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High CO 2 absorption capacity by chemisorption at cations and anions in choline-based ionic liquids.

The effect of CO2 absorption on the aromaticity and hydrogen bonding in ionic liquids is investigated. Five different ionic liquids with choline based cations and aprotic N-heterocyclic anions were synthesized. Purity and structures of the synthesized ionic liquids were characterized by1 H and13 C NMR spectroscopy. CO2 capture performance was studied at 20 °C and 40 °C under three different pressures (1, 3, 6 bar). The IL [N1,1,6,2OH ][4-Triz] showed the highest CO2 capture capacity (28.6 wt%, 1.57 mol of CO2 per mol of the IL, 6.48 mol of CO2 per kg of the ionic liquid) at 20 °C and 1 bar. The high CO2 capture capacity of the [N1,1,6,2OH ][4-Triz] IL is due to the formation of carbonic acid (-OCO2 H) together with carbamate by participation of the -OH group of the [N1,1,6,2OH ]+ cation in the CO2 capture process. The structure of the adduct formed by CO2 reaction with the IL [N1,1,6,2OH ][4-Triz] was probed by using IR,13 C NMR and1 H-13 C HMBC NMR experiments utilizing13 C labeled CO2 gas.1 H and13 C PFG NMR studies were performed before and after CO2 absorption to explore the effect of cation-anion structures on the microscopic ion dynamics in ILs. The ionic mobility was significantly increased after CO2 reaction due to lowering of aromaticity in the case of ILs with aromatic N-heterocyclic anions.

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