| Due to the shortage of energy,the demand for new energy is becoming increasingly urgent.Therefore,it is of great significance to study portable energy storage and conversion devices.In addition,the presence of water has a significant effect on the results of the organic synthesis process,so a more effective method is needed to detect the water content in the organic solvent.Metal-organic framework materials?MOFs?have attracted much attention in the fields of gas storage and separation,fluorescence sensing,drug loading,and electrochemistry,owing to their high specific surface area,pore size and channel environment which can be designed and adjusted.In this paper,eight novel compounds were synthesized by solvothermal method using rigid tetracarboxylic acid ligands and transition/lanthanide metals.Three of these compounds were used to prepare MOF composites,which extended the application in supercapacitor and dual emission fluorescence detection.The specific results are as follows:1.The rigid ligand 3,3',5,5'-terphenyltetracarboxylic acid?1,3-db?and transition metal salt were constructed to obtain four compounds Ni2??2-O??1,3-db??H2O??1?,Co13??3-O??1,3-db?6?H2O?11?2?,Fe13??3-O??1,3-db?6?H2O?11?3?,Fe2?1,3-db?2?bpe??4?.The compound 1 is a three-dimensional structure of a?4,8?-connected scu topology consisted by butterfly-type tetranuclear nickel clusters.The compound 2 and 3 are isomorphic,which are athree-dimensional structures formed by trinuclear and penta-nuclear metal clusters.The compound 4 is a layered columnar three-dimensional structure supported by bpe ligand,and binuclear iron cluster as secondary building unit.The composites was designed by compound2?Co-MOF?with a certain proportion of polypyrrole.The network structure of polypyrrole provided a pathway for electron transport and enhances the conductivity of Co-MOF.At the current density of 1 A/g,the specific capacitance increased from 76.9 F/g to 324 F/g.At the current density of 0.5 A/g,the specific capacitance of compound 1?Ni-MOF?reached 553.95F/g,which reached a moderately high level compared to other single MOF supercapacitor materials,and a symmetrical solid-state supercapacitor device was assembled.Moreover,the device can be lit in series to illuminate a green LED bulb.2.Four compounds:[Eu3?1,3-db??H2O?2]·3H2O?5?,[Tb3?1,3-db?2?H2O?]·3H2O?6?,Zn2??2-O??1,3-db??7?,Zn2?1,3-db??H2O??8?were constructed by rigid ligands3,3',5,5'-terphenyltetracarboxylic acid and lanthanide/zinc metal salts.The compound 5 and 6formed a double-emission fluorescence ratio type composite Ln-MOF@N,S-CDs with N,S-CDs,respectively.The results showed that the compound 5?Eu-MOF?achieved the detection of trace water?water content less than 5%?,and the compound 6?Tb-MOF?realized the detection of a wide range of water?water content ranging from 0 to 100%?.The fluorescence quantum yield of 7 was up to 25.86%,and 8 was a case of a chiral compound with fluorescence induced by D-cam acid. |
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