ИСТИНА

The enthalpies of formation and vaporization of some azido- and nitroaromatic derivatives were determined. A "double difference" method for calculating the enthalpies of formation of aromatic radicals and bond dissociation energies was proposed. The enthalpies of formation of radicals, a namely 4-nitro-biphenyl, azido- and azo-radicals were obtained. The energies of reorganization of these radicals as well as phenyl and 4, 3, and 2-pyridyls were determined.The energies of the chemical bonds were calculated.