Interaction studies of methyl acetate in aqueous solutions of quinoxaline derivatives: effect of temperature and concentration

Abstract

The aim of the present work is to examine the effect of temperature and concentration on interactions of methyl acetate with aqueous solutions of quinoxaline derivatives using volumetric and acoustic properties. In addition to this, the density, ρ, and sound velocity, u, of methyl acetate in aqueous solutions of quinoxaline derivatives namely: (N-{− 3-[1-methanesulfonyl-5-(quinoxalin-6-yl)-4,5-dihydropyrazol-3-yl] phenyl} methane sulfonamide [MQDPMS]), N-{− 2-[1-acetyl-5-(quinoxalin-5-yl)-4, 5-dihydropyrazol-3-yl] phenyl} methane sulfonamide [AQDPMS], N-{− 2-[1-propanoyl-5-(quinoxalin-6-yl)-4,5-dihdro-1H-pyrazol-3-yl] phenyl} methane sulfonamide [2PQDPMS] and N-{− 3-[1-propanoyl-5-(quinoxalin-6-yl)-4,5-dihydro-1H-pyrazol-3-yl] phenyl} methane sulfonamide [3PQDPMS] have been measured at 293.15, 298.15, 303.15 and 308.15 K and at pressure p = 0.1 MPa. These data have been used to calculate the derived properties such as apparent molar volume, Vφ, and apparent molar adiabatic compressibility, kφ, for the mixtures. The standard partial molar volume, Vφ0, standard partial molar volume of transfer, ΔVφ0, standard partial molar adiabatic compressibility, kφ0, and standard partial molar adiabatic compressibility of transfer, Δkφ0, have been evaluated using Redlich–Mayer type equation. These results have been interpreted in terms of effect of temperature and concentration on interactions such as solute–solute, solute–solvent and solvent–solvent which exist in the mixtures. Furthermore, apparent molar expansivity, Eφ0, and Hepler's constant values, ∂2Vφ0/∂T2, have been evaluated to support the conclusions obtained from the volumetric and acoustic studies.