Special Issue "Recent Advances in Photoredox Catalysts"

A special issue of Catalysts (ISSN 2073-4344).

Deadline for manuscript submissions: 30 June 2020.

Special Issue Editors

Guest Editor
Dr. Frédéric Dumur Website 1 Website 2 E-Mail
Aix-Marseille University, Marseille, France
Interests: photoredox catalysts, organocatalysts and metal complexes as photoinitiators of polymerization, photopolymerization; luminescent materials; organic and organometallic chemistry
Guest Editor
Prof. Dr. Jacques Lalevee Website E-Mail
Universite de Haute-Alsace (UHA), Centre National de la Recherche Scientifique (CNRS), UMR 7361, IS2M, 15 Rue Jean Starcky, F-68057 Mulhouse, France
Interests: photopolymerization; photochemistry; polymers & lights; photoinitiators; 3D printing (stereolithography)

Special Issue Information

Dear Colleagues,

With the emphasis on resource and energy conservation as well as environmental issues, there has been a move towards chemical processes that can be carried out under safer conditions. These issues can be addressed by photoredox catalysis. While photoredox catalysis was initially developed for organic chemistry, this unprecedented approach is now being applied to various research fields, ranging from the synthesis of polymers to water depollution or the functionalization of metal surfaces, etc. Using this approach, a drastic reduction of catalyst content could be achieved, resulting from the possibility of regenerating the latter in situ.

Researchers in the field are cordially invited to submit relevant manuscripts concerning the development of new photoredox catalysts for a Special Issue entitled ‘Recent Advances in Photoredox Catalysts’, within the journal Catalysts. Perspectives and reviews in this active research field are also welcome.

Dr. Frédéric Dumur
Prof. Dr. Jacques Lalevée
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 papers will be 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. Catalysts is an international peer-reviewed open access monthly 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 1600 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

  • photoredox catalysts
  • organocatalysts
  • metal complexes

Published Papers (1 paper)

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Research

Open AccessArticle
New 1,8-Naphthalimide Derivatives as Photoinitiators for Free-Radical Polymerization Upon Visible Light
Catalysts 2019, 9(8), 637; https://doi.org/10.3390/catal9080637 - 26 Jul 2019
Abstract
Photopolymerization processes, and especially those carried out under visible light, are more and more widespread for their multiple advantages compared to thermal processes. In the present paper, new 1,8-naphthalimide derivatives are proposed as photoinitiators for free-radical polymerization upon visible light exposure using light-emitting [...] Read more.
Photopolymerization processes, and especially those carried out under visible light, are more and more widespread for their multiple advantages compared to thermal processes. In the present paper, new 1,8-naphthalimide derivatives are proposed as photoinitiators for free-radical polymerization upon visible light exposure using light-emitting diodes (LEDs) at 395, 405, and 470 nm. These photoinitiators are used in combination with both iodonium salts and phosphine. The synthesis of these compounds as well as their excellent polymerization initiation ability for methacrylate monomers are presented in this article. A full picture of the involved chemical mechanisms is also provided thanks to photolysis, radical characterization, and redox measurements. Full article
(This article belongs to the Special Issue Recent Advances in Photoredox Catalysts)
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Planned Papers

The below list represents only planned manuscripts. Some of these manuscripts have not been received by the Editorial Office yet. Papers submitted to MDPI journals are subject to peer-review.

