Synthesis Of Nitrogenous Heterocyclic Compounds And Their Applications In The Development Of Organic Photoelectric Materials

Nitrogen-containing heterocyclic compounds are widely found in natural products,drugs and material molecules,and are an important class of compounds.How to design and synthesize useful nitrogen-containing heterocyclic compounds and apply them to luminescent materials has been the focus of attention.Although the design and synthesis of nitrogen-containing heterocyclic compounds have been more reported,but still can not meet the needs of current production life,so the thesis mainly focuses on the design and synthesis of nitrogen-containing heterocyclic compounds and their applications in organic optoelectronic materials,specifically divided into the following three parts:The first part investigated the synthesis of furanquinolines analogues of nitrogen-containing heterocyclic compounds with the participation of CO₂.In this part of work,a series of furanquinolines derivatives were synthesized in one step by a simple reaction system using CO₂as one of the reaction raw materials.The reactions have high yields and good applicability,and have good application prospects.The reaction mechanism is also proposed in conjunction with the relevant literature reports.The second part focuses on the development and performance testing of new thermally activated delayed fluorescence（TADF）materials containing furanquinoline structures.In this part,two TADF molecules,FRQL-1 and FRQL-2,were designed and synthesized with the furanquinoline structure as the electron acceptor in combination with the synthesis method developed above,and based on this,a series of characterizations（including thermogravimetric analysis,cyclic voltammetry,absorption spectra,emission spectra,theoretical calculations,etc.）were performed on the two material molecules,and the results showed that the luminescence range of both materials is in the blue light region The results show that both materials are expected to be used in the blue light region and photocatalysis in the future.In the third part,the design and synthesis of Carben-iridium complex with triazolium and its luminescent properties are studied.In this part,three precursors of carbene triazolium were designed and synthesized,and used as ligands to complexate with Ir（III）.Three iridium complexes were obtained:mer-5-TNIR,mer-6-TNIR and mer-7-TNIR.The three iridium compounds contain adipose rings of different sizes,and the emission peaks shift blue（417 nm,415 nm,and 413 nm）with the increase of adipose rings.On this basis,a series of properties of the molecules of the three materials were also characterized one by one（including thermogravimetric analysis,cyclic voltammetry,absorption spectrum,emission spectrum,theoretical calculation,etc.）.The characterization results indicate that they are expected to be applied in the deep blue light emitting materials in the future.In conclusion,in this paper,a series of nitrogen-containing heterocyclic compounds are designed,synthesized and characterized,and all of them are in the blue light range from the perspective of luminescence spectrum,which has broad application prospect.