| Luminescent MOFs have obtained increasing attention due to their promising applications in display,lighting,chemical sensor and bioimaging.Generally,luminescence in MOFs derives from the building components: metal ions or clusters and/or organic ligands can produce emission;furthermore,absorbed guest molecules can also generate luminescence.In this thesis,we are focused on the construction of luminescent MOFs based on 3,4',5-trimethylbiphenyl?H3bpt?linkers,in order to study the relationship between diverse transition or lanthanide metal ions and crystal structure,luminescent properties.In addition,the obtained luminescent MOFs were explored their functionality and potential application perspective.The thesis is composed of five chapters.The first chapter is mainly related to the development of luminescent MOFs,mechanism and the significance of research topic.In the second chapters,three novel compounds,namely[Zn?bpt?][NH2?CH3?2]·DMF?1?,[Cd2?bpt??H2O?2][NO3]3·?DMF?4·?H2O?2.5?2?[Cd3?bpt?2?DMA?3]·?DMA?5.5?3?,have been synthesized.Furthermore,with the combination of theoretical prediction and experimental synthesis,two microporous MOF,namely [NH2?CH3?2][Zn4O?bpt?2?bdc?0.5]·5DMF?4?,[NH2?CH3?2]Zn4O?bpt?2?bdc-NH2?0.5]·5DMF?5?has been designed and synthesized.The fluorescence explorations showed that compound 5 can be used to detect TNP with fast response,highly effectivity and sensitivity,even in the presenceof other interfering nitro explosives,and simultaneously shows emission quenching with red-shifted of the emission maxima.Clearly,the amino functionalized MOF show great potential as a promising fluorescence sensor for selectively sensing TNP.In the third chapter,two new 3D luminescent MOFs,namely[La?bpt??DMF??H2O?]·DMF·?H2O?4?6?,[H2N?Me?2][Eu3?OH??bpt?3?H2O?3]?DMF?2·?H2O?4?7?,have been successfully assembled by lanthanide metal ions and biphenyl-3,4',5-tricarboxylic acid?H3bpt?.Compound 7 exhibits high water stability with the p H range from 3 to 10,which can be served as a promising luminescent probe for sensing Fe3+ in aqueous solution.Additionally,compound 7 is selective toward rhodamine B?Rh B?with superior adsorption capacity?735 mg/g?,which is the highest among the reported Ln-MOFs for Rh B removal so far.Periodic density functional theoretical calculation further confirms selective adsorption for rhodamine B over other dyes.In fourth chapter,two novel lanthanide MOFs,namely[Eu4?bpt?4?DMF?2?H2O?6]·?DMF?5·?H2O?4?8?,[Tb4?bpt?4?DMF?2?H2O?8]·?DM F?5·?H2O?3?9?,were synthesized by hydrothermal conditions,forming a three-dimensional structure.Single crystal X-ray diffraction reveals that the compounds 1 and 2 are heteromorphic and have different topology due to the change of metal ions with radii and coordination steric hindrance.The unique luminescent properties of Eu3+ and Tb3+ ions motivated us to dope different amounts of Tb3+ into a single host to obtain light tunable materials.The tunable multicolor emissions,including red,red-orange,orange,yellow and green,can be readily achieved from the doped compounds 10-13 by increasing the concentration of Tb3+.In addition,the compounds 13 exhibits different temperature-dependent luminescent behaviors when the low concentration of Eu3+,generating the new Ln-MOFs thermometers.The last chapter is related to the summary of this thesis. |
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