Special Issue "Photocatalytic Organic Synthesis"

A special issue of Catalysts (ISSN 2073-4344). This special issue belongs to the section "Photocatalysis".

Deadline for manuscript submissions: 31 May 2019

Special Issue Editors

Guest Editor
Dr. Cláudia Gomes Silva

Laboratory of Separation and Reaction Engineering - Laboratory of Catalysis and Materials (Associate Laboratory LSRE-LCM), Department of Chemical Engineering, Faculdade de Engenharia da Universidade do Porto (FEUP), Rua Dr. Roberto Frias s/n, 4200-465 Porto, Portugal
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Interests: Interests: photocatalytic science and technology; heterogeneous catalysis; environmental catalysis; green chemistry; fine chemical synthesis; solar fuels; materials science; chemical engineering
Guest Editor
Prof. Joaquim Luís Faria

Laboratory of Separation and Reaction Engineering - Laboratory of Catalysis and Materials (Associate Laboratory LSRE-LCM), Department of Chemical Engineering, Faculdade de Engenharia da Universidade do Porto (FEUP), Rua Dr. Roberto Frias s/n, 4200-465 Porto, Portugal
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Phone: +351 220 413 683
Fax: +351 225 081 449
Interests: catalysis and photocatalysis; physical-organic chemistry; chemistry and materials science; spectroscopic techniques; fine chemical synthesis; advanced oxidation processes; solar fuels; nanotechnology and nanoscience; biophysics and biochemistry; chemical education and science communication; chemical engineering

Special Issue Information

Dear Colleagues,

The use of light for the activation of organic reactions has emerged in the last decade, pushed by the need to implement energy-efficient and greener processes. Initially bounded to UV-excitation due to exclusive use of TiO2 semiconductor optical photocatalysts, this process has extended its applicability through the use of other optical photocatalysts with visible excitation and by the development of more effective and versatile light sources, such has light-emitting diodes.

While conventional industrial synthesis processes normally require harsh reaction conditions and the use of noxious solvents, photocatalytic organic synthesis is able to produce fine chemicals under mild conditions, in environmentally-friendly processes, be they sunlight activated, or using artificial irradiation sources with low-energy consumption. Yet, the success of such processes will rely on the combination of a multidisciplinary approach grounded in the concepts of  organic chemistry, materials science, chemical and reaction engineering, and nanoscience and nanotechnology.

Authors with expertise in any of the above topics dealing with successful use of photocatalysis in near UV to Visible light induced organic transformations are cordially invited to submit their manuscripts to this Special Issue of Catalysts. Significant full papers and review articles are very welcome. The topics of the Special Issue will cover various aspects of photocatalysis for organic synthesis in all of its diversity, as well other areas on the boundaries, such as organic photoredox catalysis, molecular photocatalysis, photocatalytic applications of nanoscience, photocatalysis in fine chemistry, light mediated free radical synthesis and photocatalytic synthesis of natural products.

Dr. Cláudia Gomes Silva
Prof. Joaquim Luís Faria
Guest Editor

Manuscript Submission Information

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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. Catalysts is an international peer-reviewed open access monthly journal published by MDPI.

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Keywords

  • Photocatalysis
  • Organic synthesis
  • Fine chemicals
  • Green chemistry
  • Homogeneous and heterogeneous photoredox reactions
  • Photocatalytic materials
  • Photocatalytic Reaction Engineering
  • Kinetic and mechanistic studies
  • New photoreactors and light sources
  • Scale-up and intensification of photocatalytic processes

Published Papers (4 papers)

