Journal
JOURNAL OF LUMINESCENCE
Volume 167, Issue -, Pages 156-162Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jlumin.2015.06.018
Keywords
Rhodamine; Cu2+ ion; Naked-eye detection; Turn-on fluorescence; INHIBIT logic gate
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We report the design and synthesis of a new piperazine-bis(rhodamine-B) (RB-P-RB)-based indicator for selective detection of Cu2+ ion. Optical sensing behavior toward various metal ions including alkali, alkaline earth and transition metal ions (Na+, K+, Ba2+, Mg+, Ca2+, Zn2+, Cd2+, Co2+, Ni2+, Pb2+, Cu2+, Hg2+, and Ag+) were investigated by UV-vis and fluorescence spectroscopy in ethassnol solution. The indicator showed highly selective and sensitive colorimetric and turn-on fluorescence enhancement responses toward Cu2+ ion owing to the ring-opening structure of the rhodamine spirolactam. The significant change from colorless to pink upon the addition of Cu2+ could make it a suitable naked-eye indicator for Cu2+. Furthermore, a possible ring-opening mechanism (off-on) of the rhodamine spirolactam induced by Cu2+ binding is supported by Job plot, ESI-mass, FT-IR, and H-1 NMR. More significantly, the probe displayed highly selective Cu2+-amplified absorption in the presence of Cu2+ ions. Finally, using Cu2+ and EDTA as inputs and the fluorescence emission intensity as output, an INHIBIT logic gate can be constructed at the molecular level. (C) 2015 Elsevier B.V. All rights reserved.
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