Research On Fluorescence Sensing,Dye Adsorption And Supercapacitors Of MOFs Based On Ligand Of Two Coordination Groups

This paper aims to explore the effects of different organic ligands on their crystal structures,with emphasis on their related properties.Aromatic carboxylic acids and N/O compounds with multiple coordination sites were selected as ligands and their applications in fluorescent sensing,dye adsorption and supercapacitors were studied by forming MOFs with different dimensions and structures with lanthanide and transition metals.The specific contents are as follows:The first part is the introduction,which firstly briefly introduces the concept and development of Metal-Organic Framework,and then describes its practical application.Finally,from the perspective of organic ligands,it further introduces the influence of different organic ligands on their properties.And will take this topic as the basis and significance.In the second part,a 3D lanthanide coordination polymer{[La?SIP??H₂O?₃]·H₂O}_n?La-MOF?was synthesized successfully by the solvothermal reaction of La?NO₃?₃·6H₂O and 5-sulfoisophthalic acid monosodium salt?Na H₂SIP?.In particular,two oxygen atoms of sulfate participate in the coordination,which is unusual in all the complexes.The fluorescence and sensing properties of La-MOF were invsetigated in detail.Moreover,the supercapacitor properties of La-MOF as electrode material were also studied.In the third part,three novel Metal-Organic Frameworks?MOFs?formulated as[Cd?5-mipa??bpe?_1.5?0.8DMF]_n?1?,[Zn?5-mipa??bpe?]_n?2?and{[Ni?5-mipa??bpe?]?0.4IPA}_n?3??IPA=iso-propyl alcohol?were successfully obtained via solvothermal reaction between the corresponding transition metal nitrates and 5-methylisophthalic acid?5-H₂mipa?,1,nitrobenzene by the luminescence quenching effect.The selective adsorption of compounds2 and 3 to anionic dyes(Methyl Orange?MO?and Congo Red?CR?and cationic dye Methylene Blue?MB?were examined.The results demonstrated that 2 and 3 showed good adsorption properties for MO and CR anionic dye molecules.In the forth part,a novel two-dimensional Cd-based Metal-Organic Framework,{[Cd?Hcpnc??DMF?]·DMF·2H₂O}_n?Cd-MOF?has been synthesized successfully under solvothermal conditions by utilizing a multifunctional N,O-building block ligand,2-?2,5-dicarboxylphenyl?nicotinic acid?H₃cpnc?.The compound shows high selectivity andAdditionally,the Cd-MOF exhibits an excellent specific capacitance of 321 F g^-1 at 0.5 A g^-1 and it still retains 95.2%of the original capacitance after 1000 cycles.Therefore,the Cd-MOF as a kind of bifunctional material will have broad application prospects in luminescence detection and supercapacitors.