Journal of the Serbian Chemical Society 2012 Volume 77, Issue 4, Pages: 507-521
https://doi.org/10.2298/JSC110712198R
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Volumetric, viscometric and optical study of molecular interactions in binary mixtures of diethyl malonate with ketones at 303.15, 308.15 and 313.15K
Rathnam Manapragada V. (Physical Chemistry Research Laboratory, B.N. Bandodkar College of Science, Thane, india)
Mohite Sudhir (Physical Chemistry Research Laboratory, B.N. Bandodkar College of Science, Thane, india)
Kumar Manapragada S. (Department of Chemistry, Zulal Bhilajirao Patil College, Deopur, Dhule, India)
Density ρ, viscosity η, and refractive index nD were measured for the binary
mixtures of diethyl malonate with ketones (acetophenone, cyclopentanone,
cyclohexanone and 3-pentanone) at temperatures (303.15, 308.15 and 313.15) K
over the entire composition range. Excess volume VE, deviation in viscosity
Δη, excess Gibb’s free energy of activation for viscous flow ΔGE and
deviation in molar refraction ÄR were determined from the experimental data
and computed results were fitted to the Redlich-Kister polynomial equation.
The values of VE, Δη, ΔGE, and ΔR were plotted against the mole fraction of
diethyl malonate. The observed positive and negative values of excess
parameters for all the studied binary mixtures were explained on the basis of
intermolecular interactions present in these mixtures. Further different
empirical relations were used to correlate the binary mixture viscosities and
refractive indices.
Keywords: density, diethyl malonate, ketones, molecular interactions, excess properties