Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 235, Issue -, Pages 414-419Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2016.05.084
Keywords
Rhodamine derivative; Cu2+ detection; Colorimetric; Chemosensor; Aqueous solution
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A new colorimetric off-on chemosensor based on rhodamine derivative bearing thiophene group has been synthesized. The chemosensor shows an excellent sensitivity and selectivity for Cu2+ over competing metal ions (Pb2+, Hg2+, Fe3+, Fe2+, Zn2+ Cd2+, Mn2+, Ba2+, Ag+ and Cr3+) in H2O-EtOH solution (1/4, v/v). A distinctive peak at 561 nm appears in the UV-vis absorption upon the addition of Cu2+ in the rhodamine derivative solution and an obvious color change to be pink from colorless. The interaction of Cu2+ and the chemosensor are proven to adopt a 1:1 binding stoichiometry, and the recognition process is expected to be completed within 1 min. With a detection limit of 1.7 x 10(-7)mol/L, the chemosensor shows great potential to monitor Cu2+ in environmental analysis systems. (C) 2016 Elsevier B.V. All rights reserved.
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