Article
Polymer Science
Frederic Dumur
Summary: Photopolymerization under visible light has made significant progress in recent years, thanks to the development of new irradiation setups based on LEDs. Efficient photoinitiating systems that match the light sources used in 3D printers have become increasingly important. However, visible light photoinitiators, although they increase the thickness of the polymerized films, are often strongly colored compounds that hinder the use of photopolymers for everyday applications. To tackle this issue, the development of photobleachable photoinitiating systems has emerged as a promising research field. This review provides an overview of recent advances in photobleachable photoinitiators and discusses the exploration of various structures to address the challenge of achieving colorless coatings.
EUROPEAN POLYMER JOURNAL
(2023)
Article
Polymer Science
Frederic Dumur
Summary: Photopolymerization under visible light is a highly researched field, especially in the context of 3D and 4D printing advancements. This perspective article highlights emerging trends in visible light photopolymerization for photocrosslinking applications. The focus has shifted towards simpler mono-component systems instead of complex multi-component photoinitiating systems, as well as reducing side-products, oxygen inhibition, and developing more eco-friendly polymerization processes using sunlight. The article also explores new trends in elongating polymer lifetime through processes like self-healing, and discusses the future vision of visible light photopolymerization for photocrosslinking applications.
EUROPEAN POLYMER JOURNAL
(2023)
Review
Polymer Science
Frederic Dumur
Summary: Visible light photopolymerization has gained renewed interest due to its application in 3D printing. New structures disconnected from traditional photoinitiators are being widely examined for developing visible light photoinitiating systems. The parameters such as excited state lifetimes, redox properties, and molar extinction coefficients of newly prepared photoinitiators need to be considered for efficient interaction with additives in photocurable resins. Thiophene, widely used in Organic Electronics, is a potential candidate for visible light photoinitiators due to its low oxidation potential and easy chemical modification. Different types of thiophene-based photoinitiators have been developed over the years. This review provides an overview of recent advances in thiophene-based photoinitiators and compares them with reference photoinitiating systems to highlight their significance.
EUROPEAN POLYMER JOURNAL
(2022)
Article
Polymer Science
Frederic Dumur
Summary: Photopolymerization is currently a focused area of research due to the need for visible light-activated photoinitiating systems. Pyrrole has been identified as an interesting scaffold for designing various dyes and developing new formulations with fast polymerization kinetics, high monomer conversions, low energy consumption, and activation in the visible range.
EUROPEAN POLYMER JOURNAL
(2022)
Article
Polymer Science
Frederic Dumur
Summary: This review provides an overview of the recent developments concerning phenothiazine-based photoinitiators of polymerization, highlighting the evolution and structural changes of these molecules within photoinitiators. By comparing with reference photoinitiating systems, the pertinence of this approach is demonstrated.
EUROPEAN POLYMER JOURNAL
(2022)
Article
Polymer Science
Frederic Dumur
Summary: This article provides a detailed review of the recent advances in benzylidene cyclopentanones, demonstrating a significant improvement in photoinitiating ability compared to their acyclic analogues.
EUROPEAN POLYMER JOURNAL
(2022)
Article
Chemistry, Physical
Janine Maier, Stefanie M. Mueller, Ana Torvisco, Gabriel Glotz, Roland C. Fischer, Thomas Griesser, Anne-Marie Kelterer, Michael Haas
Summary: Isolable stannenolates are new building blocks for effective Sn-based photoinitiators synthesis, and can be employed as synthons in main group chemistry. By reacting with electrophiles, they can form novel acylstannanes.
Article
Chemistry, Physical
Binghui Bao, Jian You, Dongxiao Li, Haitao Zhan, Luhang Zhang, Mingyang Li, Tao Wang
Summary: In this study, four novel double benzylidene ketone dyes were synthesized and demonstrated to have good charge transfer characteristics and high absorption capability. These dyes can be used as photoinitiators or charge transfer sensitizers to initiate photopolymerization under specific light sources. The experiments showed that the dyes with polyarylamine groups exhibited high sensitization and initiation activities under specific light sources.
