Intradiffusion coefficients of acetylacetone (AcAc) and DMF/DMSO/benzene in binary systems over the entire concentration range at 303.15 K were determined by H-1 diffusion-order spectroscopy (DOSY) nuclear magnetic resonance (NMR) method based pulse field gradient (PFG). The densities and viscosities of the above three binary systems at 303.15 K were also studied and employed to calculate the excess molar volumes (V-E) and deviations in viscosity (Delta eta). Besides, experiments were carried out at 333.15 K for the system of AcAc + DMF. The solvent and temperature effect upon the difference in D between enol and keto tautomers, the tautomeric equilibrium and excess properties (V-E and Delta eta) were discussed as well. Isotherms of V-E as a function of mole fraction of AcAc (x(1)) show positive deviations in benzene but negative deviations in DMF and DMSO, whereas isotherms of Delta eta as a function of x(1) record positive deviations in DMF but negative in benzene and DMSO. V-E values show more negative and Delta eta values are less positive in the system of AcAc + DMF at 333.15 K compared to 303.15 K. The V-E and Delta eta were fitted to a Redlich-Kister type equation and the measured results were interpreted concerning molecular interactions in the solutions. (C) 2015 The Chemical Industry and Engineering Society of China, and Chemical Industry Press. All rights reserved.