Abstract:
In this work, two new fluorescence probes had been successfully synthesized for detection of Cu2+ based on core-substituted naphthalene diimide and Aza-BODIPY (N1102 and N1004). The probes exhibited ON-OFF fluorescence quenching toward Cu2+ in aqueous buffer solutions and provided high sensitivity and selectivity to Cu2+ in the presence of interfering metal ions. Especially, the Cu2+ sensing ability of the N1004 demonstrated absorbance and fluorescence signals in near-IR regions. The detection limit of N1102 and N1004 are 0.70 and 3.75 ppb, respectively which are lower than the acceptable drinking water concentration specified by the U.S. Environmental Protection Agency and World Health Organization. Importantly, the probes exhibited outstanding chromogenic and luminescent change in the presence of only Cu2+ and could detect Cu2+ in drinking water or human liver carcinoma cell line (HepG2) as a real sample.