Journal
DYES AND PIGMENTS
Volume 180, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.dyepig.2020.108513
Keywords
Fluorescent probe; Dansyl; Cu2+; pH; Coordination; Protonation
Funding
- National Natural Science Foundation of China [21676003]
- Beijing Municipal Science and Technology Project [D17110500190000]
- Support Project of High-level Teachers in Beijing Municipal Universities in the Period of 13th Five-year Plan [CITTCD201804026]
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Herein, a dansyl-based fluorescent probe bearing a glycylglycine group (GG-Dns) is reported. The probe demonstrates suitable selectivity and sensitivity towards Cu2+ in aqueous media over a wide pH range (6-13) through a fluorescence turn-off' mechanism. The determined detection limit is 0.29 mu M (Cu2+ concentration), and the association constant is 3.09 x 10(4) M-1, with 1:1 coordinate stoichiometric ratio. The probe displays an appropriate detection performance for Cu2+ in real drinking water samples, indicating the potential applicability of GG-Dns even in complex environments. Furthermore, in aqueous environments with pH below 6, GG-Dns is sensitive toward pH changes within a narrow range and with a fluorescence on-off' function. The sensitive detection characteristics of Cu2+ can be ascribed to the coordination performance of GG moiety to Cu2+, whereas pH responsiveness is ascribed to the protonation of Dns moiety's dimethylamine group.
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