Solute–solvent interactions in 2,4-dihydroxyacetophenone isonicotinoylhydrazone solutions in N,N-dimethylformamide and dimethyl sulfoxide at 298–313 K on ultrasonic and viscometric data

Abstract

The speed of sound (u), density (ρ), and viscosity (η) of 2,4-dihydroxyacetophenone isonicotinoylhydrazone (DHAIH) have been measured in N,N-dimethyl formamide and dimethyl sulfoxide at equidistance temperatures 298.15, 303.15, 308.15, and 313.15 K. These data were used to calculate some important ultrasonic and thermodynamic parameters such as apparent molar volume (V_ϕs^st), apparent molar compressibility (K_ϕ), partial molar volume (V_ϕ⁰) and partial molar compressibility (K_ϕ⁰), were estimated by using the values of (V_ϕ⁰) and (K_ϕ), at infinite dilution. Partial molar expansion at infinite dilution, (ϕ_E⁰) has also been calculated from temperature dependence of partial molar volume V_ϕ⁰. The viscosity data have been analyzed using the Jones–Dole equation, and the viscosity, B coefficients are calculated. The activation free energy has been calculated from B coefficients and partial molar volume data. The results have been discussed in the term of solute–solvent interaction occurring in solutions and it was found that DHAIH acts as a structure maker in present systems.