Anion exchange: a novel way of preparing hierarchical porous structure in poly(ionic liquid)s

Abstract

The exchange of bulky salicylate and its dimers/clusters in PILs by other smaller anions increased specific surface area and fabricated a hierarchical porous structure.

Zinc Imine Polyhedral Oligomeric Silsesquioxane as a Quattro‐Site Catalyst for the Synthesis of Cyclic Carbonates from Epoxides and Low‐Pressure CO2

“…To determine isolated yields, following the reaction the mixture was purified by means of flash chromatography ( n ‐hexane/EtOAc (3:1) for entries 1–3, 5, and 6, hexane/EtOAc (1:1) for entries 4 and 7). Cyclic carbonates were characterized in accordance with literature data [92, 93] …”

Swelling Poly (Ionic Liquid)s: Heterogeneous Catalysts That are Superior than Homogeneous Catalyst for Ethylene Carbonate Transformation

“…The adsorption peaks of imidazolium ring skeleton were found at 1567 and 1550 cm −1 , and C–N stretching bands of imidazolium ring were found at 1162 cm −1 . The appearance of two major peaks at 1580 and 1413 cm −1 in P[VBIM][OAc]‐10%, which were assigned to carboxylate group and C−H bending vibrations in acetate group, clearly suggested that the Br − had replaced by acetate group . Other PILs with different 3‐substituents and cross‐linker density showed analogous characteristic peaks (Figure S2 and S3 in the Supporting Information).…”

Designing Explosive Poly(Ionic Liquid)s as Novel Energetic Polymers

“…Subsequently, the 3‐[2‐(nitrooxy)ethyl]‐1‐vinylimidazolium bromide, AIBN (0.164 g, 1.0 mmol), and methanol (17 mL) were charged into a Schlenk flask equipped with a magnetic stirrer, and the mixture was refluxed under nitrogen for 24 h. After polymerization, the polymers were cooled to room temperature, washed with ethyl acetate and methanol, and dried under vacuum to afford poly{3‐[2‐(nitrooxy)ethyl]‐1‐vinylimidazolium bromide} in 77 % yield. Anion‐exchange reactions were carried out according to the literature procedure with a minor modification …”

“…After the reaction mixture was stirred for 0.5 h, the precipitate was collected by centrifugation, washed with distilled water and dried under vacuum to affordt he E-PIL-H-3 in 42 %yield. [25] Poly{3-[2-(nitrooxy)ethyl]-1-vinylimidazolium bromide} (1.315 g, 5mmol based on monomer) was added to as aturated aqueous solution of sodium nitrate (15 mL). After stirring the reaction mixture for 24 h, the precipitate was collected by filtration and was then was added to af resh saturated aqueous solution of sodium nitrate (15 mL).…”