and visible light catalysis. In this efficient and mild pathway, the reaction produces sulfonamide compounds under redox-neutral condition, which is mechanistically different from the [...] Read more.
We here have developed an S(O)2–N coupling between phenylsulfinic acid derivatives and aryl azides by dual copper and visible light catalysis. In this efficient and mild pathway, the reaction produces sulfonamide compounds under redox-neutral condition, which is mechanistically different from the nitrogen nucleophilic substitution reactions. Significantly, this transformation intends to utilize the property of visible light-induced azides to generate triplet nitrene and followed coupling with sulfonyl radicals in situ to achieve structurally diverse benzenesulfinamides in good yields. Full article
(This article belongs to the Special Issue Visible Light Photocatalysis)
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