A ketone-functionalized carbazolic porous organic framework for sensitive fluorometric determination of p-nitroaniline
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A novel ketone-functionalized carbazolic porous framework named PBPMCz is presented for fluorometric determination of p-nitroaniline (PNA). PBPMCz was prepared by FeCl3-promoted oxidative coupling polymerization of 1,3,5-tris((4-(9H-carbazol-9-yl)phenyl)methanone-1-yl)benzene. The polymer possesses a BET surface area of above 907 m2∙g−1 with a pore volume of 0.72 cm3∙g−1. Compared to the ketone-free framework, the green fluorescence of the probe PBPMCz is more strongly quenched by PNA. Figures of merit include (a) excitation/emission wavelengths of 366/540 nm; (b) a Stern-Volmer constant (Ksv) of 2.2 × 104 M−1, and (c) a detection limit of 1.1 μM. Furthermore, PBPMCz shows different quenching behaviors of PNA compared with o-nitroaniline and m-nitroaniline. The excellent performance of the fluorescent probe is ascribed to the abundant carbazole sites and ketone groups in PBPMCz. These facilitate the electron transfer and hydrogen-bonding interactions between PNA and the polymer.
KeywordsCarbazolic porous framework Oxidative coupling Fluorescence sensing Nitroaniline isomers Quenching mechanism Detection limit Electron transfer
This work was supported by the financial support from the National Natural Science Foundation of China (Grant Nos. 51703031 and 21401053).
Compliance with ethical standards
The author(s) declare that they have no competing interests.
- 26.Yang Y-J, Wang M-J, Zhang K-L (2016) A novel photoluminescent Cd(ii)–organic framework exhibiting rapid and efficient multi-responsive fluorescence sensing for trace amounts of Fe3+ ions and some NACs, especially for 4-nitroaniline and 2-methyl-4-nitroaniline. J Mater Chem C 4(48):11404–11418CrossRefGoogle Scholar