Synthesis And Properties Of Multifunctional Tetrazole Metal-Organic Frameworks

Metal-organic frameworks(MOFs),also known as coordination polymers,are porous organic-inorganic hybrid materials formed by the coordination of organic ligands and metal ions,having a wide range of applications in gas separation and storage,energy conversion,drug delivery,Luminescence,magnetism,sensing and catalysts.Because tetrazole organic ligands have various coordination modes,five-membered ring structure and high nitrogen content,the research of tetrazole MOFs has attracted the attention of many researchers in the past decade.In this paper,two kinds of multifunctional tetrazole ligands based on thiol and tetrastyrene were selected to synthesize five kinds of metal organic framework materials.The synthesis,structure and solid-state fluorescence of these five kinds of MOFs are studied,and three kinds of Cd(II)-MOFs materials with one-dimensional,two-dimensional and three-dimensional structures are studied about fluorescence-sensing properties in solvent small molecules,anions,cations and nitro groups.The first chapter is the introduction part,introduces the synthesis and influencing factors of metal organic framework materials and the advantages and research progress of tetrazole MOFs.In the second chapter,two kinds of multifunctional tetrazolium ligands were synthesized: ligand L1(9,9-diethyl-2,7-ditetrazole,short for H2EDT)and ligand L2(tetra-(4-tetrazole-benzene)ethylene,short for H4TTB).In the third chapter,ligand L1 was selected as the bridging ligand in MOFs to obtain three-dimensional Cd(II)MOF 1,one-dimensional Cd(II)MOF 2,one-dimensional Ni(II)MOF 3 and one-dimensional Cu(II)MOF 4.It was found that both MOF 1 and MOF 2 have a strong quenching response to PA and have the weakest detectability for aliphatic DMNB and NB with only one nitro group,respectively.In the fourth chapter,ligand L2 was selected as the bridging ligand to get a two-dimensional Cd(II)MOF 5.It is found that complex 5 can detect Co2+ and PA and the detection limit to the aromatic DMNB and the one-nitro-only NB is the same.In summary,five kinds of MOFs were synthesized through multi-functional tetrazole ligands L1 and L2,which not noly will help researchers synthesize specific organic ligands and MOFs,but also provide theoretical basis and experimental basis for the use of metal-organic framework materials as fluorescent probes.