Volumetric, Viscometric, and Refractive Index Behavior of 7‑Hydroxy-4-methylcoumarin in Aqueous Ethanol or 1‑Propanol Solutions in the Temperature Range of (293.15 to 313.15) K
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Abstract
Densities
and viscosities of the pseudo binary system 7-hydroxy-4-methylcoumarin
+ (ethanol or 1-propanol) + water at temperatures of (293.15, 298.15,
303.15, 308.15, and 313.15) K and refractive indices of this system
at <i>T</i> = 298.15 K have been measured as a function
of the molality of 7-hydroxy-4-methylcoumarin. The density data have
been used to compute the apparent molar volume and limiting partial
molar volume. The viscosity <i>B</i>-coefficients and variation
of <i>B</i> with temperature have been calculated from the
viscosity data according to the Jones–Dole equation. Molar
refractions of the investigated system have been obtained from the
refractive index data. These parameters and their variation tendencies
have been expounded in terms of the interactions between solutes and
solvents. The results have shown that 7-hydroxy-4-methylcoumarin plays
a structure-making role in the given solution