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

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

Chemphyschem : a European journal of chemical physics and physical chemistry (2014-08-26)

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

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.

MATERIALS

Product Number

Brand

Product Description

Sigma-Aldrich

2-Pyrrolidinone, ≥99%

Supelco

Dimethyl sulfoxide, analytical standard

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Dimethyl sulfoxide, anhydrous, ≥99.9%

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2-Pyrrolidinone, 99%

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8-Octanoyloxypyrene-1,3,6-trisulfonic acid trisodium salt, suitable for fluorescence, ≥90% (HPCE)

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2-Propanol, anhydrous, 99.5%

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2-Propanol, BioUltra, for molecular biology, ≥99.5% (GC)

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Ethanol, tested according to Ph. Eur.

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Methanol-¹²C, 99.95 atom % ¹²C

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1-Ethyl-3-methylimidazolium diethyl phosphate, ≥97% (HPLC)

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1-Ethyl-3-methylimidazolium diethyl phosphate, ≥98.0%

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2-Propanol, HPLC Plus, for HPLC, GC, and residue analysis, 99.9%, poly coated bottles

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2-Propanol, BioReagent, for molecular biology, ≥99.5%

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2-Propanol, puriss. p.a., ACS reagent, ≥99.8% (GC)

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2-Propanol, ACS reagent, ≥99.5%

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Ethyl alcohol, Pure, 200 proof, meets USP testing specifications

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2-Propanol, puriss. p.a., ACS reagent, reag. ISO, reag. Ph. Eur., ≥99.8% (GC)

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Ethyl alcohol, Pure, 200 proof, ACS reagent, ≥99.5%

Sigma-Aldrich

2-Propanol, puriss., meets analytical specification of Ph. Eur., BP, USP, ≥99.5% (GC)

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2-Propanol, HPLC Plus, for HPLC, GC, and residue analysis, 99.9%

Dimethyl sulfoxide, European Pharmacopoeia (EP) Reference Standard