Abstract
Development of task-specific ionic liquids (TSILs) with delicately designed chemical functionalities allow selective chemisorption of specific gas components for separation applications based on membrane or sorbent systems. The present study explored syntheses of various types of TSILs for biomimetic dioxygen binding for room-temperature air separation. IL ligands composed of different combinations of phosphonium-type cations [PC1C2C3C4]+ (C1 = C2 = C3 = 2, 4, or 6; C4 = 5, 8, or 16) and anions including N-methylglycinate ([NmGly]−) or/and bis(trifluoromethanesulfonyl)amide ([Tf2N]−) were synthesized and complexed with Co(II)salen to yield 11 TSIL samples. Material characterizations (NMR, CHN, FT-IR, and UV–vis) confirmed the formations of the expected material structures and the coordination bonds between IL ligands and Co(II) metal centers. The dioxygen sorption capacity and reversibility of the as-synthesized TSILs were investigated via both gravimetric and volumetric approaches under various gas sorpt...
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