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3-[Bis(pyridin-2-ylmethyl)amino]-5-(4-carboxyphenyl)-BODIPY as Ratiometric Fluorescent Sensor for Cu 2 .
Materials 2018 May 17
We developed an asymmetric fluorescent sensor 1 for Cu2+ , based on 4,4-difluoro-4-bora-3a,4a-diaza- s -indacene (BODIPY), by introducing 4-carboxyphenyl and bis(pyridin-2-ylmethyl)amine groups at the 5- and 3-positions, respectively, of the BODIPY core. We then investigated the photophysical and cation-sensing properties of the sensor. BODIPY 1 showed large absorption and fluorescence spectral shifts on binding to Cu2+ . The fluorescence peak at 580 nm red-shifted to 620 nm. The binding stoichiometry of BODIPY 1 and Cu2+ was 1:3. The ratio of the fluorescence intensity at 620 nm to that at 580 nm ( F 620 / F 580 ) increased with increasing concentration of Cu2+ (3⁻10 equiv); this enabled ratiometric determination of Cu2+ . Although BODIPY 1 showed good selectivity for Cu2+ , there was an interfering effect of Fe3+ . BODIPY 1 could be used for the naked-eye detection of Cu2+ in a water-containing sample.
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