基于电位测定盐和高疏水性离子液体混合物的具有低水溶解度和稳定液接电位的离子液体盐桥。

Ionic liquid salt bridge with low solubility of water and stable liquid junction potential based on a mixture of a potential-determining salt and a highly hydrophobic ionic liquid.

机构信息

Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan.

出版信息

Anal Chem. 2012 Apr 3;84(7):3461-4. doi: 10.1021/ac203425u. Epub 2012 Mar 16.

DOI:10.1021/ac203425u

PMID:22390786

Abstract

A new type of ionic liquid salt bridge (ILSB) based on a mixture of pentyltripropylammonium bis(pentafluoroethanesulfonyl)amide, [N(3335)(+)][C(2)C(2)N(-)], and heptadecafluorodecyltrioctylphosphonium tetrakis[3,5-bis(trifluoromethyl)phenyl]borate, [TOPH(+)][TFPB(-)], shows a stable phase-boundary potential (Δ(IL)(W)φ) between the ILSB and an aqueous solution of MCl (M = H(+), Li(+), Na(+), and K(+)) over the concentration range from 0.05 mM to 0.5 M with an averaged excursion in 1 h of ±0.3 mV. The reproducibility of Δ(IL)(W)φ is ±0.6 mV on average (95% confidence interval) in KCl solutions in this concentration range. The mixing of the two different types of salts not only increases the stability of the phase-boundary potential but provides us with more freedom in selecting potential-determining salts to design and customize ILSBs for different purposes.

摘要

一种新型的基于混合离子液体盐桥（ILSB），由五丙基三丙铵双（五氟乙烷磺酰基）酰胺，[N(3335)(+)][C(2)C(2)N(-)]，和十七氟癸基三辛基磷四[3,5-双（三氟甲基）苯基]硼酸，[TOPH(+)][TFPB(-)]组成，在 ILSB 和 MCl（M = H(+)，Li(+)，Na(+)和 K(+)）的水溶液之间表现出稳定的相界电位（Δ(IL)(W)φ），浓度范围从 0.05 mM 到 0.5 M，平均 1 小时内的偏移为±0.3 mV。在这个浓度范围内，在 KCl 溶液中，Δ(IL)(W)φ 的重现性平均为±0.6 mV（95%置信区间）。两种不同类型的盐的混合不仅增加了相界电位的稳定性，而且为我们提供了更多的自由来选择电位确定盐，以设计和定制用于不同目的的 ILSB。