期刊
JOURNAL OF PHYSICAL CHEMISTRY B
卷 115, 期 19, 页码 6088-6099出版社
AMER CHEMICAL SOC
DOI: 10.1021/jp2012254
关键词
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资金
- Portuguese-French joint action [PESSOA-17753NF]
- Auvergne region, France
- FCT (Portugal) [PTDC/QUI-QUI/101794/2008, PTDC/-QUI/71331/2006, PTDC/QUI/66826/2006]
- NMR spectrometers [REDE/1517/RMN/2005]
- FEDER
- Fundacao para a Ciencia e a Tecnologia (FCT)
- [SFRH/BPD/34146/2006]
- Fundação para a Ciência e a Tecnologia [PTDC/QUI/66826/2006, SFRH/BPD/34146/2006] Funding Source: FCT
In this study, we have focused on binary mixtures composed of 1-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)-imide, [C(4)C(1)im][Ntf(2)], and a selection of six molecular components (acetonitrile, dichloromethane, methanol, 1-butanol, t-butanol, and water) varying in polarity, size, and isomerism. Two Kamlet-Taft parameters, the polarizability pi* and the hydrogen bond acceptor beta coefficient were determined by spectroscopic measurements. In most cases, the solvent power (dipolarity/polarizability) of the ionic liquid is only slightly modified by the presence of the molecular component unless large quantities of this component are present. The viscosity and electrical conductivity of these mixtures were measured as a function of composition and the relationship between these two properties were studied through Walden plot curves. The viscosity of the ionic liquid dramatically decreases with the addition of the molecular component. This decrease is not directly related to the volumetric properties of each mixture or its interactions. The conductivity presents a maximum as a function of the composition and, except for the case of water, the conductivity maxima decrease for more viscous systems. The Walden plots indicate enhanced ionic association as the ionic liquid gets more diluted, a situation that is the inverse of that usually found for conventional electrolyte solutions.
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