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A novel terephthalaldehyde based turn-on fluorescent chemosensor for Cu 2+ and its application in imaging of living cells.
Photochemical & Photobiological Sciences 2017 September 14
A new terephthaldehyde-based chemosensor 1 bearing an aminophenol recognition unit has been synthesized and applied to the fluorescent sensing of metal ions. Molecular system 1 acts as a highly selective and sensitive fluorescence turn-on sensor for Cu2+ . The sensing mechanism has been explored. It is proposed that Cu2+ binds with the imine and hydroxyl moiety of 1 in 1 : 2 binding stoichiometry, thereby enhancing the fluorescence at 386 nm. The detection limit and association constant (Ka ) of 1 with Cu2+ were found to be 0.62 μM and 6.67 × 104 M-1 , respectively. Chemosensor 1 has shown excellent specificity towards Cu2+ and has been successfully applied to the determination of Cu2+ in live L929 cells.
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