Effect of proteinogenic amino acids l-serine/l-threonine on volumetric and acoustic behavior of aqueous 1-butyl-3-propyl imidazolium bromide at T = (288.15, 298.15, 308.15, 318.15) K

Abstract

In the present work, density ρ, speed of sound u and FT-IR studies of l-serine and l-threonine have been carried out in (0.01, 0.03 and 0.05) mol kg−1 of 1-butyl-3-propyl imidazolium bromide ([BPim][Br]) at different temperatures (288.15 K, 298.15 K, 308.15 K, 318.15 K) at experimental pressure p = 0.1 MPa. Based on the measured densities, different thermo physical parameters like apparent molar volume Vϕ (AMV), partial molar volume Vϕ0 (PMV) and standard partial molar volume of transfer ΔVϕ0 have been calculated whereas from data of speed of sound; apparent molar isentropic compression Kϕ,s, partial molar isentropic compression Kϕ,s0 and partial molar isentropic compression of transfer ΔKϕ,s0 have been depicted. Transfer parameters have also been calculated and used to compute the pair and triplet interaction coefficients. Infrared spectral studies have also been performed in order to verify the results obtained. The work is mainly focused on prediction of various interactions present in the ternary system consisting of amino acids (AAs), 1-butyl-3-propyl imidazolium bromide ([BPim][Br]) and water.