Three pyrrolo[3, 2-b]pyrrole compounds (Py-CF 3 -H, Py-CF 3 -CH 3 and Py-CF 3 -OCH 3) were prepared as radical photoinitiators for visible light radical photopolymerization. Radical photopolymerization using the Py-CF 3 -H initiator-induced TMPTA system achieved a peak conversion rate of 72% for C=C double bonds. The effect of changes in the electronic structure on the photoinitiation ability of the three photoinitiators was studied using spectroscopic measurements and theoretical calculations. The generated free radicals were detected using electron paramagnetic resonance (EPR). The synthesized photoinitiators matched the 405 nm LED. Under steady photolysis at 405 nm, the maximum absorption peaks decreased rapidly after exposure to light, and a new blue-shifted peak appeared. The end groups on the phenyl at 1,4 positions of the pyrrolo[3,2-b]pyrrole core considerably influenced the charge surrounding the central core, according to the electrostatic potential (ESP) results. The -H on 1,4-phenyl provides a less negative charge on the fused pyrrole core compared to the -CH 3 and -OCH 3 . Thus, this work provides an experimental foundation for investigating pyrrole-based photoinitiators in polymer curing.

Yuhao Gao

Lei Wang

Yuqin Zhu

Yunzhou Chen

Weixiao Zhang

Yu Chen

Research on Chemical Intermediates

RESEARCH ON CHEMICAL INTERMEDIATES 发表最新的研究文章和关于化学各个领域中间物质的性质、结构和反应性的简明动态评论。该杂志还包含相关学科的文章，如光谱学、分子生物学和生物化学、大气和环境科学、催化、光化学和光物理学。此外，定期出版专门针对该领域特定主题的特刊。

Research on Chemical Intermediates publishes the latest research articles and concise dynamic reviews on the properties, structures, and reactivities of chemical intermediates across various fields of chemistry. The journal also includes articles from related disciplines such as spectroscopy, molecular biology, biochemistry, atmospheric and environmental sciences, catalysis, photochemistry, and photophysics. Additionally, it regularly publishes special issues focused on specific topics within the field.

《Research on Chemical Intermediates》发表最新的研究文章，涵盖化学领域中间物质的性质、结构和反应性的动态评论。该杂志还包括相关学科的文章，如光谱学、分子生物学、生物化学、大气与环境科学、催化、光化学和光物理学。此外，定期出版专门针对该领域特定主题的特刊。

Category	Quartile
化学	3
化学, 化学综合	3

Trifluoromethyl-substituted pyrrolo[3,2-b]pyrrole derivatives for visible light photopolymerization

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Journal Info

Category	Quartile
CHEMISTRY, MULTIDISCIPLINARY	2