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
(2022)
Article
Polymer Science
Mahmoud Rahal, Guillaume Noirbent, Bernadette Graff, Joumana Toufaily, Tayssir Hamieh, Didier Gigmes, Frederic Dumur, Jacques Lalevee
Summary: This study focuses on the investigation of two new copper complexes as visible light photoinitiators for free radical photopolymerization of acrylates, showing promising results in combination with iodonium salts and/or amines in multi-component photoinitiating systems.
Article
Chemistry, Applied
Mounir Maafi, Mohammed Ahmed Al-Qarni
Summary: Photochromes have potential applications based on their versatility and photobehavior; an integrated rate-law equation has been established for samples exposed to monochromatic light, but not yet for polychromatic light; c-DAE is a reliable actinometer for both monochromatic and polychromatic light in the visible range, serving as an exemplar for new generation actinometers.
Article
Polymer Science
Julie Kirschner, Alexandre Baralle, Julien Paillard, Bernadette Graff, Jean-Michel Becht, Joachim E. Klee, Jacques Lalevee
Summary: In recent years, there has been significant research in both academia and industry to find new classes of visible light photoinitiators. This article discusses the elegant report of a new Type I photoinitiator that generates silyl, germyl, or stannyl radicals, with the chemical mechanisms involving the cleavage of specific bonds. Additionally, the article explores the synthesis and light absorption properties of silyl glyoximides as new near-UV and blue light sensitive photoinitiators. The photochemical properties of these compounds are studied through various experiments and molecular modeling data, and their photoinitiating ability in specific monomer blends is examined.
MACROMOLECULAR CHEMISTRY AND PHYSICS
(2022)
Article
Chemistry, Physical
Tanja Wiesner, Gabriel Glotz, Odo Wunnicke, David Bleger, Ivana Knezevic, Ana Torvisco, Roland C. Fischer, Anne-Marie Kelterer, Georg Gescheidt, Michael Haas
Summary: In this study, we have developed a novel synthetic approach for the preparation of various bisacyldigermanes using the Corey-Seebach method. The synthesized compounds were characterized using NMR spectroscopy, mass spectrometry, and X-ray crystallography. UV/Vis absorption spectroscopy and DFT calculations were employed to analyze the absorption properties of the target compounds. Photolysis experiments and CIDNP spectra confirmed the radical pathway of the investigated compounds.
Article
Chemistry, Multidisciplinary
Jiali Fan, Qiancheng Wei, Ershu Zhu, Jing Gao, Xiamin Cheng, Yongna Lu, Teck-Peng Loh
Summary: A highly efficient and regioselective bromination of electron-rich arenes and heteroarenes has been developed using commercially available BrCCl3 as a Br source. The reaction, performed in air under mild conditions with Ru(bpy)(3)Cl-2·6H(2)O as a photocatalyst, avoids the use of strong acids and oxidants, yielding mono-brominated products with medium to excellent yields (up to 94%). This strategy exhibits good compatibility and high para-selectivity, facilitating complex syntheses.
CHEMICAL COMMUNICATIONS
(2021)
Article
Chemistry, Multidisciplinary
Hong Chen, Guillaume Noirbent, Shaohui Liu, Damien Brunel, Bernadette Graff, Didier Gigmes, Yijun Zhang, Ke Sun, Fabrice Morlet-Savary, Pu Xiao, Frederic Dumur, Jacques Lalevee
Summary: Four series of bis-chalcone compounds based on benzylpiperidinone, tetrahydrothiopyranone, pyridine or biphenyl central parts were designed and synthesized, showing potential as new near-UV/visible light sensitive photoinitiators for free radical photopolymerization and cationic photopolymerization. Among them, pyridine-based bis-chalcones proved to be the most efficient photoinitiators under 375 nm LED irradiation.
