Phenothiazine derivatives based on double benzylidene ketone structure: Application to red light photopolymerization

Two novel phenothiazine derivatives PTZs (PTZ-H and PTZ-C) with D-A configuration based on double benzylidene ketone structure were synthesized and showed good charge transfer capability. The absorption wavelength of PTZ-C formed by introducing aryl groups to both sides of PTZ-H can reach more than...

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Bibliographic Details
Published in:Progress in organic coatings 2022-12, Vol.173, p.107217, Article 107217
Main Authors: Li, Mingyang, Bao, Binghui, You, Jian, Du, Yao, Li, Dongxiao, Zhan, Haitao, Zhang, Luhang, Wang, Tao
Format: Article
Language:English
Subjects:
Absorption
Charge transfer
Double benzylidene ketone
Free radicals
Ketones
Light sources
Photochemical reactions
Photolysis
Photopolymerization
Photosensitizer
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Summary:Two novel phenothiazine derivatives PTZs (PTZ-H and PTZ-C) with D-A configuration based on double benzylidene ketone structure were synthesized and showed good charge transfer capability. The absorption wavelength of PTZ-C formed by introducing aryl groups to both sides of PTZ-H can reach more than 620 nm. In photopolymerization, PTZ-C performed better than PTZ-H as a photosensitizer to sensitize iodonium salt (ONI) to initiate free radical photopolymerization (FRP) and cationic photopolymerization (CP) under 532 and 620 nm LED light source. The photochemical reaction processes between PTZs and ONI were studied by means of steady-state photolysis, UV–vis absorption, cyclic voltammetry (CV), and fluorescence quenching experiments. [Display omitted] •Two double benzylidene ketones based on phenothiazine groups were synthesized.•Double benzylidene ketones exhibit efficient activities in red LED photopolymerization.•Absorption wavelength of PTZ-C can reach more than 620 nm.
ISSN:0300-9440
1873-331X
DOI:10.1016/j.porgcoat.2022.107217