Densities
of aqueous solutions of glycine, l-alanine, l-arginine,
and l-phenylalanine containing 1-ethyl-3-methylimidazolium
bromide, [EMIm]Br, have been determined at T = (298.15
and 308.15) K. From the experimental density data, the apparent molar
volumes (V
Φ) and the standard partial
molar volumes (V
Φ
0) at
(298.15 and 308.15) K have been calculated. The values of standard
partial molar volumes of transfer (Δtr
V
Φ
0) are also obtained and are negative
for glycine, l-alanine, and l-phenylalanine while
positive for l-arginine. The Δtr
V
Φ
0 values all increased with
the increase of the temperature and also the [EMIm]Br content. The
obtained volumetric parameters will be helpful to understand mixing
effects and other complex biological processes between head and side
chain groups of amino acids and ionic liquid [EMIm]Br in aqueous solution.
Eco-friendly [HSO3-pmim]+(1/2Zn2+)SO42− ionic liquid catalysts facilitates synergistic Brønsted and Lewis acidity for esterification of n-caprylic acid to methyl caprylate.
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