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• W4200487497 abstract "The “one-pot” method to prepare cyclized m -CMP@SiO 2 fluorescence probe and fluorescence mechanism to detect Fe 3+ and Cr 3+ in aqueous solution. • In situ cyclization was used to improve the stability of Sciff-base condensation products. • The “one-pot” method was successfully uesd to prepare CMP-coated silica nanospheres. • CMP-coated silica nanospheres were successfully applied to fluorescence detect Fe 3+ and Cr 3+ . Schiff-base condensation reaction was often used to prepare conjugated microporous polymers (CMPs). However, due to the relatively unstable imine bond in the product, the application of CMPs in some strong acid-base environments was limited. Therefore, it was necessary to further strengthen the stability of CMPs by “bottom-up” strategy. For this purpose, three kinds of cyclized CMPs (x-CMP x = m, p, bi) were successfully prepared by Schiff-base reaction followed by an acid-catalyzed in situ cyclization with 1,5,9-triamine-triphenylene (TATP) and m -phthalaldehyde ( m -PA), p -phthalaldehyde ( p -PA) or 4,4'-biphenyldicarboxaldehyde (bi-PA) as precursors. The in situ cyclization at the imine bond was demonstrated by X-ray photoelectron spectroscopy and Raman spectroscopy. Because cyclized CMPs were amorphous powder, their dispersity were not ideal, which affects them further applications. Therefore, through a “one-pot” method, these CMPs were also coated onto silica nanospheres, assigned as x-CMP@SiO 2 (x = m, p, bi), exhibiting core–shell structure and excellent monodispersity. Due to the difference dispersity of three x-CMP@SiO 2 (x = m, p, bi) in aqueous solution, the fluorescence quantum yields were different, which were 15.3%, 14.4% and 11.2%, respectively. As fluorescent sensors, three cyclized x-CMP@SiO 2 (x = m, p, bi) could selectively generated fluorescence quenching response to Fe 3+ and Cr 3+ in aqueous solution. Compared with amorphous CMPs, the resulting CMP@SiO 2 nanomaterials not only improved the dispersity and mechanical strength, but also offered the convenience for subsequent applications. It is expected this feasible method would facilitate CMPs to be widely explored in fluorescence detection and other research fields." @default.
• W4200487497 created "2021-12-31" @default.
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• W4200487497 date "2022-05-01" @default.
• W4200487497 modified "2023-10-17" @default.
• W4200487497 title "Cyclized conjugated microporous polymer-coated silica nanospheres as fluorescent sensors for iron (III) and chromium (III)" @default.
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• W4200487497 doi "https://doi.org/10.1016/j.cej.2021.134368" @default.
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