Synthesis Of Porous Organic Polymers With Imidazolyl Cation And Electrochemical Properties Of Imidazole Monomer

Carbon dioxide, the one of the major greenhouse gases which leads to the global warming climate change. Until now, the most effective way to control the concentration of carbon dioxide is CO2 capture and storage which defined as CCS technology. As a result, the studies about selective adsorption of carbon dioxide had received continuous attentions. Among the tremendous solid sorbents, porous solid adsorbent such as Zeolitic Imidazolate Frameworks (ZIFs), Metal Organic Frameworks (MOFs), Hypercross-linked Polymers (HCPs), Polymers of Intrinsic Microporosity (PIMs), Conjugated Microporous Polymers (CMPs) and Porous Organic Polymers (POPs) present attractive properties and become a hot topic.Actually, porous organic polymers that contain positive charges have the ability to adsorb acidic gases such as carbon dioxide, methane etc. Take imidazole compounds for example, the alkaline atoms from the imidazole rings could exactly provide the positive charges used to adsorb acidic gases. As a result, the imidazole compounds could be is a new type of material to capture CO2 and CH4.This paper mainly focuses on the synthesis of imidazole-based porous organic polymers, which have good adsorption selectivity to CO2 and CH4. To synthesize the imidazole contained monomer of DIB, TIB, TBB, TBN and TBM with a new method was the key. Then make the imidazole group react with benzyl group to form imidazolyl cations. Subsequently by the Azo reaction, Click reaction and Suzuki reaction, the porous organic polymers with imidazolyl cation could be prepared. Finally, the imidazole monomers and polymers were characterized by Brunauer-Emmet-Teller, IR, UV, 1H-NMR,13C-NMR analysis.The surface of the TBB center polymer synthesized by reaction of imidazole group and benzyl group is 4.84 m2 g-1, DIB/TIB center polymer surface area is 10.85 m2 g-1 and TIB center polymer surface area is 5.56 m2 g-1. Moreover, the TIB center polymer also showed good adsorption selectivity to carbon dioxide.Furthermore, the electrochemical properties of TBM, TIB, TBB, TBN and DIB were also studied. The results showed that the absorption peak of all the materials located in the ultraviolet band, and the peak distributed from left to right was TBM<DIB<TIB<TBB<TBN,and the intensity of absorption peak decreased as TBN>TBB>TIB>DIB>TBM. All the photoluminescence peaks were from 320 nm to 390 nm, and the full width at half maximum (FWHM) is 40-50 nm. Especially, the luminescence spectrum of TBB and TBN lie in blue-violet visible light region. Due to the widely used in fluorescent pigments, fluorescent proteins and bio-molecular probe areas, imidazole compounds could be a blue fluorescent material in the future.