The standard (p degrees = 0.1 MPa) molar enthalpies of combustion, Delta H-c degrees(m), for the 3- and 4-nitrobenzophenones and for the 3,3'-dinitrobenzophenone, in the crystalline state, were determined, at the temperature T = 298.15 K, using a static bomb combustion calorimeter. For these compounds, the standard molar enthalpies of sublimation, Delta H-g(cr)degrees(m), at T=298.15 K. were determined by Calvet microcalorimetry. For the 3- and 4-nitrobenzophenones the vapour pressures as function of temperature were measured by the Knudsen effusion technique and the standard molar enthalpies of sublimation, Delta H-g(cr)degrees(m) at T = 298.15 K. were derived by the Clausius-Clapeyron equation. The results are as follows: [GRAPHICS] These values were used to derive the standard molar enthalpies of formation of the compounds in their condensed and gaseous phases, respectively. For 3- and 4-nitrobenzophenones, the standard (P degrees = 0.1 MPa) molar enthalpies, entropies and Gibbs functions of sublimation, at T=298.15 K, were derived. The derived standard molar enthalpies of formation in the gaseous state are analysed in terms of structural enthalpic increments. (C) 2010 Elsevier Ltd. All rights reserved.