Tailoring Phosphonium Ionic Liquids for a Liquid-Liquid Phase Transition.

ABSTRACT: The existence of more than one liquid state in a single-component system remains the most intriguing physical phenomenon. Herein, we explore the effect of cation self-assembly on ion dynamics in the vicinity of liquid-liquid and liquid-glass transition of tetraalkyl phosphonium ([P_mmm,n]⁺, m = 4, 6; n = 2-14) ionic liquids. We found that nonpolar local domains formed by 14-carbon alkyl chains are crucial in obtaining two supercooled states of different dynamics within a single ionic liquid. Although the nano-ordering, confirmed by Raman spectroscopy, still occurs for shorter alkyl chains (m = 6, n < 14), it does not bring calorimetric evidence of LLT. Instead, it results in peculiar behavior of ion dynamics near the liquid-gla

SUBMITTER: Yao B 

PROVIDER: S-EPMC10068824 | biostudies-literature | 2023 Mar

REPOSITORIES: biostudies-literature