MATERIALS CHEMISTRY FRONTIERS
(2021)
Article
Polymer Science
Fatima Hammoud, Akram Hijazi, Sylvain Duval, Jacques Lalevee, Frederic Dumur
Summary: The article presents a series of compounds based on the 5,12-dihydroindolo[3,2-a]carbazole scaffold, where selective introduction of different functional groups on the two carbazole moieties was achieved by controlling reaction conditions. Experimental evidence showed higher reactivity of one of the carbazoles, leading to the generation of asymmetrically substituted structures.
EUROPEAN POLYMER JOURNAL
(2022)
Article
Chemistry, Multidisciplinary
Mohammed Boulhaoua, Ana Torvisco, Tibor Pasinszki
RESEARCH ON CHEMICAL INTERMEDIATES
(2020)
Article
Chemistry, Inorganic & Nuclear
Franz A. Mautner, Florian Bierbaumer, Marcell Gyurkac, Roland C. Fischer, Ana Torvisco, Salah S. Massoud, Ramon Vicente
Article
Chemistry, Inorganic & Nuclear
Andreas W. Kyri, Lukas Schuh, Andreas Knoechl, Michael Schalli, Ana Torvisco, Roland C. Fischer, Michael Haas, Harald Stueger
Article
Biochemistry & Molecular Biology
Franz A. Mautner, Roland C. Fischer, Ana Torvisco, Maher M. Henary, Febee R. Louka, Salah S. Massoud, Nahed M. H. Salem
Article
Chemistry, Inorganic & Nuclear
Tanja Wiesner, Mario Leypold, Anja Steinmaurer, Dominik Schnalzer, Roland C. Fischer, Ana Torvisco, Michael Haas
Article
Chemistry, Inorganic & Nuclear
Philipp Fruhwirt, Andreas Knoechl, Michael Pillinger, Stefanie M. Muller, Perry T. Wasdin, Roland C. Fischer, Judith Radebner, Ana Torvisco, Norbert Moszner, Anne-Marie Kelterer, Thomas Griesser, Georg Gescheidt, Michael Haas
INORGANIC CHEMISTRY
(2020)
Article
Crystallography
Franz A. Mautner, Patricia V. Jantscher, Roland C. Fischer, Ana Torvisco, Klaus Reichmann, Nahed M. H. Salem, Kenneth J. Gordon, Febee R. Louka, Salah S. Massoud
Summary: The synthesis and structural characterization of six dicyanamido-cadmium(II) complexes were reported, showing different dimensional structures and polymerization forms.
Article
Chemistry, Inorganic & Nuclear
Lukas Schuh, Philipp Mueller, Ana Torvisco, Harald Stueger, Tanja M. Wrodnigg, Michael Haas
Summary: A convenient synthetic method for obtaining D-galactose-substituted acylsilanes and acylgermanes is described. These compounds are easily accessible and their structural properties were analyzed using a combination of analytical methods. A D-galactose-substituted tetraacylgermane is proposed as a new interesting visible light photoinitiator based on its absorption properties and high solubility.
Article
Nanoscience & Nanotechnology
Efthymia Vakalopoulou, Thomas Rath, Marianne Kraeuter, Ana Torvisco, Roland C. Fischer, Birgit Kunert, Roland Resel, Hartmuth Schroettner, Anna Maria Coclite, Heinz Amenitsch, Gregor Trimmel
Summary: In this study, the length of the alkyl ligand was explored as an efficient tool to control the formation and nanoporosity of zinc sulfide thin films. It was found that the decomposition temperature of the metal xanthates, different growth regimes of the nanocrystals, and mesophase formation were mainly responsible for the changes in the structural properties and nanoporosity of the final ZnS films.
