Construction And Properties Of Luminescent Metal Organic Frameworks Based 1,1,2,2-tetraphenylethene

The luminescent metal organic frame material has the advantages of both inorganic materials and organic materials,and has been widely explored and applied in the fields of lighting,display,sensing and optical devices.In this paper,an organic main ligand1,1,2,2-tetrakis（4-（1H-imidazol-1-yl）phenyl）ethene（tipe）was synthesized,based on tetrastyrene with AIE effect,and its molecular structure was determined through Mass Spectrometry,nuclear magnetic and fluorescence tests.Then,a series of fluorescent MOFs were obtained by solvothermal method using tipe as the main ligand.1.MOF-1,MOF-2 and MOF-3 were synthesized through tipe,4,4’-H₂bpodc（4,4’-dicarboxybenzophenone）,4,4’-H₂oba（4,4-diphenyl ether dicarboxylic acid）,4,4’-H₂bcpf（4,4’-sulfonyl dibenzoic acid）and Zn（NO₃）₂·6H₂O.And their structures were determined by single crystal X-ray diffraction test.Fluorescence tests show that the light-emitting regions of the three zinc-based MOFs are in the blue region.And the largest emission peaks are 495 nm,476 nm and 470 nm.They are stable in most organic solvents.MOF-1 and MOF-2 have higher detection sensitivity for metal ions(Fe³⁺,Cr³⁺,Cr₂O₇^2-and Cr O₄^2-),In addition,MOF-1 has higher selectivity and sensitivity than MOF-2.2.MOF-4,MOF-5 and MOF-6 were synthesized through tipe,4,4’-H₂bpodc（4,4’-dicarboxybenzophenone）,4,4’-H₂bpdc（4,4’-biphthalic acid）,2,6-ndc（2,6-naphthalene dicarboxylic acid）and metal ions（Cd（Cl O₄）₂?6H₂O and Cd（NO₃）₂·4H₂O）.The structures were determined by single crystal X-ray diffraction.Fluorescence tests show that the light-emitting regions of the three cadmium-based MOFs are in the blue region.And the largest emission peaks are 502,480 and 490 nm.MOF-4 and MOF-5 are stable in most organic solvents,they have higher detection sensitivity for metal ions(Fe³⁺and Cr₂O₇^2-),MOF-5 has higher selectivity and sensitivity than MOF-4 for Fe³⁺.Moreover,The selectivity and sensitivity of MOF-4 is higher than MOF-5 for Cr₂O₇^2-.3.MOF-7 and MOF-8 were synthesized through tipe,4,4’-H₂bpdc（4,4’-biphthalic acid）and 4,4’-H₂bcpf（4,4’-sulfonyl dibenzoic acid）and Co Cl₂·6（H₂O）.The structures were determined by single crystal X-ray diffraction.Fluorescence tests show that the light-emitting regions of the two cobalt-based MOFs are in the blue region,And the largest emission peaks are 436 nm and 434 nm.MOF-7 is stable in most organic solvents,and the structure of MOF-8 collapses in these low-boiling solvents.