Abstract
A novel hemicyanine-based ratiometric fluorescent probe 3 for Cu2+ was described. The probe exhibited fluorescence emission at 448nm. Upon addition of Cu2+, the emission at 448nm quenched and simultaneously generated a significant bathochromic shift of the emission maximum to 503nm due to the Cu2+-triggered hydrolysis reaction of the picolinate moiety. Thus, a single-excitation, dual-emission ratiometric measurement with a large red shift in emission (Δ55nm) and remarkable changes in the ratio (F503nm/F448nm) of the emission intensity (R/R0 up to 22-fold) could be established. Moreover, the probe exhibited a large Stokes shift, high sensitivity (detection limit of 1.1nM), and high selectivity for Cu2+ over other metal ions in complete aqueous solution.
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