Study On The Construction And Performance Of Functional Lanthanide Metal Organic Frameworks Fluorescence Sensors

Lanthanide elements have excellent photoluminescence performance,Eu and Tb elements have huge applied foreground in fluorescence sensing especially.MOFs have designable and adjustable porous crystal structure.Lanthanide metal-organic frameworks have characteristic photoluminescence performance and crystal structure,having huge potential in detecting anions,cations,small molecules and temperature.In order to build Ln-MOFs having novel structure and multiple functionalities,we synthesized a series of Ln-MOFs fluorescence sensors by designing ligands elaborately and doping lanthanide elements rationally.Moreover,we studied the sensing performance and mechanism carefully.This article includes:1.Introduction of Ln-MOFs fluorescence sensors includes background,building strategy,assessment method and application advance.2.In order to obtain Ln-MOFs fluorescence sensors having hydrogen bonding sites and good photoluminescence performance,we designed a novel V-shaped ligand and synthesized a series of Ln-MOF-1（Ln=Eu,Gd,Tb）by solvothermal method.Eu-MOF-1 and Tb-MOF-1 can detect p-phenylenediamine and o-phenylenediamine.Eu_xTb_1-x-MOF-1（x=0.02,0.05,0.1）can be used as ratio fluorescence thermometers.3.Inspired by Ln-MOF-1,we synthesized another V-shaped ligand having special energy levels by introducing naphthalene groups and obtained a series of Ln-MOF-2（Ln=Eu,Gd,Tb）by solvothermal method.Eu-MOF-2 has two luminescence centers including the ligand and Eu³⁺,causing that Eu-MOF-2 not only can be used as a ratio fluorescence thermometer but also can detect picric acid.4.In order to obtain Ln-MOFs fluorescence sensors detecting H₂O content in D₂O,we designed a hydrophilic ligand by introducing oxalic acid groups and cyclohexanediamine groups.And we obtained a series of Ln-MOF-3（Ln=Eu,Gd,Tb）by solvothermal method.Eu_0.4Tb_0.6-MOF-3 can used as a ratio fluorescence sensor detecting H₂O content in D₂O.5.Summary and expectation include summarizing above research thought and looking forward to the development of Ln-MOFs fluorescence sensors.