Three naphthalimide aryl benzyl sulfide derivatives (NABSs) cleavable photoinitiators (PIs) containing benzyl-sulfur bonds were designed and prepared. The effect of the benzyl-sulfur moiety and substituents located on benzene ring of the benzyl group on photochemical behavior, involving the light absorption properties, potential mechanisms of the photolysis of NABSs under UV LED at 405 nm, and the electron transfer reaction between NABSs and diphenyliodonium hexafluorophosphate (Iod) were investigated in detail. The NABSs have different photolysis mechanisms as compared to PIs containing only an aryl-sulfur bond. NABS3 is most efficient for initiating free radical photopolymerization of acrylate monomers under UV LED exposure at 405 nm. Furthermore, NABSs/Iod systems can initiate the cationic photopolymerization of epoxides. Interestingly, the polymers prepared by using NABSs as the PI exhibit a great photoluminescence band at about 460 nm under UV LED irradiation at 405 nm. GRAPHICAL ABSTRACT

中文翻译：

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含有苄基硫键的萘酰亚胺衍生物作为可裂解光引发剂用于近紫外 LED 聚合

设计并制备了三种含有苄硫键的萘酰亚胺芳基苄硫衍生物 (NABS) 可裂解光引发剂 (PI)。苄基苯环上的苄基硫部分和取代基对光化学行为的影响，涉及光吸收特性、NABSs 在 405 nm UV LED 下光解的潜在机制，以及 NABSs 和 NABSs 之间的电子转移反应。六氟磷酸二苯基碘鎓 (Iod) 进行了详细研究。与仅包含芳基硫键的 PI 相比，NABS 具有不同的光解机制。NABS3 在 405 nm 的 UV LED 曝光下最有效地引发丙烯酸酯单体的自由基光聚合。此外，NABSs/Iod 系统可以引发环氧化物的阳离子光聚合。有趣的是，使用 NABSs 作为 PI 制备的聚合物在 405 nm 的 UV LED 照射下在约 460 nm 处表现出很大的光致发光带。图形概要