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Squarylium-triazine dyad as a highly sensitive photoradical generator for red light
Koichi Kawamura1, Julien Schmitt, Maxime Barnet
1Laboratory of Macromolecular Photochemistry and Engineering, University of Haute Alsace, 3b, rue Alfred Werner, 68093 Mulhouse (France). koichi.kawamura@uha.fr.
Chemistry (Weinheim an Der Bergstrasse, Germany)
|August 7, 2013
Summary
New squarylium-triazine compounds generate radicals efficiently under red light. This photoradical generation shows a strong correlation between electron transfer rates and polymerization efficiency.
Area of Science:
- Organic Chemistry
- Photochemistry
- Polymer Science
Background:
- Development of efficient photoradical generators is crucial for initiating polymerization.
- Red-light-triggered processes offer advantages due to deeper tissue penetration and reduced photodamage.
Purpose of the Study:
- To synthesize and characterize novel squarylium-triazine dyads.
- To investigate their intramolecular photodissociative electron-transfer reaction for red-light photoradical generation.
- To compare their efficiency with unlinked systems in initiating free radical polymerization.
Main Methods:
- Synthesis of squarylium-triazine dyads and unlinked systems.
- Determination of electron transfer rate constants.
- Measurement of maximum rates of free radical polymerization of acrylates in film.
Main Results:
- The synthesized dyads exhibit intramolecular photodissociative electron transfer.
- Efficient red-light photoradical generation was achieved.
- A strong correlation was observed between the rate of electron transfer and the rate of polymerization.
Conclusions:
- The novel squarylium-triazine dyads are effective red-light photoradical generators.
- This approach offers an efficient method for initiating polymerization using red light.
- The findings highlight the potential of these dyads in applications requiring light-triggered radical generation.
