Microscopic diffusion dynamics of silver complex-based room-temperature ionic liquids probed by quasielastic neutron scattering

Quasielastic neutron scattering is used to probe the microscopic diffusion dynamics of the hydrogen-bearing cations of two different silver complex-derived room-temperature ionic liquids, [Ag(propylamine)₂ ⁺][Tf₂N^-] (Tf=trifluoromethanesulfonyl) and [Ag(1-pentene)⁺][Tf₂N^-]. In the temperature range from 300 to 340 K, analysis of the scattering momentum transfer dependence of the data provides evidence for three distinct diffusion components. The slowest component describes the long-range cationic translational diffusion. A possible link between the microscopic diffusion parameters and the structural features of the cations comprising these two ionic liquids is discussed.