Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 265, Issue -, Pages 234-241Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2018.03.050
Keywords
1, 8-naphthalimide fluorophore; Cu2+ detection; Turn-on mechanism; Visual detection
Funding
- National Natural Science Foundation of China [50903057, 51273134]
- Jiangsu Provincial Postdoctoral research funding [1501087C]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
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A novel 1, 8-naphthalimide-based derivative, named as (E)-6-(2-((1H pyrrol-2-yl)methylene)hydrazinyl)-2-(2-hydroxyethyl)-1H-benzo[de]isoquinoline-1,3(2H)-dione (HHBD), was synthesized via facile condensation and substitution reactions. It showed high sensitivity and selectivity to Cu2+ in CH3CN-H2O (v/v = 3:7, pH = 7.0) solution, and the hypsochromic shift of the absorption band & the enhancement of the fluorescence emission intensity were distinct for the detection of Cu2+ even in the presence of other competitive metal ions, such as Ag+, Al3+, Ca2+, Co2+, Cr3+, Fe2+, Fe3+, K+, Li+, Mg2+, Na+, Ni3+, Zn2+. The binding stoichiometry between HHBD and Cue* was calculated from Job's plot and the complexation mechanism was explored by H-1 NMR and FTIR spectrophotometry. Furthermore, HHBD binding capability with Cu2+ was further demonstrated using DFT calculations. The probe was applied successfully in real water samples assay. Strip papers were also designed and used to detect various concentrations of Cu2+ aqueous solution, whose color change showed their potential application for on-site detection of Cu2+ in pollution water. (C) 2018 Elsevier B.V. All rights reserved.
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