Abstract
Binol-pyrene conjugate (BPC), as fluorescent probe was synthesized by multi-step synthetic strategies. BPC acts as a single sensor for dual analyte detection by a turn “on-off” mechanism for Ag+ and CO32− ions. In the emission spectra, the monomer peaks of BPC were drastically quenched by the addition of Ag+ and CO32− ions, due to the reverse photo-induced electron transfer (PET) process, excited-state deactivation via vibration and rotation of binaphthyl ring and the heavy atom effect responsible for the spin forbidden process. The probe BPC is highly selective and sensitive to Ag+ and CO32− ions even in the presence of various interfering cations and anions at the physiological pH. The similar sensing strategy of BPC for Ag+ and CO32− ions were further applied into the living cells, and their limit of detection (LOD) downs to 1.2 × 10-7 M and 14 × 10-6 M, respectively, which are close to the World Health Organization (WHO) drinking water standards. Furthermore, the binding interaction between the probe BPC with Ag+ and CO32− ions and dynamic mode of quenching are evidenced by Stern-Volmer plots, quantum yields, NMR and DFT analysis.
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