Standard vaporization enthalpies of 4-nitrobiphenyl and 1, 1′- biphenyl are obtained on an isothermal heat conducting Calvet microcalorimeter with an estimated accuracy of ≤ 1 per cent for the first time. Standard formation enthalpies of some biphenyl derivatives in state of gas are determined. The calculation scheme by a method by “a double difference” of formation enthalpies of aromatic radicals and bond dissociation energies is offered. Using fundamental equations of the chemical physics, the new calculation method is offered to determine the energies of reorganization of molecules fragments into radicals. Formation enthalpies of radicals, namely biphenyl-4-yl and 3-methylfurazan-4-yl, are determined. Reorganization energies of radicals and bond chemical energies have been calculated.
Enthalpies of formation and vaporization Method of calculation Radical Reorganization energy
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Orlov YD, Lebedev YA, Saifullin IS. Thermochemistry of organic free radicals. Moscow: Nauka; 2001. p. 304.Google Scholar
Luo Y. Comprehensive handbook of chemical bond energies. Boca Raton: CRC Press; 2007. p. 1655.CrossRefGoogle Scholar
Pedley JB, Nailor RD, Kirby CP. Thermochemical data of organic compounds. New York: Chapman and Hall; 1986. p. 792.CrossRefGoogle Scholar
Semenov NN. On some problems of chemical kinetics and reactivity. Moscow: Acad Sci USSR; 1958. p. 686.Google Scholar
Pashchenko LL, Miroshnichenko EA. Thermodynamics of vaporization of 3-isopropylbiphenyl. J Therm Anal Calorim. 2015;120:1375–81.CrossRefGoogle Scholar
Sieranski T, Kruszynski R. Magnesium sulphate complexes with hexamethylenetetramine and 1, 10–phenanthroline. J Therm Anal Calorim. 2012;109:141–52.CrossRefGoogle Scholar