Thermodynamic, ultrasonic and refractive index measurement of hydrazones in dimethylformamide at different temperatures

Department of Chemistry, Sant Gadge Baba Amravati University, Amravati-444 602, Maharashtra, India

E-mail : aswar2341@rediffmail.com

Manuscript received 17 October 2011, accepted 21 February 2012

Density (ρ), speed of sound (u), viscosity (ɳ) and refractive index (n_D) of 2-hydroxy-5-chloro-isonicotinoylhydrazone (HCAIH) and 2-hydroxy-5-methylisonicotinoylhydrazone (HMAIH) have been measured in N,N-dimethylformamide at temperatures 298.15, 303.15, 308.15 and 313.15 K. These measurements have been performed to evaluate some important thermodynamic, and acoustic parameters. The apparent molar volume (V_ɸ) and apparent molar compressibility (K_ɸ) of hydrazones in DMF were also calculated. Partial molar volume (V_ɸ⁰) and partial molar compressibility (K_ɸ⁰ ) were estimated by using the values of (V_ɸ) and (K_ɸ), at infinite dilution. The viscosity data have been analyzed using the Jones-Dole equation, and the viscosity B-coefficients are calculated. Refractive index data were used to calculate molar refractivity of solutions. The results have been discussed in the light of various types of interactions occurring in solution.