Journal
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
Volume 414, Issue 16, Pages 4707-4716Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s00216-022-04093-5
Keywords
Sensor; Long-wavelength; Fluorescence; Cu2+; Biphenylacrylonitrile
Funding
- National Natural Science Foundation of China [21406036]
- Fujian Science and Technology Project [2019N0010]
- Undergraduate innovation program of FJNU (2022)
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A novel AIE molecule (DHBB) with long-wavelength emission and good emission in aqueous media was prepared, which showed good sensing selectivity for Cu2+ and stable sensing ability at pH = 5-9. The recovery rate of cu2+ sensing in real samples was 96%. Moreover, DHBB exhibited good bio-imaging performance and sensing ability for Cu2+ in living cells.
Although numerous fluorescence sensors for Cu2+ have been presented, a long-wavelength sensor in aqueous media has rarely been reported as expected due to practical application requirements. In this work, a novel AIE molecule (DHBB) containing two biphenylacrylonitrile units bridged by dibenzylidenehydrazine was prepared. It possessed the merits of long-wavelength emission, good emission in aqueous media, and multiple functional groups for binding Cu2+. It exhibited good sensing selectivity for Cu2+ among all kinds of tested metal ions. The detection limit was as low as 1.08 x 10(-7) M. The sensing mechanism was clarified as 1:1 stoichiometric ratio based on the binding cooperation of O and N functional groups of DHBB. The selective sensing ability for Cu2+ remained stable at pH = 5-9 and was influenced little by other metal ions. The Cu2+ sensing ability of DHBB was applied in real samples with 96% recovery rate. The bio-imaging experiment of living cells suggested that DHBB possessed not only good bio-imaging performance but also sensing ability for Cu2+ in living environments. This work suggested the good application prospect of DHBB to sense Cu2+ in real samples and living environment.
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