基于UiO–66–NH2@Eu–MOFs比率荧光探针的构建及其对PO_(4)^(3–)检测  

PO_(4)^(3–)Ions Detection Based on UiO–66–NH2@Eu–MOFs Ratio Fluorescent Probes

作　　者：郑佳红[1] 周艳 ZHENG Jiahong;ZHOU Yan(School of Materials Science and Engineering,Chang'an University,Xi'an 710061,China)

机构地区：[1]长安大学材料科学与工程学院,西安710061

出　　处：《硅酸盐学报》2023年第3期796-802,共7页Journal of The Chinese Ceramic Society

基　　金：陕西省自然科学专项基金(2020JM-221);陕西省重点研发项目(2022GY-358);长安大学中央高校基本科研业务费专项资金资助(300102310203,300102311405,300102312406,300102312405);大学生创新创业训练计划(S202210710247)。

摘　　要：以发射蓝色荧光的Ui O–66–NH2和发射红色荧光的Eu–MOFs为荧光基团,构建了比率荧光探针(Ui O–66–NH2@Eu–MOFs),成功应用于环境水样中的微量PO_(4)^(3–)的检测。将发射蓝色荧光UiO–66–NH2与发射红色荧光Eu–MOF结合,构建了测定环境水样中的微量PO_(4)^(3–)的比率荧光探针。结果表明:当PO_(4)^(3–)存在时,由于配体–金属电荷转移(LMCT)效应的减弱,导致UiO–66–NH2的荧光增强;另一方面,PO_(4)^(3–)和Eu3+的强配位作用将阻止配体–金属的能量转移(LMET),破坏了“天线”效应并导致Eu–MOF的荧光猝灭,在最优条件下,F445/F633与PO_(4)^(3–)在1~12μmol/L浓度范围内呈现良好的线性关系,表明该传感器对检测PO_(4)^(3–)有较好的选择性和灵敏性,为PO_(4)^(3–)的快速检测提供了一种新思路。Using blue-emitting UiO–66–NH2with red-emitting Eu–MOF as fluorescence groups,a ratio fluorescence probe(UiO–66–NH2@Eu–MOF)was constructed and successfully applied to the determination of trace PO_(4)^(3–)ions in environmental water samples.A ratiometric fluorescent probe for the determination of trace PO_(4)^(3–)ions in environmental water samples was constructed via combining blue-emitting UiO–66–NH2with red-emitting Eu–MOF.As PO_(4)^(3–)ions concentration increases,the coupling of PO_(4)^(3–)ions with Zr4+ions in UiO–66–NH2leads to a weakened ligand–metal charge transfer effect,effectively restoring the luminescence of UiO–66–NH2.Also,an intense coordination of Eu3+ions with PO_(4)^(3–)ions can hinder the ligand–metal energy transfer,destroy the"antenna"effect,and lead to the quenching of Eu–MOF fluorescence.Under optimal conditions,a ratio of the fluorescence intensity at 445 nm to the fluorescence intensity at 633 nm is linearly related to PO_(4)^(3–)ions concentration in the range of 1-12μmol/L.The sensor constructed has a good selectivity and accuracy,thus providing an effective way for the rapid detection of PO_(4)^(3–)ions.

关 键 词：荧光 磷酸根离子 配体–金属电荷转移 配体–金属能量转移 天线效应 

分 类 号：R318.08[医药卫生—生物医学工程]