Synthesis Of Porous Organic Polymer And Their Fluorescent Sensing And Adsorption Properties

With the development of society,a lot of environmental problems such as water pollution,atmospheric pollution,nuclear waste pollution,global warming,and greenhouse effect have emerged in the world.Porous Organic Polymers（POPs）have become a research hot-spot due to their high surface area,relatively light weight,structural adjustable,and excellent properties.In this paper,we designed two type of porous organic polymers and characterized the structures of two type of materials.Furthermore,one of them was applied to fluorescent sensing to Fe³⁺,another one was applied to carbon dioxide adsorption and iodine capture.In chapter three,a triphenylamine-functionalized covalent organic polymer（TPA-COP）wassynthesizedbythepalladium-catalyzedSonogashira polycondensationreactionfromtris（4-ethynylphenyl）amineand4-bromo-N-（4-bromo-2-methoxybenzylidene）-2-methoxyaniline.Theobtained polymer possessed amorphous structure and good thermal stability exhibited strong yellow-green luminescence with an emission band at 498 nm.It is worth noting that the polymer also showed selective turn-on fluorescent response to Fe³⁺ion over a variety of other competing metal ions such as Na⁺,K⁺,Ca²⁺,Mg²⁺,Ba²⁺,Mn²⁺,Cr³⁺,Cu²⁺,Ni²⁺,Zn²⁺,Co²⁺,Al³⁺.The fluorescent detection limit of TPA-COP sensor for Fe³⁺in solution was 4.3×10^-77 M.Furthermore,the proposed sensing mechanism should result from complexation between tridentate-coordinated shiff base sites and Fe³⁺ion,which was further investigated by ¹H NMR and IR measures,together with fluorescence lifetime analysis.In chapter four,two acetal-linked porous organic polymer（APOP-1,APOP-2）were synthesized by p-toluenesulfonicacid catalyzed acetalization from1,3,5-tris（3’-tert-butyl-4’-hydroxy-5’-methylol）benzeneseparately1,4-phthalaldehydeand2,5-dimethoxy-1,4-phthalaldehyde,andthen investigated by carbon dioxide adsorption and iodine capture studies to APOP-1.The largepore size and high connectivity of the building blocks resulted in APOP-1 possessed amorphous structure and also exhibited excellent thermal stability.Besides,the APOP-1 also displays respectable CO₂ uptake(273 K1bar,8.57%;298K 1bar,5.37%,Q_stt value was 34 kJ/mol)and iodine capture capacity（350K,iodine vapor adsorption value was 220%）.