THERMOCHEMISTRY OF NITRO-COMPOUNDS - EXPERIMENTAL STANDARD ENTHALPIESOF FORMATION AND IMPROVED GROUP-ADDITIVITY VALUES

The standard molar enthalpies of vaporization Delta(vap)H(0) or sublim ation Delta(sub)H(0) of 1-nitropentane A, nitrocyclohexane B, 2,4,4-tr imethyl-2-nitropentane C, 3-nitro-3-(p-nitrophenyl)-pentane D, 1,4-din itrobenzene E, 1,2-dinitrobenzene F, and 2-amino-nitrobenzene G were o btained from the temperature variation of the vapour pressure measured in a flow system. The standard enthalpies of formation Delta(f)H(0) ( 1 or cr) at the temperature T=298.15 K were measured using combustion calorimetry for compounds B, C and D. The derived ideal-gas enthalpies of formation of the compounds of A-G and the data available from the literature were used for the calculation of group-additivity parameter s useful in the application of the Benson correlation. (C) 1997 Elsevi er Science B.V.