Light-Emitting Covalent Organic Frameworks: Fluorescence Improving via Pinpoint Surgery and Selective Switch-On Sensing of Anions,Journal of the American Chemical Society

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Light-Emitting Covalent Organic Frameworks: Fluorescence Improving via Pinpoint Surgery and Selective Switch-On Sensing of Anions
Journal of the American Chemical Society ( IF 14.4 ) Pub Date : 2018-09-18 , DOI: 10.1021/jacs.8b08380
Zhongping Li _{1,

2} , Ning Huang ₁ , Ka Hung Lee _{3,

4} , Yu Feng ₁ , Shanshan Tao ₁ , Qiuhong Jiang ₁ , Yuki Nagao ₂ , Stephan Irle ₃ , Donglin Jiang ₁

Affiliation

Covalent organic frameworks (COFs) offer ordered π structures that are useful for developing light-emitting materials. However, most COFs are weak in luminescence. Here we report the conversion of less emissive COFs into light-emitting materials via a pinpoint surgery on the pore walls. Deprotonation of the N-H bond to form an anionic nitrogen species in the hydrazone linkage can eliminate the nitrogen-related fluorescence quenching pathway. The resulting COF enhances the fluorescence in a linear proportion to the progress of deprotonation, achieving a 3.8-fold improved emission. This pinpoint N-H cleavage on the pore walls can be driven only by the fluoride anion while other halogen anions, including chloride, bromide, and iodide, remain inactive, enabling the selective fluorescence switch-on sensing of the fluoride anion at a ppb level.

中文翻译：

发光共价有机框架：通过精确手术和阴离子的选择性开启感应改善荧光

共价有机框架 (COF) 提供有序的 π 结构，可用于开发发光材料。然而，大多数COFs的发光很弱。在这里，我们报告了通过孔壁上的精确手术将发射率较低的 COF 转化为发光材料。NH 键的去质子化以在腙键中形成阴离子氮物质可以消除与氮相关的荧光猝灭途径。由此产生的 COF 以与去质子化进程成线性比例的方式增强荧光，实现 3.8 倍的改进发射。孔壁上的这种精确的 NH 裂解只能由氟阴离子驱动，而其他卤素阴离子，包括氯离子、溴离子和碘离子，仍然处于非活性状态，从而能够在 ppb 级对氟阴离子进行选择性荧光开启感应。

更新日期：2018-09-18

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