Title: Biphenyls derivatives for photoinitiating systems dedicated for versatile photoredox processes induced polymerizations reactions
Authors:Ortyl J.1, Tomal W.1, Chachaj-Brekiesz A. 2, Pilch M. 1
Affiliation: 1Cracow University of Technology, Faculty of Chemical Engineering and Technology,  Warszawska 24, 31-155 Cracow, Poland *[email protected]
2 Jagiellonian University, Faculty of Chemistry, Gronostajowa 2, 30-387 Cracow, Poland
Abstract: In this article, novel biphenyl derivatives were proposed for a highly effective two component photoinitiating system upon ultraviolet UV-A and visible light exposure using LEDs @365 nm and @405 nm and evaluated in terms of photoredox processes. Remarkably, these structures perform exceptional initiating abilities for: the cationic photopolymerization of epoxides (CP) and  the free radical photopolymerization of acrylic (FRP). They were also investigated for the role in the preparation of interpenetrating polymer networks (IPNs) of (3,4-Epoxycyclohexane)methyl-3,4 epoxycyclo-hexylcarboxylate (EPOX) and trimethylolpropanetriacrylate (TMPTA). Excellent polymerization profiles for all of the monomers, along with high final conversions where obtained. The photoinitiation mechanism of these bimolecular system based on 2-(diethylamino)-4-methyl-6-phenyl-benzene-1,3-dicarbonitrile derivatives and onium salts  were investigated using the real time FT-IR technique, steady state photolysis, cyclic voltammetry and luminescence experiments. The discussion of the role of substitution effect in the structure of investigated biphenyl derivatives is also included.

Title: Water-soluble dual-purpose polymeric (photo)initiator: Dark curing of acrylates and/or visible light curing of methacrylates
Authors: Tugce Nur Eren1, Jacques Lalevee2, Duygu Avci1
Affiliation:1Department of Chemistry, Bogazici University, 34342 Bebek, Istanbul, Turkey
2Institut de Science des Matériaux de Mulhouse IS2M, UMR CNRS 7361, UHA, 15, rue Jean Starcky, 68057 Mulhouse Cedex, France
Abstract: A novel water soluble polymeric (photo)initiator (PAATX) was synthesized from the aza-Michael addition reaction of a poly(amido amine) (prepared from the reactions of 1,4-butanediamine with methylene bisacrylamide) to 9-oxo-9H-thioxanthen-2-yl acrylate. Because of steric effects, the thioxanthone (TX) moiety is attached to only approx. 20% of the secondary amine sites on the polymer backbone. This initiator can be used in multi-step curing systems involving aza-Michael addition between acrylates and the remaining backbone amines in the presence of a methacrylate; and visible light curing of methacrylates due to the TX moiety.  Polymerization properties of PAATX with and without light are investigated. PAATX has an absorption maximum in the near UV-Visible region ( ̴ 400 nm). Steady state photolysis results show that PAATX/ bis-(4-tert-butylphenyl)-iodonium hexafluorophosphate (Iod) system has the highest photolysis rate which signifies that PAATX forms radicals more efficiently by a photooxidation mechanism. LFP experiments prove that PAATX has a singlet state reactivity.

Title: Thioxanthone derivatives as a versatile photoinitiators/photoredox catalysts for polymerization processes under visible light.
Authors: Hola E.1, Pilch M.1, Ortyl J.1*
Affiliation:1Cracow University of Technology, Faculty of Chemical Engineering and Technology,  Warszawska 24, 31-155 Cracow, Poland
Abstract: In the present paper, novel thioxanthone based compounds were synthesized and evaluated as a components of photoredox catalysts/ photoinitiating systems for the free radical polymerization (FRP) of acrylates and cationic polymerization (CP) of epoxy monomers. The performance of obtained thioxanthones in combination with an amine or/ and an iodonium salt for photopolymerization processes upon exposure to the light emitting diodes (LEDs) 405nm, 420nm and 470nm was studied. Fourier transform real-time infrared spectroscopy was used to monitor the kinetics of disappearance of the functional groups of the monomers during photoinitiated polymerization. Excellent photoinitiating efficiency is found and high final conversions of functional groups are observed. The influence of thioxanthone skeleton substitution of photoinitiating efficiency was discussed. The photochemical mechanism was also investigated through steady-state photolysis, cyclic voltammetry and fluorescence experiments. It has been discovered that thioxanthone derivatives can be used as a metal-free photoredox catalyst active both oxidative and reductive cycles.

 

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