Density, Viscosity and Refraction Index of Aqueous Solutions of 7-Hydroxycoumarin and Ethanol or 1-Propanol at Temperatures from 293.15 to 313.15 K.

7-Hydroxycoumarin exhibits antioxidative, lipoxygenase inhibitive and anti-tumourigenic effects. Density and viscosity measurements have been carried out for the solutions of 7-hydroxycoumarin in mixture solvents of water and ethanol or 1-propanol at T = (293.15, 298.15, 303.15, 308.15 and 313.15) K. The measured data have been used to evaluate apparent molar volumes ( Vϕ), limiting apparent molar volumes ( $$ V_{\phi }^{0} $$ V ϕ 0 ), viscosity B-coefficients of the Jones–Dole equation and variation of B with temperature (d B/d T). The values of $$ V_{\phi }^{0} $$ V ϕ 0 and B-coefficients are positive and pass through their corresponding maxima at about 18 mol·kg −1 ethanol molality and 20 mol·kg −1 1-propanol molality, respectively. Besides, the values of $$ V_{\phi }^{0} $$ V ϕ 0 and B-coefficients decrease with increasing temperature. Molar refractive indices ( RD) of the ternary solutions at the temperature of 298.15 K have also been determined from measured refractive indices ( nD). There is an obvious increase of RD with increasing molality of the solvent. These parameters have been interpreted in terms of solute–solvent interactions and structure making/breaking ability of components in the aqueous solution. The temperature and concentration dependences of the weak interactions in the solution systems have also been discussed. [ABSTRACT FROM AUTHOR]