Evaluating the contributions to conductivity in room temperature ionic liquids

被引：1

作者：

Simonis, Emily D. ^{[1
]}

Blanchard, G. J. ^{[1
]}

机构：

[1] Michigan State Univ, Dept Chem, 578 S Shaw Lane, E Lansing, MI 48824 USA

来源：

PHYSICAL CHEMISTRY CHEMICAL PHYSICS | 2024年 / 26卷 / 24期

关键词：

ALKYL CHAIN-LENGTH; FLUORESCENCE DEPOLARIZATION; ELECTRICAL-CONDUCTIVITY; DIFFUSION-COEFFICIENTS; 2D IR; DYNAMICS; NMR; 1-BUTYL-3-METHYLIMIDAZOLIUM; RELAXATION; MOTION;

D O I：

10.1039/d4cp01218f

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The conductivity of room temperature ionic liquids is not described adequately by the Nernst-Einstein equation, which accounts only for Brownian motion of the ions. We report on the conductivity of the ionic liquid 1-butyl-3-methylimidazolum bis(trifluoromethylsulfonyl) imide (BMIM TFSI), comparing the known conductivity of this RTIL to the diffusion constants of the cationic and anionic species over a range of length scales, using time-resolved fluorescence depolarization and fluorescence recovery after photobleaching (FRAP) measurements of chromophores in the RTIL. Our data demonstrate that the diffusional contribution to molar conductivity is ca. 50%. Another mechanism for the transmission of charged species in RTILs is responsible for the "excess" molar conductivity, and we consider possible contributions. The conductivity of room temperature ionic liquids is not described adequately by the Nernst-Einstein equation, which accounts only for Brownian motion of the ions.

引用

页码：17048 / 17056

页数：9

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