Synthesis And Properties Of 8-hydroxyquinoline-based Porous Materials

In recent years,the emerging porous organic materials have received extensive attention and further research by researchers.Compared with other materials,porous organic materials have great advantages,especially the ability to introduce corresponding functional groups into their functional sites according to specific application requirements,so as to achieve a variety of application goals of porous organic materials.In addition,8-hydroxyquinoline and its derivatives research also has been a hotspot in the field of photoelectric position,through the study of the structure of 8-hydroxyquinoline and its derivatives modified or its ligand with metal ions get 8-hydroxyquinoline funds belong to complexes can get luminous wavelength tunable,emitting light colors controlled organic light-emitting materials.In this context,two8-hydroxyquinoline-based organic porous materials were designed and prepared in this paper.Porous organic polymer of 8-hydroxyquinoline zinc was prepared by ligand 2,4,6-tris[2-(4-phenyl)vinyl-8-hydroxyquinoline]-1,3,5-triazine(TQVPTz)by two methods(grinding method and solid-liquid interface method)and metal zinc ion coordination.The ligand TQVPTz is synthesized by the reaction of p-cyanobenzaldehyde and2-methyl-8-hydroxyquinoline to the intermediate product 2-(4-phenylnitrile)vinyl-8-acetoxyquinoline,which is then obtained by cyanocyclization.The morphology of the porous materials was characterized by XRD powder diffraction,scanning electron microscopy test and transmission electron microscopy analysis test.The results show that the porous materials are all have ultra-thin layered structure.FT-IR spectra and¹H-NMR spectra were used to analyze the chemical composition and structure of the related substances.The test results confirmed the successful synthesis of the ligand TQVPTz,and further explained the successful preparation of 8-hydroxyquinoline zinc porous material.The TGA curve shows that the polymer material has good thermal stability.The pore properties of the two materials were analyzed by nitrogen adsorption and desorption analysis test.The results show that the two materials both have relatively large specific surface area of 30.990 m²g^-1.The pore size analysis shows that they are all porous materials.Through the study of the optical properties of these materials,it is found that due to the introduction of 8-hydroxyquinoline unit in the structure,they all have excellent luminescence properties.Similarly,the second 8-hydroxyquinolinyl conjugated porous polymer material TCz HQ was obtained by the reaction of 2,4,6-trichloro-1,3,5-triazine(TCT)with the designed and synthesized monomer 5-[(carbazole-9'-yl)methyl]-8-hydroxyquinoline(Cz HQ)in the presence of mesulfonic acid.Using the same characterization and testing method,the polymer material was found to be a porous material with a specific surface area of 11.803 m²g^-1.But unlike the first 8-hydroxyquinoline porous material,polymer TCz HQ also has excellent surface enhanced Raman scattering(SERS)effect.These test results show that the two organic porous materials synthesized in this paper will have great application potential in gas storage,adsorption,luminescence and other aspects.