Synthesis,Characterization And Application Of A New Three-Dimensional Mental Organic Frameworks Based On Conjugated Saddle-Shaped Carboxy Ligand

Due to owing porous properties,MOFs（metal organic frameworks）materials have been widely used in gas adsorption and storage,electrocatalysis and photocatalysis in recent years.Due to 3D MOF materials are synthesized by using the variety of metal joints and their advantages（such as high specific surface area）,there are many researches have concentrated on synthesis of 3D MOFs.However,most of the current MOF materials are 3D MOF materials with poor electrical conductivity.The study of three-dimensional materials with high electrical conductivity has become a new hot spot in recent years with the development of electrocatalytic and photocatalytic materials.By referring to the characteristics of high electrical conductivity of two-dimensional MOFs materials,we designed three-dimensional saddle-like ligands with conjugated properties,and we studied the different properties of the synthesized MOFs with different metals.1.Due to insufficient research on the design of three-dimensional ligands for metal-organic frame materials,in order to improve the conductivity of three-dimensional MOF materials,we designed and successfully synthesized conjugated saddle-shaped three-dimensional organic ligand COTh P-COOH through a four-step synthesis method.The synthesis of the ligand was successfully demonstrated by NMR,high-resolution mass spectrometry,stroma-assisted laser analytic tandem time-of-flight mass spectrometry,etc.In addition,Cu-MOF material was synthesized by hydrothermal synthesis with copper nitrate.The synthesis of Cu-MOF was successfully proved through the characterization of single crystal X-ray diffraction,powder X-ray diffraction a,Fourier transform infrared spectrum.A wide and strong absorption peak was found in the near infrared through the solid-state UV-visible infrared absorption spectrum.In the future,it may be used in photothermal conversion.Finally,the conductivity is studied,and it is found that the conductivity is 0.002 nS cm^-1.2.We synthesized the COTh P-COOH ligand,which has the aggregation-induced emission（AIE）effect,and synthesized two kinds of MOF materials（Zn-MOF and Cd-MOF）by coordinating with different metals.A series of characterization methods proved that the two materials were indeed synthesized with metal coordination.In addition,the fluorescence enhancement effect of metal coordination effect is better than that of solid aggregation-induced luminescence effect.In addition,fluorescence detection can also be carried out by dispersing it in solution,which is not feasible for aggregation-induced luminescence materials,because MOF materials will not dissolve in most organic solvents,and the coordination bond of MOF materials will not break after dispersing in solvents.Therefore,it can be dispersed in organic solvent for fluorescence detection.Here,we selected Cd-MOF with high fluorescence intensity and found that it can specifically detect iron ion and 2,6-dinitrophenol.