The heat capacity of 2-iodo-3-nitrotoluene was precisely determined with a small sample precision automated adiabatic calorimeter over the temperature range from 79 to 373K. A phase transition from solid to liquid was observed at the peak temperature of (339.311±0.035)K. The molar enthalpy and entropy of the phase transition as well as chemical urity of the substance were determined to be (20677.54±40. 09)J·mol^-^1, (61.04±0.13)J·mol^-^1·K^-^1 and 99.73%, respectively, on the basis of the heat-capacity measurements. the further research of solid-liquid phase transition for this compound were carried out by means of DSC technique.

Key words: METHYLBENZENE P, NITROBENZENE P, SPECIFIC HEAT, THERMODYNAMIC PROPERTIES, DIFFERENTIAL SCANNING CALORIMETRY