A Dual‐Functional “On‐Off‐On” Relay Fluorescent Probe for the Highly Sensitive Detection of Copper(II) and Phosphate Ions
Minmin Wang, Chun Wang, Miao Wang, Tongming Sun, Yang Huang, Yanfeng Tang, Jianfeng Ju, Lujie Shen, Yeyu Hu, Jinli Zhu
Abstract
Abstract A high‐efficiency dual‐functional on‐off‐on fluorescence probe: 2′–4′‐dihydroxydiphenyl‐8‐formyl‐7‐hydroxycoumarin hydrazine ( L ) based on photoelectron transfer mechanism (PET) was designed and synthesized, and its ion recognition characteristics were fully studied by spectroscopy. As expected, probe L shows highly sensitive to Cu 2+ in EtOH‐HEPES (20 mM v/v, 80 : 20, pH =7.40) solution, and its detection limit up to 6.14 ×10 −7 M. The stoichiometric ratio of L−Cu 2+ complex was determined as 1 : 1 based on 1 H NMR titration and ESI‐MS. Meanwhile, the resulted L−Cu 2+ complex shows good selectivity for the phosphoric acid family anion (H 2 PO 4 − , HPO 4 2− and PO 4 3− ), which denote probe L the dual‐function in rapid detection of Cu 2+ and phosphate family's ions.