Synthesis, Structure And Properties Of Metal–organic Frameworks Materials Based On Azole And Dicarboxylate Ligands

Metal–organic frameworks(MOFs), as a new class of highly ordered porous materials, have aroused extensive attention in the last 20 years. Their ultrahigh porosity, adjustable pore sizes and modifiable function groups, make them possessing potential applications in gas storage/separation, sensing, catalysis, luminescence and drug delivery. With the development of synthetic chemistry, numerous MOF materials with unique structures and captivating topological networks have been successfully synthesized, which establishes the foundation for targeted synthesis of MOFs with designed structures and properties. With the deepening of structure research, the exploitation of multiple functions of MOFs has become the focus of this research field. Therefore, rational design and synthesis of MOFs with fascinating structures and desired properties have a great significance in developing novel functional materials.In this work, we selected azole as multidentate N-donor ligands, and dicarboxylate ligands as co-ligand to construct novel MOFs materials under solvothermal conditions. Referring to our previous literature, we synthesized a three-dimensional fourfold interpenetrating metal-organic framework [Zn5(btz)6(bdc)2(H2O)2]·7DMA(1). Compound 1 not only displays high adsorption of CO2, the values are quite comparable to many typical MOFs, but also good capability to encapsulate Alq3(tris(8-hydro-xyquinoline)aluminum) chromophores to realize tunable luminescence by changing the concentrations of Alq3 solutions. Subsequently, we fortunately synthesized a novel compound [Cd3(bpea)2(trz)2(H2O)2]·DMF(2). Compound 2 is a fascinating 3D pillared-layer structure and shows the unique self-penetrating network with an unprecedented uninodal seven-connected 414.5.66 topology. It exhibits exceptional resistance to acid/base aqueous solutions and excellent solvent-dependent luminescence properties. Remarkably, it shows highly efficient luminescence enhancing and quenching response upon interaction with toluene and nitrobenzene, respectively.