Self-assembly of a quadrangular prismatic covalent cage templated by zinc ions: A selective fluorescent sensor for palladium ions |
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| Institution: | 1. Shandong Provincial Key Laboratory of Chemical Energy Storage and Novel Cell Technology, School of Chemistry & Chemical Engineering, Liaocheng University, Liaocheng 252059, China;2. Key Laboratory of Biobased Material and Green Papermaking, Key Laboratory of Pulp & Paper Science and Technology of Shandong Province/Ministry of Education, Qilu University of Technology (Shandong Academy of Sciences), Ji''nan 250353, China;3. National and Local Joint Engineering Research Center of MPTES in High Energy and Safety LIBs, Engineering Research Center of MTEES (Ministry of Education), Key Lab. of ETESPG(GHEI), South China Normal University, Guangzhou 510006, China;4. Jiangsu Collaborative Innovation Centre of Biomedical Functional Materials, Jiangsu Key Laboratory of New Power Batteries, School of Chemistry and Materials Science, Nanjing Normal University, Nanjing 210023, China |
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| Abstract: | Herein we report a covalent cage TPE-Zn4 based on a tetraphenylethylene molecule via subcomponent self-assembly, which is templated by zinc ions. TPE-Zn4 features a quadrangular prismatic cage structure, which is characterized by NMR, mass spectrum, and single-crystal X-ray diffractions. TPE-Zn4 emitted orange fluorescence (λem = 620 nm) in DMSO solution under the irradiation of UV light (λex = 395 nm) and can be applied as a fluorescence sensor for selectively detecting Pd2+. The fluorescence of TPE-Zn4 was quenched by Pd2+ in DMSO solution, and a very low detection limit of 62.3 nM was achieved. Mechanism studies reveal that the Pd2+ can replace the Zn2+, and the heavy atom effect and chelation-enhanced quenching effect between the Pd2+ and the cage probably cause the fluorescence quenching. |
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