A New Anthraquinone Derivative as Near UV and Visible Light Photoinitiator for Free-Radical, Thiol-ene and Cationic Polymerizations

2021 ◽  
Author(s):  
Yi Zhu ◽  
Junyi Pi ◽  
Yuchao Zhang ◽  
Dandan Xu ◽  
Yusuf Yagci ◽  
...  
Keyword(s):  
Free Radical ◽  
Visible Light ◽  
Photophysical Properties ◽  
Anthraquinone Derivative ◽  
Cationic Polymerizations

A new UV and visible light photoinitiator, quinizarin derivative 6,11-dimethoxy-7,10-dihydrotetracene-5,12-dione (Q4) was synthesized and characterized. Photophysical properties were evaluated by various spectroscopic and computational investigations. Q4 demonstrates excellent initiating efficiency...

Design, Synthesis and Use of Phthalocyanines as a New Class of Visible-Light Photoinitiators for Free-Radical and Cationic Polymerizations

2021 ◽  
Author(s):  
Davy-Louis Versace ◽  
Louise Breloy ◽  
Yusuf Yagci ◽  
Ismail Yilmaz ◽  
Ozgur Yavuz
Keyword(s):  
Free Radical ◽  
Visible Light ◽  
Design Synthesis ◽  
New Class ◽  
Optical Stability ◽  
Cationic Polymerizations

Phthalocyanines (Pcs) are interesting molecules offering a fascinating chemistry world which received tremendous interest in the last decade. Their certain features such as high thermal, chemical, and optical stability as...

scholarly journals Panchromatic Copper Complexes for Visible Light Photopolymerization

Photochem ◽  
2021 ◽  
Vol 1 (2) ◽  
pp. 167-189
Author(s):  
Alexandre Mau ◽  
Guillaume Noirbent ◽  
Céline Dietlin ◽  
Bernadette Graff ◽  
Didier Gigmes ◽  
...  
Keyword(s):  
Free Radical ◽  
Visible Light ◽  
Radical Polymerization ◽  
Copper Complexes ◽  
Free Radical Polymerization ◽  
Photoluminescence Properties ◽  
System Formation ◽  
Iodonium Salt ◽  
Visible Light Photopolymerization ◽  
Cationic Polymerizations

In this work, eleven heteroleptic copper complexes were designed and studied as photoinitiators of polymerization in three-component photoinitiating systems in combination with an iodonium salt and an amine. Notably, ten of them exhibited panchromatic behavior and could be used for long wavelengths. Ferrocene-free copper complexes were capable of efficiently initiating both the radical and cationic polymerizations and exhibited similar performances to that of the benchmark G1 system. Formation of acrylate/epoxy IPNs was also successfully performed even upon irradiation at 455 nm or at 530 nm. Interestingly, all copper complexes containing the 1,1′-bis(diphenylphosphino)ferrocene ligand were not photoluminescent, evidencing that ferrocene could efficiently quench the photoluminescence properties of copper complexes. Besides, these ferrocene-based complexes were capable of efficiently initiating free radical polymerization processes. The ferrocene moiety introduced in the different copper complexes affected neither their panchromatic behaviors nor their abilities to initiate free radical polymerizations.

Visible Light Anthraquinone Functional Phthalocyanine Photoinitiator for Free-Radical and Cationic Polymerizations

2019 ◽  
Vol 53 (1) ◽  
pp. 112-124 ◽  
Author(s):  
Louise Breloy ◽  
Vlasta Brezová ◽  
Agata Blacha-Grzechnik ◽  
Marc Presset ◽  
Mustafa Semih Yildirim ◽  
...  
Keyword(s):  
Free Radical ◽  
Visible Light ◽  
Cationic Polymerizations

Microporous Thioxanthone Polymers as Heterogeneous Photoinitiators for Visible Light Induced Free Radical and Cationic Polymerizations

2014 ◽  
Vol 47 (14) ◽  
pp. 4607-4614 ◽  
Author(s):  
Sajjad Dadashi-Silab ◽  
Hakan Bildirir ◽  
Robert Dawson ◽  
Arne Thomas ◽  
Yusuf Yagci
Keyword(s):  
Free Radical ◽  
Visible Light ◽  
Cationic Polymerizations

scholarly journals Fluorinated azobenzenes as supramolecular halogen-bonding building blocks

2019 ◽  
Vol 15 ◽  
pp. 2013-2019 ◽  
Author(s):  
Esther Nieland ◽  
Oliver Weingart ◽  
Bernd M Schmidt
Keyword(s):  
Solid State ◽  
Dft Calculations ◽  
Visible Light ◽  
Half Life ◽  
Photophysical Properties ◽  
Bathochromic Shift ◽  
Halogen Bonding ◽  
Building Blocks ◽  
Partial Overlap

ortho-Fluoroazobenzenes are a remarkable example of bistable photoswitches, addressable by visible light. Symmetrical, highly fluorinated azobenzenes bearing an iodine substituent in para-position were shown to be suitable supramolecular building blocks both in solution and in the solid state in combination with neutral halogen bonding acceptors, such as lutidines. Therefore, we investigate the photochemistry of a series of azobenzene photoswitches. Upon introduction of iodoethynyl groups, the halogen bonding donor properties are significantly strengthened in solution. However, the bathochromic shift of the π→π* band leads to a partial overlap with the n→π* band, making it slightly more difficult to address. The introduction of iodine substituents is furthermore accompanied with a diminishing thermal half-life. A series of three azobenzenes with different halogen bonding donor properties are discussed in relation to their changing photophysical properties, rationalized by DFT calculations.

scholarly journals Free Radical Chemistry Enabled by Visible Light-Induced Electron Transfer

2016 ◽  
Vol 49 (10) ◽  
pp. 2295-2306 ◽  
Author(s):  
Daryl Staveness ◽  
Irene Bosque ◽  
Corey R. J. Stephenson
Keyword(s):  
Electron Transfer ◽  
Free Radical ◽  
Visible Light ◽  
Radical Chemistry ◽  
Free Radical Chemistry

A Visible Light Initiating System for Free Radical Promoted Cationic Polymerization

1994 ◽  
Vol 27 (14) ◽  
pp. 3683-3693 ◽  
Author(s):  
Yubai Bi ◽  
Douglas C. Neckers
Keyword(s):  
Free Radical ◽  
Visible Light ◽  
Cationic Polymerization
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