ENTHALPIES OF COMBUSTION OF PHENAZINE N-OXIDE, PHENAZINE, BENZOFUROXAN, AND BENZOFURAZAN - THE DISSOCIATION ENTHALPIES OF THE (N-O) BONDS

The standard (po = 0.1 MPa) molar enthalpies of combustion at 298.15 K were measured by static-bomb calorimetry and the standard molar enthalpies of sublimation at 298.15 K were measured by microcalorimetry for phenazine, benzofurazan, and their corresponding N-oxides: {A table is presented}. From the standard molar enthalpies of formation of the gaseous compounds, the molar dissociation enthalpies of the (NO) bonds werederived: D(NO)/(kJ · mol-1): phenazine N-oxide, 280.7 ± 5.6; benzofuroxan, 250.9 ± 3.0. © 1990.