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Designing Fluorescent Covalent Organic Frameworks by Controlling Layer Spacing, Size of Aromatic Linker and Side Chains for Detection of Nitrofurazone
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2023-03-02 , DOI: 10.1002/adom.202202975
Lijuan Kuang 1 , Shiqi Wang 1 , Haifei Wan 1 , Lili Chen 1 , Li Wang 1 , Yonghai Song 1
Affiliation  

A new imine-linked covalent organic framework (COFDHA-TAPB) with strong fluorescence is designed by using 2,5-dihydroxybenzaldehyde (DHA) and 1,3,5-tri(4-aminophenyl)benzene (TAPB) as monomers. The TAPB has a suitable aromatic skeleton in which slight distortion between phenyl groups reduces aggregation-caused quenching (ACQ). The hydroxyl group side chains of DHA form hydrogen bond with the imine bonds of COFDHA-TAPB to restrict intramolecular rotations. Hydrogen bonds are also formed between different layers of COFDHA-TAPB, which further restricts supramolecular rotation by narrowing the layer spacing. Moreover, the COFDHA-TAPB exhibits a hollow sphere structure, which also reduces ACQ and intramolecular rotation. Therefore, COFDHA-TAPB has a strong emission peak at 408 nm, which is used for nitrofurazone detection. The detection linear range is 0.33 µm–0.197 mm (0.066–39 µg mL−1), and the detection limit is 0.11 µm (0.022 µg mL−1). This work also provides an important guideline to design strongly fluorescent covalent organic framework by controlling layer spacing, aromatic linkers sizes and side chains of monomers for sensors.

中文翻译:

通过控制层间距、芳香连接体的大小和侧链设计用于检测呋喃西林的荧光共价有机骨架

以2,5-二羟基苯甲醛(DHA)和1,3,5-三(4-氨基苯基)苯(TAPB)为单体,设计了一种新型的亚胺连接共价有机骨架(COF DHA-TAPB ),具有强荧光。TAPB 具有合适的芳族骨架,其中苯基之间的轻微扭曲减少了聚集引起的猝灭 (ACQ)。DHA 的羟基侧链与 COF DHA-TAPB的亚胺键形成氢键以限制分子内旋转。COF DHA-TAPB的不同层之间也形成了氢键,这通过缩小层间距进一步限制了超分子旋转。此外,COF DHA-TAPB呈现出空心球结构,这也减少了 ACQ 和分子内旋转。因此,COFDHA-TAPB在 408 nm 处有一个强发射峰,用于呋喃西林检测。检测线性范围为0.33 µ m –0.197 m m (0.066–39 µg mL -1 ),检测限为0.11 µ m (0.022 µg mL -1 )。这项工作还为通过控制层间距、芳香连接基尺寸和传感器单体侧链来设计强荧光共价有机框架提供了重要指导。
更新日期:2023-03-02
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