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Research

Open AccessArticle New Functionalized Polycycles Obtained by Photocatalytic Oxygenation Using Mn(III) Porphyrins in Basic Media
Catalysts 2019, 9(4), 304; https://doi.org/10.3390/catal9040304
Received: 28 February 2019 / Revised: 20 March 2019 / Accepted: 22 March 2019 / Published: 27 March 2019
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Abstract
According to our earlier observations, the products of photocatalytic oxygenations of furan and thiophene derivatives of benzobicyclo[3.2.1]octadiene with anionic and cationic manganese(III) porphyrin at pH = 7 strongly depended on the type and position of the heteroatom in the aromatic ring, as well [...] Read more.
According to our earlier observations, the products of photocatalytic oxygenations of furan and thiophene derivatives of benzobicyclo[3.2.1]octadiene with anionic and cationic manganese(III) porphyrin at pH = 7 strongly depended on the type and position of the heteroatom in the aromatic ring, as well as the charge of the photocatalyst. Hence, a significant pH increase (to 10) in these systems offered a reasonable tool to affect the diversity and yields of the oxygenation products. They were quantitatively separated by TLC and identified with NMR analyses. The results clearly indicated that the increase of HO concentration, in most cases, considerably changed the product yield, e.g., enhanced it to 70% for the hydroxy-furyl derivative. Accordingly, the selectivity of the oxygenation of the furan compound could be improved in this way. In the case of one thienyl compound, however, even an additional product appeared, while the yields of the products of the other thiophene derivative (with cationic catalyst) decreased to zero, suggesting the application of lower pH for preparative purposes. The pH effects indicate that oxygenation reactions in these systems involve more photochemically generated oxidative agents, e.g., OH and (P)Mn(V)=O), the role of which is affected by the pH increase in various ways. Full article
(This article belongs to the Special Issue Photocatalytic Organic Synthesis)
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Open AccessArticle Efficient Dye-Sensitized Solar Cells Composed of Nanostructural ZnO Doped with Ti
Catalysts 2019, 9(3), 273; https://doi.org/10.3390/catal9030273
Received: 27 February 2019 / Revised: 9 March 2019 / Accepted: 10 March 2019 / Published: 17 March 2019
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Abstract
Photoanode materials with optimized particle sizes, excellent surface area and dye loading capability are preferred in good-performance dye sensitized solar cells. Herein, we report on an efficient dye-sensitized mesoporous photoanode of Ti doped zinc oxide (Ti-ZnO) through a facile hydrothermal method. The crystallinity, [...] Read more.
Photoanode materials with optimized particle sizes, excellent surface area and dye loading capability are preferred in good-performance dye sensitized solar cells. Herein, we report on an efficient dye-sensitized mesoporous photoanode of Ti doped zinc oxide (Ti-ZnO) through a facile hydrothermal method. The crystallinity, morphology, surface area, optical and electrochemical properties of the Ti-ZnO were investigated using X-ray photoelectron spectroscopy, transmission electron microscopy and X-ray diffraction. It was observed that Ti-ZnO nanoparticles with a high surface area of 131.85 m2 g−1 and a controlled band gap, exhibited considerably increased light harvesting efficiency, dye loading capability, and achieved comparable solar cell performance at a typical nanocrystalline ZnO photoanode. Full article
(This article belongs to the Special Issue Photocatalytic Organic Synthesis)
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Open AccessArticle 9,10-Phenanthrenedione as Visible-Light Photoredox Catalyst: A Green Methodology for the Functionalization of 3,4-Dihydro-1,4-Benzoxazin-2-Ones through a Friedel-Crafts Reaction
Catalysts 2018, 8(12), 653; https://doi.org/10.3390/catal8120653
Received: 12 November 2018 / Revised: 1 December 2018 / Accepted: 6 December 2018 / Published: 12 December 2018
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Abstract
A visible-light photoredox functionalization of 3,4-dihydro-1,4-benzoxazin-2-ones through a Friedel-Crafts reaction with indoles using an inexpensive organophotoredox catalyst is described. The reaction uses a dual catalytic system that is formed by a photocatalyst simple and cheap, 9,10-phenanthrenedione, and a Lewis acid, Zn(OTf)2. [...] Read more.
A visible-light photoredox functionalization of 3,4-dihydro-1,4-benzoxazin-2-ones through a Friedel-Crafts reaction with indoles using an inexpensive organophotoredox catalyst is described. The reaction uses a dual catalytic system that is formed by a photocatalyst simple and cheap, 9,10-phenanthrenedione, and a Lewis acid, Zn(OTf)2. 5W white LEDs are used as visible-light source and oxygen from air as a terminal oxidant, obtaining the corresponding products with good yields. The reaction can be extended to other electron-rich arenes. Our methodology represents one of the most valuable and sustainable approach for the functionalization of 3,4-dihydro-1,4-benzoxazin-2-ones, as compared to the reported procedures. Furthermore, several transformations were carried out, such as the synthesis of the natural product cephalandole A and a tryptophol derivative. Full article
(This article belongs to the Special Issue Photocatalytic Organic Synthesis)
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Open AccessArticle Surface Modification of TiO2 for Obtaining High Resistance against Poisoning during Photocatalytic Decomposition of Toluene
Catalysts 2018, 8(11), 500; https://doi.org/10.3390/catal8110500
Received: 6 October 2018 / Revised: 23 October 2018 / Accepted: 24 October 2018 / Published: 26 October 2018
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Abstract
Titanium oxide (TiO2) nanostructures, the most widely used photocatalysts, are known to suffer from poisoning of the active sites during photocatalytic decomposition of volatile organic compounds. Partially oxidized organic compounds with low volatility stick to the catalyst surface, limiting the practical [...] Read more.
Titanium oxide (TiO2) nanostructures, the most widely used photocatalysts, are known to suffer from poisoning of the active sites during photocatalytic decomposition of volatile organic compounds. Partially oxidized organic compounds with low volatility stick to the catalyst surface, limiting the practical application for air purification. In this work, we studied the UV-driven photocatalytic activity of bare TiO2 toward toluene decomposition under various conditions and found that surface deactivation is pronounced either under dry conditions or humid conditions with a very high toluene concentration (~442 ppm). In contrast, when the humidity was relatively high (~34 %RH) and toluene concentration was low (~66 ppm), such deactivation was not significant. We then modified TiO2 surfaces by deposition of polydimethylsiloxane and subsequent annealing, which yielded a more hydrophilic surface. We provide experimental evidence that our hydrophilic TiO2 does not show deactivation under the conditions that induce significant deactivation with bare TiO2. Conversion of toluene into dimethylacetamide was observed on the hydrophilic TiO2 and did not result in poisoning of active sites. Our hydrophilic TiO2 shows high potential for application in air purification for extended time, which is not possible using bare TiO2 due to the significant poisoning of active sites. Full article
(This article belongs to the Special Issue Photocatalytic Organic Synthesis)
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Graphical abstract

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