Conjugated Microporous Polymers as Molecular Sensing Devices: Microporous Architecture Enables Rapid Response and Enhances Sensitivity in Fluorescence-On and Fluorescence-Off Sensing
Conjugated Microporous Polymers as Molecular Sensing Devices: Microporous Architecture Enables Rapid Response and Enhances Sensitivity in Fluorescence-On and Fluorescence-Off Sensing
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DOI：
10.1021/ja303445r
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发表时间：
2012-05-30
影响因子：
15
通讯作者：
Jiang, Donglin
中科院分区：
文献类型：
--
作者：
Liu, Xiaoming;Xu, Yanhong;Jiang, Donglin
共轭聚合物由于具有良好的π共轭性和光致发光特性，成为化学物质检测的重要材料。在这篇文章中，我们报告了一种新的策略，用于构建分子检测系统的共轭微孔聚合物（CMP）。通过咔唑衍生物TCB的缩合反应，合成了一种具有大比表面积的共轭微孔聚合物（TCB-CMP）。与线性聚合物类似物相比，TCB-CMP显示出增强的检测灵敏度，并允许在暴露于其蒸气时快速检测芳烃。TCB-CMP在富电子芳烃蒸气存在下表现出显著的荧光增强，在缺电子芳烃蒸气存在下表现出剧烈的荧光猝灭，并且可以重复使用而不损失灵敏度和响应性。这些特性归因于材料的微孔共轭网络。具体地说，微孔吸收芳烃分子进入聚合物的有限空间，骨架具有大的表面积，并提供了一个广泛的界面芳烃，和网络架构促进激子迁移的框架。这些结构特征协同作用，增强TCB-CMP在荧光开启和荧光关闭检测中的信号传导活性。
Conjugated polymers are attractive materials for the detection of chemicals because of their remarkable pi-conjugation and photoluminescence properties. In this article, we report a new strategy for the construction of molecular detection systems with conjugated microporous polymers (CMPs). The condensation of a carbazole derivative, TCB, leads to the synthesis of a conjugated microporous polymer (TCB-CMP) that exhibits blue luminescence and possesses a large surface area. Compared with a linear polymer analogue, TCB-CMP showed enhanced detection sensitivity and allowed for the rapid detection of arenes upon exposure to their vapors. TCB-CMP displayed prominent fluorescence enhancement in the presence of electron-rich arene vapors and drastic fluorescence quenching in the presence of electron-deficient arene vapors, and it could be reused without a loss of sensitivity and responsiveness. These characteristics are attributed to the microporous conjugated network of the material. Specifically, the micropores absorb arene molecules into the confined space of the polymer, the skeleton possesses a large surface area and provides a broad interface for arenes, and the network architecture facilitates exciton migration over the framework. These structural features function cooperatively, enhancing the signaling activity of TCB-CMP in fluorescence-on and fluorescence-off detection.