Preparation And Properties Of 8-hydroxyquinoline Zinc Complex/Covalent Triazine Framework Materials

Metal-organic complexes and covalent organic frameworks are two popular materials in the field of new materials research.Most researchers are committed to the synthesis of metal organic complexes and covalent organic frameworks with unique structure and superior performance.In fact,these two materials have good applications in photochemistry,electrochemistry,photocatalysis and heterogeneous catalysis.For the study of metal organic complexes,8-hydroxyquinoline,as an organic ligand,shows excellent chelating properties and becomes one of the most used organic ligands in the synthesis of metal organic complexes.However,as far as 8-hydroxyquinoline metal complexes are concerned,the fluorescence color is mainly yellow green,and other colors are rarely reported,which are relatively single,and cannot meet the current requirements of luminescent materials.At present,the most used synthesis methods of 8-hydroxyquinoline zinc are solvothermal method and solid-phase method.These two methods have obvious disadvantages,such as time-consuming and labor-consuming solid-phase method,and unstable products;Solvothermal reaction temperature is very high,the product is easy to carbonize,and the reaction is easily affected by various factors,the product quality cannot be guaranteed.In addition,there are few studies on the construction and regulation of metal complexes with8-hydroxyquinoline ligands.Therefore,it is urgent to find a new method which can meet the requirements of mild reaction conditions,high purity,and stability of products,and prepare 8-hydroxyquinoline metal complexes with different luminescent colors,and realize the control of the morphology and properties of metal complexes.Based on the above research status,the first research in this thesis is to synthesize an orange emitting 8-hydroxyquinoline zinc complex Zn₃(L)₆ crystal by using the interface diffusion method which is rarely used at present.A new ligand 2-[2-(4-cyanophenyl)vinyl]-8-hydroxyquinoline(CVHQ)with stronger fluorescence has been synthesized from2-methyl-8-hydroxyquinoline by introducing styrene at its 2-position.The ligand has been coordinated with zinc ion to form Zn₃(L)₆ crystal via interfacial diffusion method.The experimental results show that the crystal emits orange light at with a photoluminescence peak at 600 nm.The electrochemical analysis shows that the crystal has low LUMO and HOMO energy levels,which are beneficial to electron injection and transmission.The crystal ca be potentially used as a luminescent material and electron transport material..The experimental results shows that the morphology and properties of CVHQ zinc complex can be controlled by adjusting the reaction method,reaction time,and CVHQ concentration.Since the advent of covalent triazine frameworks(CTFs)in 2008,many CTFs with unique structures and properties have been synthesized and widely applied in various fields.The pore sizes and properties of CTFs can be controlled by the sizes of monomers used.Three kinds of aromatic nitrile derivatives with different sizes are chosen as monomers,which are cyclotrimerized to form three CTFs by using super acid as catalysis.The experimental results show that the synthesized CTFs are crystal,one of which shows obvious surface enhanced Raman scattering(SERS)effect,indicating that the CTF material is expected to become a new type of SERS substrates.