化学
荧光
水杨醛
席夫碱
结合常数
滴定法
乙二胺
氢键
检出限
螯合作用
质子核磁共振
配合物的稳定常数
铜
分析化学(期刊)
无机化学
光化学
离子
分子
结晶学
立体化学
结合位点
有机化学
色谱法
生物化学
物理
量子力学
作者
Cai Liu,Kang Yan,Xu Wang,Yunfeng Chen,Huiping Xiao
标识
DOI:10.1016/j.saa.2023.123526
摘要
A fluorescent probe (L) of bis Schiff base secondary amine ligand was designed and synthesized from 2,6-pyridinedicarboxylic acid, ethylenediamine and salicylaldehyde by condensation and reduction reaction. Its structure was characterized by IR, UV-Vis, LIF, 1HNMR, 13C NMR, MS and elementary analysis. Investigation of binding test indicated that probe L could sensitively and selectively detect Cu2+ ion with striking fluorescent signaling responses in anhydrous ethanol solvent. Results from Job's plot, fluorescent titration, and MS experiments indicated a 1:1 binding ratio between probe L and Cu2+, with a complexation constant of 1.28 × 108 M-1. According to MS, IR and molar conductivity analysis, the mechanism of the probes' detection of Cu2+ may due to CHEF mechanism by the lone electron pairs in the N atom, and the enhancement of the molecular rigidity caused by disruption of intermolecular hydrogen bonding force, which leading to the occurrence of chelation fluorescence enhancement. The detection limit of complexation constant was 2.69 × 10-8 M in the linear range of 0-40 μM, which provided an effective and convenient testing for trace copper in surface water and drinking water.
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