Photoactivatable turn-on fluorescence based on the photo-cleavage of the C–Br bond in 1,2-bis(5-(bromoethyl)benzoxazol-2-yl)ethane
作者:Yongchao Hao、Xian-Zi Dong、Yi Chen
DOI:10.1039/c4nj00365a
日期:——
This paper describes photoactivatable turn-on fluorescence based on the photo-cleavage of the CâBr bond in 1,2-bis(5-(bromoethyl)benzoxazol-2-yl)ethane (1) in both solution and in a polymeric thin film. It was found that 1 exhibited very weak fluorescence in both solution and in a PMMA thin film, upon irradiation with 365 nm light, a strong fluorescence was detected. The strong fluorescence attributed to the photo-product resulted from the photo-induced cleavage of the CâBr bond in 1. Moreover, it was also found that the photo-cleavage of the CâBr bond in 1 can be performed using a two-photon induced process, and upon irradiation on a 1-PMMA thin film with a 780 nm femtosecond laser, finely resolved fluorescence images are obtained.
本文介绍了基于 1,2-双(5-(溴乙基)苯并恶唑-2-基)乙烷(1)中 CâBr 键在溶液和聚合物薄膜中的光裂解作用而产生的光激活开启荧光。研究发现,1 在溶液和聚甲基丙烯酸甲酯(PMMA)薄膜中均表现出非常微弱的荧光,而在 365 纳米光照射下,则可检测到强烈的荧光。此外,研究还发现,1 中 CâBr 键的光裂解可通过双光子诱导过程进行,用 780 纳米飞秒激光照射 1-PMMA 薄膜时,可获得精细分辨的荧光图像。