A novel terephthalaldehyde based turn-on fluorescent chemosensor for Cu2+ and its application in imaging of living cells

• DOI: 10.1039/c7pp00182g
• Publication Date: 2017-07-21T03:33:34Z
• Authors: Pritam Torawane; Karunesh Keshav; Mukesh K. Kumawat; Rohit Srivastava; Thangaraj Anand; Suban Sahoo; Amulrao Borse; Anil Kuwar
• Keywords: Moiety; Turn (biochemistry); Imine; Stoichiometry

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.