Determination of solubility parameters of ionic liquids and ionic liquid/solvent mixtures from intrinsic viscosity

Piyarat Weerachanchai; Yuewen Wong; Kok Hwa Lim; Timothy Thatt Yang Tan; Jong-Min Lee

doi:10.1002/cphc.201402345

Determination of solubility parameters of ionic liquids and ionic liquid/solvent mixtures from intrinsic viscosity

Chemphyschem. 2014 Nov 10;15(16):3580-91. doi: 10.1002/cphc.201402345. Epub 2014 Aug 21.

Authors

Piyarat Weerachanchai¹, Yuewen Wong, Kok Hwa Lim, Timothy Thatt Yang Tan, Jong-Min Lee

Affiliation

¹ School of Chemical and Biomedical Engineering, Nanyang Technological University, 62 Nanyang Drive, Singapore 637459 (Singapore), Tel.: (+65) 6513-8129.

PMID: 25145759
DOI: 10.1002/cphc.201402345

Abstract

The total and partial solubility parameters (dispersion, polar and hydrogen-bonding solubility parameters) of ten ionic liquids were determined. Intrinsic viscosity approaches were used that encompassed a one-dimensional method (1D-Method), and two different three-dimensional methods (3D-Method1 and 3D-Method2). The effect of solvent type, the dimethylacetamide (DMA) fraction in the ionic liquid, and dissolution temperature on solubility parameters were also investigated. For all types of effect, both the 1D-Method and 3D-Method2 present the same trend in the total solubility parameter. The partial solubility parameters are influenced by the cation and anion of the ionic liquid. Considering the effect on partial solubility parameters of the solvent type in the ionic liquid, it was observed that in both 3D methods, the dispersion and polar parameters of a 1-ethyl-3-methylimidazolium acetate/solvent (60:40 vol %) mixture tend to increase as the total solubility parameter of the solvent increases.

Keywords: hydrogen bonds; ion pairs; ionic liquids; noncovalent interactions; solvent effects.