ACS APPLIED NANO MATERIALS
(2022)
Article
Chemistry, Inorganic & Nuclear
Lukas Schuh, Ana Torvisco, Michaela Flock, Christa Grogger, Harald Stueger
Summary: In this study, the synthesis and reactivity of acyl-substituted 1,4-disilacydohexa-2,5-dienes are reported. Photolysis of compounds 4 and 5 leads to 1,3-Si -> O migration reactions, generating 1,4-disilacyclohexadienes with exocyclic Si=C bonds. Surprisingly, the reaction of compound 4 with (KOBu)-Bu-t followed by the addition of PhMe2SiCl results in the formation of silylated 1,4-disilanorbornadiene cages. The mechanism for this reaction was elucidated through calculations and the isolation and characterization of intermediate products.
Article
Chemistry, Inorganic & Nuclear
Christa Grogger, Michaela Flock, Madeleine Heurix, Ana Torvisco, Andreas W. W. Kyri, Harald Stueger
Summary: This study reports the synthesis of a series of backbone silylated 1,3-dialkylimidazol-2-thiones. The developed synthesis protocol involves the silylation of N,N-dimethylimidazol-2-thione 1 followed by the addition of organochlorosilanes RnSiCl4-n (R=Me, Ph; n=0-4), enabling the synthesis of the C-silylated derivatives with monocyclic, silyl-bridged, or fused tricyclic structures. Reactivity studies have shown stable silicon-vinyl bonds and reactivity patterns similar to the unsilylated species. Combined UV-spectroscopic and computational studies indicate minimal impact of the silyl substituents on the electronic structure of the imidazol-2-thione ring.
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
(2023)
Article
Biochemistry & Molecular Biology
Salah S. Massoud, Febee R. Louka, Madison T. Dial, Nahed N. M. H. Salem, Roland C. Fischer, Ana Torvisco, Franz A. Mautner, Kai Nakashima, Makoto Handa, Masahiro Mikuriya
Summary: Three new tripod tetradentate phenolate-amines were synthesized and characterized, along with seven related published ligands. Various complexes with different structures were synthesized using these ligands and their molecular structures were determined. The magnetic susceptibility study revealed different antiferromagnetic coupling strengths in the complexes.
Article
Nanoscience & Nanotechnology
Matthias Mueller, Manfred Drusgala, Roland C. Fischer, Ana Torvisco, Wolfgang Kern, Michael Haas, Christine Bandl
Summary: Since the past few decades, surface-initiated photopolymerization techniques have gained increasing interest. Coupling of photoinitiators to surfaces and particles has become an important research topic in material and surface sciences. Covalent coupling of photoinitiators and subsequent photopolymerizations provide a wide range of surface properties.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Inorganic & Nuclear
Franz A. Mautner, Roland C. Fischer, Ana Torvisco, Nahed M. H. Salem, Amber R. Dugas, Shelby F. Aaron, Sushant P. Sahu, Febee R. Louka, Salah S. Massoud
Summary: Six pseudohalide zinc(II) complexes containing various N-donor auxiliary amines were structurally characterized. Most of the complexes exhibited luminescence emission in MeOH with red shift of emission maxima, and Complex 5 showed the strongest visible fluorescence peak at 421 nm (λex = 330 nm).
Article
Chemistry, Inorganic & Nuclear
Efthymia Vakalopoulou, Christine Buchmaier, Andreas Pein, Robert Saf, Roland C. Fischer, Ana Torvisco, Fernando Warchomicka, Thomas Rath, Gregor Trimmel
DALTON TRANSACTIONS
(2020)
Article
Polymer Science
Paige A. Shaw, Maxime Klausen, Mark Bradley
Summary: A light-responsive polymer capable of controlled release of camptothecin and generation of reactive oxygen species (ROS) was developed, which exhibited high cancer cell killing activity through both camptothecin release and ROS generation.
Article
Polymer Science
Donghui Zhang, Shiqi Liu, Zhihao Cai, Weizhe Luo, Guojian Liu, Runhui Liu
Summary: A straightforward and efficient method for synthesizing NPC monomers has been developed in this study, which enhances the availability of NPC monomers and facilitates the synthesis of polypeptides.
