Universität zu Köln

Kuzmin, O., Bordes, E., Schmauck, J., Hunt, P. A., Hallett, J. P. and Welton, T. (2016). Solubility of alkali metal halides in the ionic liquid [C(4)C(1)im][OTf]. Phys. Chem. Chem. Phys., 18 (24). S. 16161 - 16169. CAMBRIDGE: ROYAL SOC CHEMISTRY. ISSN 1463-9084

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Abstract

The solubilities of the metal halides LiF, LiCl, LiBr, LiI, NaF, NaCl, NaBr, NaI, KF, KCl, KBr, KI, RbCl, CsCl, CsI, were measured at temperatures ranging from 298.15 to 378.15 K in the ionic liquid 1-butyl-3-methylimidazolium trifluoromethanesulfonate ([C(4)C(1)im][OTf]). Li+, Na+ and K+ salts with anions matching the ionic liquid have also been investigated to determine how well these cations dissolve in [C(4)C(1)im][OTf]. This study compares the influence of metal cation and halide anion on the solubility of salts within this ionic liquid. The highest solubility found was for iodide salts, and the lowest solubility for the three fluoride salts. There is no outstanding difference in the solubility of salts with matching anions in comparison to halide salts. The experimental data were correlated employing several phase equilibria models, including ideal mixtures, van't Hoff, the lambda h (Buchowski) equation, the modified Apelblat equation, and the non-random two-liquid model (NRTL). It was found that the van't Hoff model gave the best correlation results. On the basis of the experimental data the thermodynamic dissolution parameters (Delta H, Delta S, and Delta G) were determined for the studied systems together with computed gas phase metathesis parameters. Dissolution depends on the energy difference between enthalpies of fusion and dissolution of the solute salt. This demonstrates that overcoming the lattice energy of the solid matrix is the key to the solubility of inorganic salts in ionic liquids.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Kuzmin, O. UNSPECIFIED UNSPECIFIED UNSPECIFIED Bordes, E. UNSPECIFIED UNSPECIFIED UNSPECIFIED Schmauck, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Hunt, P. A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Hallett, J. P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Welton, T. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-271998
DOI:	10.1039/c6cp02286c
Journal or Publication Title:	Phys. Chem. Chem. Phys.
Volume:	18
Number:	24
Page Range:	S. 16161 - 16169
Date:	2016
Publisher:	ROYAL SOC CHEMISTRY
Place of Publication:	CAMBRIDGE
ISSN:	1463-9084
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language SALTS; ELECTROLYTES; CHLORIDE; DISSOLUTION; BATTERIES; SOLVENTS Multiple languages Chemistry, Physical; Physics, Atomic, Molecular & Chemical Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/27199