Densities and ultrasonic speed of 2-hydroxy-5-methyl-3-nitro acetophenone in N,N-dimethylformamide at different temperatures

Density, ultrasonic speed measurements have been made for 2-hydroxy-5-methyl-3-nitroacetophenone (HMNAP) (0.06-0.21 mol.kg-1) in N,N-dimethylformamide (DMF) at four equidistant temperatures: 298.15, 303.15, 308.15 and 313.15 K. These measurements have been used to evaluate some important thermodynamic and acoustic parameters, such as apparent molar volume, limiting apparent molar volume, adiabatic compressibility, apparent molar adiabatic compressibility, limiting apparent molar adiabatic compressibility. The apparent molar volume (Vf) and apparent molar adiabatic compressibility (Ks,f), were computed using density data. These parameters, were used to discuss interactions between the ketonic (>CO) group and DMF molecule. The results are interpreted to gain insight in to the changes in molecular association equilibria and structural effects in these systems. KEY WORDS: Density, Ultrasonic speed, Adiabatic compressibility, Acetophenone, Molecular interaction Bull. Chem. Soc. Ethiop. 2013, 27(1), 155-160. DOI: http://dx.doi.org/10.4314/bcse.v27i1.18