Does the active hydrogen atom in the hydantoin anion affect the physical properties, CO2 capture and conversion of ionic liquids?

The active hydrogen on the anion allows [P 4442 ][Hy] to be a potential CO 2 -responsive molecular switch, in contrast to its role on the cation. [P 4442 ] 2 [Hy] without active hydrogen on the anion shows good CO 2 capture and conversion.