Near-IR two-photon absorption photostabilizers for polymers intensified by molecular assembly in mixed organic solvents/H2O
作者:Yueting Shi、Xiaozhuan Qin、Gang Li、Hongru Li、Ge Ding、Xiaohong Liu、Fang Gao
DOI:10.1016/j.molliq.2021.117590
日期:2021.12
phenanthridine dyes carrying hydroxy groups that were employed as near-IR two-photon absorption (TPA) photostabilizers for polymers. It was demonstrated that the target phenanthridine dyes underwent reversible excited state proton transfer (ESPT) in strong polar protic and aprotic solvents, such as ethanol, which was more remarkable under near-IR two-photon excitation. It was determined that the target dyes
该研究报告了各种带有羟基的目标菲啶染料,这些染料被用作聚合物的近红外双光子吸收 (TPA) 光稳定剂。结果表明,目标菲啶染料在强极性质子和非质子溶剂(如乙醇)中经历了可逆激发态质子转移(ESPT),这在近红外双光子激发下更为显着。确定目标染料在混合有机溶剂/H 2 O 溶剂(如乙醇/H 2O,90% 的水体积)。目标菲啶染料的有序分子聚集分别增强了单光子和近红外双光子激发下的可逆 ESPT 发射。因此,目标染料的可逆 ESPT 过程消耗了吸收的能量。因此,目标染料被评估为聚合物的近红外 TPA 光稳定剂。相比之下,缺乏羟基的参考菲啶染料在光照射下没有表现出 ESPT 或光稳定性。