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A Three-Dimensional Tetraphenylethylene-Based Fluorescence Covalent Organic Framework for Molecular Recognition

preprint
submitted on 21.09.2020 and posted on 22.09.2020 by Junxia Ren, Yaozu Liu, Xin Zhu, Yangyang Pan, Yujie Wang, Hui Li, Yue Tian, Qinghai Zhou, Taifeng Liu, Shilun Qiu, Qianrong Fang, Shengxiong Xiao

The development of highly-sensitive recognition of hazardous chemicals, such as volatile organic compounds (VOCs) and polycyclic aromatic hydrocarbons (PAHs), is of significant importance because of their widespread social concerns related to environment and human health. Here, we report a three-dimensional (3D) covalent organic framework (COF, termed JUC-555) bearing tetraphenylethylene (TPE) side chains as an aggregation-induced emission (AIE) fluorescence probe for sensitive molecular recognition. Due to the rotational restriction of TPE rotors in highly interpenetrated framework after inclusion of dimethylformamide (DMF), JUC-555 shows impressive AIE-based strong fluorescence. Meanwhile, owing to the large pore size (11.4 Å) and suitable intermolecular distance of aligned TPE (7.2 Å) in JUC-555, the obtained material demonstrates an excellent performance in the molecular recognition of hazardous chemicals, e.g., nitroaromatic explosives, PAHs, and even thiophene compounds, via a fluorescent quenching mechanism. The quenching constant (KSV) is two orders of magnitude better than those of other fluorescence-based porous materials reported to date. This research thus opens 3D functionalized COFs as a promising identification tool for environmentally hazardous substances.

History

Email Address of Submitting Author

qrfang@jlu.edu.cn

Institution

Jilin University

Country

China

ORCID For Submitting Author

0000-0003-3365-5508

Declaration of Conflict of Interest

no conflict of interest

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