Imidazolinium based porous hypercrosslinked ionic polymers for efficient CO₂ capture and fixation with epoxides

Abstract

2-Phenylimidazoline based porous hypercrosslinked ionic polymers afforded high yields in the cycloaddition of epoxides with ambient or diluted CO2 (0.15 bar CO2 and 0.85 bar N2) under low or room temperature.

Imidazolium‐Functionalized Ionic Hypercrosslinked Porous Polymers for Efficient Synthesis of Cyclic Carbonates from Simulated Flue Gas

“…In addition, we performed the I C2 HCP‐5b‐catalyzed CO 2 cycloaddition with one typical epoxide, glycidyl phenyl ether, under mild conditions (atmospheric pressure and relatively low temperature of 90 °C). As shown in Table S7 in the Supporting Information, the yield was 81 % in the coupling of atmospheric CO 2 with glycidyl phenyl ether (entry 1), with a relatively large TON of 405 in comparison with previous systems under similar conditions . Cycloaddition of diluted CO 2 (0.15 bar) with glycidyl phenyl ether gave a moderate yield of 46 %, which increased to 80 % (TON: 400) and 90 % (TON: 450) in the presence of ZnCl 2 and ZnBr 2 , respectively.…”

“…Their porosities were measured by N 2 sorption. The rapid uptakes at a low relative pressure ( P / P 0 <0.03) is related to the micropores, whereas the continuous increasing uptake at higher relative pressures is derived from the mesopores (Figure S2 in the Supporting Information) . Table S2 in the Supporting Information shows that these polymers have high surface areas of 360–722 m 2 g −1 and large pore volumes (0.35–0.65 cm 3 g −1 ).…”

“…In general, the ionic HCPs were prepared through either direct copolymerization or post‐modification; the former benefits from simplified steps and gives a high dispersion of ionic moieties . However, hypercrosslinking by Friedel–Crafts alkylation involves an electrophilic attack step, making it difficult to copolymerize these monomers with electron‐withdrawing groups such as N‐heterocyclic cations of ILs . In this sense, we herein chose a series of benzylimidazole salts as the ionic monomers, in which the phenyl ring is linked by methylene with imidazolium cations.…”

Synthesis and evaluation of N, O‐doped hypercrosslinked polymers and their performance in CO2 capture

“…This is due to the interaction between polar phenolic hydroxyl groups and CO 2 molecules. Imidazolinium based porous hypercrosslinked ionic polymer possesses CO 2 uptake capacity of 2.4 mmol/g, but its BET specific surface area is only 667 m 2 /g . A large number of studies have shown that introducing N, Si, O and other heteroatoms into the construction unit can effectively enhance the interaction between the adsorbent and the gas, thus greatly improving the adsorption properties of the material for CO 2.…”

Environmentally benign and diastereoselective synthesis of 2,4,5-trisubstituted-2-imidazolines

“…1 Several pharmaceutical compounds that contain a 2-imidazoline ring have been synthesised and studied for blood pressure control, hyperglycemia, depression and schizophrenia. 2 Imidazolines and imidazolinium ions have been used as surfactants, 3 ionic liquids, 4 ionic polymers, 5 and in the eld of coordination chemistry and catalysis. [6][7][8][9][10] Among the 2-imidazoline derivatives, 2,4,5-triaryl imidazolines (also called amarines) have been gaining increased interest because their hydrolysis provides 1,2-diaryl-1,2-diaminoethanes featuring a C 2 -symmetric structure, important in catalysis.…”