The optical properties of the symmetric salamo-like chemical probe (H2CS) of Cu2+ were studied in EtOH/H2O (1:1, v/v) solution by UV-Vis and fluorescence spectroscopy. In the fluorescence spectrum, the coordination of Cu2+ with H2CS results in fluorescence quenching owing to the paramagnetic nature of Cu2+ ions. The binding constant of Cu2+ to the H2CS sensor was calculated as 1.17 × 1011 M–1 and LOD was obtained as 5.3 × 10–8 M. When Cu2+ ions were added, the UV-Vis spectra changed, obviously due to the electron transfer from sensor to metal bond, and a new absorption band appeared at 372 nm. When the ethylenediaminetetraacetic acid (EDTA) solution was added to the H2CS–Cu2+ solution, causing a large binding constant, with EDTA releasing the free sensor molecule and finally achieving a fluorescence shutdown phenomenon.
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Abstract of article is published in Zhurnal Prikladnoi Spektroskopii, Vol. 89, No. 1, p. 137, January–February, 2022.
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Li, RY., Gao, SX., Liu, C. et al. Dual-Channel More Flexible Salamo-Like Chemosensor for Fluorogenic Sensing of Copper Ion in Semi-Aqueous Medium. J Appl Spectrosc 89, 177–185 (2022). https://doi.org/10.1007/s10812-022-01341-5
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DOI: https://doi.org/10.1007/s10812-022-01341-5