Conjugated Microporous Polymers as Molecular Sensing Devices: Microporous Architecture Enables Rapid Response and Enhances Sensitivity in Fluorescence-On and Fluorescence-Off Sensing,Journal of the American Chemical Society

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Conjugated Microporous Polymers as Molecular Sensing Devices: Microporous Architecture Enables Rapid Response and Enhances Sensitivity in Fluorescence-On and Fluorescence-Off Sensing
Journal of the American Chemical Society ( IF 14.4 ) Pub Date : 2012-05-18 , DOI: 10.1021/ja303448r
Xiaoming Liu ₁ , Yanhong Xu ₁ , Donglin Jiang ₁

Affiliation

Conjugated polymers are attractive materials for the detection of chemicals because of their remarkable π-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.

中文翻译：

共轭微孔聚合物作为分子传感装置：微孔结构可实现快速响应并提高荧光开启和荧光关闭传感的灵敏度

共轭聚合物因其显着的 π 共轭和光致发光特性而成为检测化学品的有吸引力的材料。在本文中，我们报告了一种构建具有共轭微孔聚合物 (CMP) 的分子检测系统的新策略。咔唑衍生物TCB的缩合导致了共轭微孔聚合物（TCB-CMP）的合成，该聚合物呈现蓝色发光并具有大表面积。与线性聚合物类似物相比，TCB-CMP 显示出更高的检测灵敏度，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显示出显着的荧光增强，在缺电子芳烃蒸气存在下显示出显着的荧光猝灭，并且可以在不损失敏感性和响应性的情况下重复使用。这些特性归因于材料的微孔共轭网络。具体而言，微孔将芳烃分子吸收到聚合物的密闭空间中，骨架具有大的表面积并为芳烃提供宽阔的界面，网络结构有利于激子在框架上的迁移。这些结构特征协同作用，增强了 TCB-CMP 在荧光开启和荧光关闭检测中的信号活性。骨架具有很大的表面积并为芳烃提供了广泛的接口，网络架构有利于激子在框架上的迁移。这些结构特征协同作用，增强了 TCB-CMP 在荧光开启和荧光关闭检测中的信号活性。骨架具有很大的表面积并为芳烃提供了广泛的接口，网络架构有利于激子在框架上的迁移。这些结构特征协同作用，增强了 TCB-CMP 在荧光开启和荧光关闭检测中的信号活性。

更新日期：2012-05-18

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