Synthesis and Fluorescent Sensing Properties for Ce3+ Ions of Di-Schiff Base Amine Containing Amaide Bridge Probe

A fluorescent probe (L) of di-Schiff base amine ligand was designed and synthesized from 2,6-pyridine-dicarboxylic acid, ethylenediamine and p-hydroxybenzaldehyde by condensation reaction and reduction reaction. The structure was confirmed by means of IR, UV, ¹H NMR and MS. The research of fluorescence spectroscopy indicated that the probe L exhibited high selectivity for Ce³⁺. The spectroscopic titration indicated that A good linear work curve with R² = 0.99607, the stoichiometry of the Ce³⁺ complex was 1:1, the minimum detection limits for Ce³⁺was 3.8382×10^-6 mol/L and the binding constant of L to Ce³⁺ was estimated as 6.3734×10⁷ (mol/L)^-1. It was expected to be applied to the detection of trace Ce³⁺.