Heat of combustion of some N-heterocycle compounds. Part 1

Abstract
The heats of combustion of triazole, indazole, 2,2′-bipyridine, and 2,2′- biquinoline are reported (1 328.9 ± 1.2, 3 778.6 ± 3.5, 5 285.5 ± 4.7, 9 049.4 ± 6.8 kJ mol–l, respectively). This leads to evaluation of heats of formation and atomisation. Allen-type resonance energies are also calculated and compared with those of similar compounds. 2,2′-Biquinoline exhibits a much smaller dihedral angle between the two quinoline rings than does bipyridine or biphenyl.

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