Abstract
We report on the structure-dependence and magnitude of the induced free charge density gradient (ρf) seen in room-temperature ionic liquids (RTILs) with imidazolium and pyrrolidinium cations. We characterize the spatially-resolved rotational diffusion dynamics of a trace-level cationic chromophore to characterize ρf in three different pyrrolidinium RTILs and two imidazolium RTILs. Our data show that the magnitude of ρf depends primarily on the alkyl chain length of RTIL cation and the persistence length of ρf is independent of RTILs' cation structure. These findings collectively suggest that mesoscopic structure in RTILs plays a significant role in allowing charge density gradients to form.
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