Chalcone-derived oxime esters with efficient photoinitiation properties under LED irradiation  

作　　者：Qian Wu Mengda Xu Tianjiao Ma Shuzhen Yan Jin Li Xuesong Jiang 

机构地区：[1]School of Chemistry&Chemical Engineering,Frontiers Science Center for Transformative Molecules,State Key Laboratory for Metal Matrix Composite Materials,Shanghai Jiao Tong University,Shanghai 200240,China

出　　处：《Chinese Chemical Letters》2025年第3期463-468,共6页中国化学快报(英文版)

基　　金：National Nature Science Foundation of China(Nos.52025032,52103144 and 523B2026)for their financial support;supported by the Postdoctoral Fellowship Program of China Postdoctoral Science Foundation(No.GZC20231544)。

摘　　要：As one of the most essential components in photocuring system,photoinitiators(PIs)exert a crucial influence on the properties of the cured product.However,commercially available PIs encounter challenges in simultaneously achieving efficient photoinitiation performance and excellent light absorption properties,significantly limiting their applications in various fields.Here,two bis-chalcones and four corresponding oxime esters(OXEs)were designed and synthesized as highly efficient PIs.Featuring a structure comprising bis-chalcone and two diphenyl sulfides,the conjugated systems in these compounds enhance their light-absorption properties in near-ultraviolet and visible region,effectively.Both the frontier molecular orbital simulations and excited state calculations suggest the contribution of sulfur atoms to electron delocalization and the formation of conjugated structure.Due to the high reactivity of the N–O bond in OXE moiety,the four OXEs exhibit exceptional free radical photoinitiating ability in commercial acrylic monomers/oligomers with LED@365nm as light source.Notably,one of them demonstrates superior performance in the photoinitiation of multifunctional crosslinker,achieving more than 70%conversion within 3 s,coupled with outstanding absorption at 365 nm.These chalcone-based OXEs are considered to exert significant potential in the realm of free radical photocuring.

关 键 词：PHOTOPOLYMERIZATION PHOTOINITIATOR CHALCONE Oxime ester Free radical polymerization 

分 类 号：O621[理学—有机化学] O62[理学—化学]