一种具有荧光性质的阳离子Ga-MOF用于Fe^(3+)和硝基化合物识别  

A Microporous Cationic Ga(Ⅲ)-MOF with Fluorescence Properties for Selective sensing Fe^(3+)Ion and Nitroaromatic Compounds

作　　者：吴季 张浩 骆昱晖 耿吴越 兰亚乾 WU Ji;ZHANG Hao;LUO Yuhui;GENG Wuyue;LAN Yaqian(School of Environmental and Chemical Engineering,Jiangsu Ocean University,Lianyungang 222000,China;School of Chemistry,South China Normal University,Guangzhou 510631,China)

机构地区：[1]江苏海洋大学环境与化学工程学院,连云港222000 [2]华南师范大学化学学院,广州510631

出　　处：《高等学校化学学报》2022年第1期137-145,共9页Chemical Journal of Chinese Universities

基　　金：江苏省“六大人才高峰”高层次人才项目(批准号:XCL-009);江苏省先进材料功能调控技术重点实验室开放基金(批准号:AM201902)资助~。

摘　　要：通过溶剂热法合成了一种新型阳离子镓金属-有机框架Ga-MOF,其化学式为[Ga_(3)O(H_(2)O)_(3)(TCA)_(2)]·NO_(3)·6DMF·2H_(2)O(JOU-27,H_(3)TCA=4,4′,4″-三苯胺三羧酸).结构分析表明,JOU-27是基于氧心三核镓簇的三维微孔结构.由于荧光配体H_(3)TCA的引入,JOU-27具有强的荧光发射强度,因此可用于检测Fe^(3+)离子和硝基芳香族化合物.结果表明,其对Fe^(3+)的检出限低至2.22×10^(−6)mol/L(Stern-Volmer常数K_(SV)=52823 L/mol);当硝基苯(NB)浓度仅为3.27×10^(−3)mol/L时,荧光猝灭效率可达91%.进一步的研究表明,JOU-27的猝灭性能可能与荧光共振能量转移(FRET)效应、激发光吸收竞争以及骨架激发态与硝基芳烃化合物之间的电子转移有关.A new cationic gallium-organic framework,namely[Ga_(3)O(H_(2)O)_(3)(TCA)_(2)]·NO_(3)·6DMF·2H_(2)O(JOU-27,H_(3)TCA=4,4′,4″-tricarboxyltriphenylamine),has been synthesized by solvothermal method and characterized.Struc⁃tural analyses show that JOU-27 is a three-dimensional microporous framework based on oxygen-core trinuclear galli⁃um clusters.Due to the introduction of fluorescent ligand,JOU-27 shows strong fluorescence emission and was devel⁃oped as a fluorescent sensor to detect Fe^(3+)ion and nitroaromatic compounds.The detection limit of Fe^(3+)is as low as 2.22×10^(−6) mol/L(K_(SV)=52823 L/mol,K_(SV) is the Stern-Volmer constant).When the nitrobenzene(NB)concentration is only 3.27×10^(−3) mol/L,the quenching efficiency can reach 91%.In addition,further studies show that the quenching performance of JOU-27 may be due to the fluorescence resonance energy transfer(FRET)effect,the competition of excitation light absorption,and the electron transfer between the excited state of the framework and nitroaromatics.

关 键 词：阳离子型金属-有机框架 镓 荧光识别 Fe^(3+)离子 硝基芳烃化合物 

分 类 号：O611[理学—无机化学]