Construction And Properties Study Of Covalent Organic Polymers Based On BODIPY

Covalent organic polymers(COPs)consist of organic molecule units through covalent bonds.They own outstanding properties,such as designable units,adjustable structures,various synthetic methods,functional modifications and high stabilities.They have been widely used in gas adsorption and storage,optoelectronic devices,catalytic applications,fluorescent probes and other different fields.In this project,a photophysical stable fluorescent dye Boron dipyrromethene(BODIPY)with large ?conjugated system is selected as a building block.It forms covalent organic polymers with porphyrin molecules and tetraphenylethylene molecules via covalent bonds respectively.The structures and photophysical properties of polymers have been studied.The main work of each chapter are as follows:Chapter 1 traces the research progress of covalent organic polymers in terms of material design principles,synthetic methods,characterization methods,and applications.In addition,the organic units BODIPY,porphyrin and tetraphenylethylene in this proj ect are briefly introduced.Chapter 2 describes two D-A type covalent organic polymers BTH and BTA,which consist of P-formyl-BODIPY and tetrakis(4-hydrazidocarbonylphenyl)porphyrin and tetra(4-aminophenyl)porphyrin by hydrazone bonds and imine bonds,respectively.The basic structural characterizations of the two polymers are firstly performed.Solid-state nuclear magnetic carbon spectra and infrared spectra show that the reactants were completely reacted and the targeted product were synthesized.X-ray diffraction shows that no crystalline materials were obtained because of the effect of different reaction conditions.After the basic characterizations,the isothermal adsorption curves show the specific surface area and pore differences of the two materials.Scanning electron microscopy and thermogravimetric curve characterize the morphology and the good thermal stability.Finally,the photophysical and photochemical properties of polymers are studied.The results show that covalent organic polymers composed of two photosensitizers have wide absorption wavelength and excellent photosensitizing perfonnance.Chapter 3 introduces a "4+2" type covalent organic polymer BTP,consisting of?-formyl-BODIPY and tetrakis(4-aminophenyl)ethylene by imine bonds via solvothermal synthetic method.After basic structural characterization of X-ray diffraction,solid-state nuclear magnetic resonance and nitrogen gas adsorption desorption,we have also found that BTP exhibits great thermal stability and solvent-resistant chemical stability.Photophysical studies have shown that the material composed of tetrakis(4-aminophenyl)ethylene with the aggregation-induced luminescence property and BODIPY is not capable of aggregating light emission.Photochemical studies have shown that polymer has the ability to produce singlet oxygen and material can be recycled for using because it is stable.