Ultrasonic and viscometric studies of substituted flavone, isoxazole and pyrazole in 70% acetone-water mixture

Abstract

Ultrasonic velocity and viscosity-density of 4'-methoxy-3-(p-methoxycinnamoyl) flavone (L₁), 3-(2-hydroxy-5-methylphenyl)-4-benzoyl-5-(<i style="mso-bidi-font-style:normal">p</i>-methoxyphenyl)isoxazole(L₂) and 3-(2-hydroxy-5-methylphenyl)-5-methylpyrazole (L₃) at different molalities in 70% (v/v) acetone-water mixture have been measured at 298.5±0.1 K. The values of relative viscosity (η_rel), apparent molal volume (ϕ_v) and adiabatic compressibility [ϕ_k(s)] have been deduced from these data. The structure making and breaking properties of the liquid have been considered as measure of solute-solvent and solute-solute interactions. The results of the present study suggest the presence of short range and weak interactions.