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Photoactivation of Aggregation-Induced Emission Molecules for Fast and Efficient Synthesis of Highly Fluorescent Single-Chain Nanoparticles.
ACS Omega ( IF 3.7 ) Pub Date : 2018-11-09 , DOI: 10.1021/acsomega.8b02374
Julen De-La-Cuesta 1 , José A Pomposo 1, 2, 3
Affiliation  

Single-chain nanoparticles (SCNPs) are ultrasmall soft nanomaterials constructed via intrachain cross-linking of individual precursor polymer chains, with promising prospects for nanomedicine, catalysis, and sensing, among other different fields. SCNPs are versatile building blocks for the construction of new fluorescent probes with ultrasmall size, higher brightness, and better photostability than previous particle-based systems. Herein, we report on a new, fast, and efficient method to produce SCNPs with intense fluorescence emission in solution which is based on the photoactivation of appropriate aggregation-induced emission (AIE) cross-linking molecules containing azide functional groups. Remarkably, the presence of the azide moiety-that can be transformed to highly reactive nitrene species upon UV irradiation-was found to be essential for the SCNPs to display intense fluorescence emission. We attribute the fluorescence properties of the SCNPs to the immobilization of the initially nonfluorescent AIE molecules via intrachain cross-linking upon photoactivation. Such cross-linking-induced immobilization process activates the AIE mechanism and, hence, leads to fluorescent SCNPs in both solution and solid state.

中文翻译:


聚集诱导发射分子的光活化,用于快速有效地合成高荧光单链纳米颗粒。



单链纳米粒子(SCNP)是通过单个前体聚合物链的链内交联构建的超小型软纳米材料,在纳米医学、催化和传感等不同领域具有广阔的前景。 SCNP 是用于构建新型荧光探针的多功能构建块,与以前的基于颗粒的系统相比,该探针具有超小尺寸、更高的亮度和更好的光稳定性。在此,我们报告了一种新的、快速且有效的方法来生产在溶液中具有强烈荧光发射的 SCNP,该方法基于含有叠氮官能团的适当聚集诱导发射(AIE)交联分子的光活化。值得注意的是,叠氮部分的存在(在紫外线照射下可转化为高反应性氮宾物种)被发现对于 SCNP 显示强烈的荧光发射至关重要。我们将 SCNP 的荧光特性归因于通过光活化时的链内交联固定最初的非荧光 AIE 分子。这种交联诱导的固定过程激活了 AIE 机制,从而产生溶液和固态的荧光 SCNP。
更新日期:2018-11-09
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