title: Highly Fluorescent Polyimide Covalent Organic Nanosheets as Sensing Probes for the Detection of 2,4,6-Trinitrophenol.
abstract: A new fluorescent polyimide covalent organic framework (PI-COF) has been successfully synthesized through solvothermal route using tetra(4-aminophenyl) porphyrin and perylenetracarboxylic dianhydride, which possesses porous crystalline and excellent thermal stability (>500 °C). Furthermore, few-layered PI covalent organic nanosheets (PI-CONs) can be easily obtained from the fluorescent PI-COF through a facile liquid phase exfoliation approach, which were confirmed by atomic force microscopy and transmission electron microscopy analysis. It is interesting that the fluorescent intensity of PI-CONs is obviously enhanced relative to that of PI-COF. The PI-CONs have been successfully utilized as an efficient fluorescent probe for the highly sensitive and selective detection of 2,4,6-trinitrophenol (TNP). The mechanism might be attributed to the combination of electron transfer and inner filter effect based on DFT calculations and spectral overlap data. The system exhibits a good linear response toward TNP over the range from 0.5 to 10 μM with a detection limit of 0.25 μM.
authors.affiliation: Shanghai Key Laboratory of Green Chemistry and Chemical Processes, Department of Chemistry, School of Chemistry and Molecular Engineering, East China Normal University , Shanghai 200241, China.
authors.forename: Cuiling
authors.initials: C
authors.lastname: Zhang
authors.affiliation: Institute of Electrochemical and Energy Technology, Department of Chemical Engineering, Shanghai Jiao Tong University , Shanghai 200240, China.
authors.forename: Shiming
authors.initials: S
authors.lastname: Zhang
authors.affiliation: Shanghai Key Laboratory of Green Chemistry and Chemical Processes, Department of Chemistry, School of Chemistry and Molecular Engineering, East China Normal University , Shanghai 200241, China.
authors.forename: Yinghan
authors.initials: Y
authors.lastname: Yan
authors.affiliation: Shanghai Key Laboratory of Green Chemistry and Chemical Processes, Department of Chemistry, School of Chemistry and Molecular Engineering, East China Normal University , Shanghai 200241, China.|NYU-ECNU Center for Computational Chemistry at New York University Shanghai, East China Normal University , Shanghai 200062, China.
authors.forename: Fei
authors.identifier: http://orcid.org/0000-0001-9458-9175
authors.initials: F
authors.lastname: Xia
authors.affiliation: Shanghai Key Laboratory of Green Chemistry and Chemical Processes, Department of Chemistry, School of Chemistry and Molecular Engineering, East China Normal University , Shanghai 200241, China.
authors.forename: Anni
authors.initials: A
authors.lastname: Huang
authors.affiliation: Shanghai Key Laboratory of Green Chemistry and Chemical Processes, Department of Chemistry, School of Chemistry and Molecular Engineering, East China Normal University , Shanghai 200241, China.
authors.forename: Yuezhong
authors.identifier: http://orcid.org/0000-0001-9535-3658
authors.initials: Y
authors.lastname: Xian
keywords: TNP; chemosensor; fluorescence; polyimide covalent organic nanosheets; solvothermal