Add time:07/25/2019         Source:sciencedirect.com

The standard (po= 0.1 MPa) enthalpies of formation ΔfHmo(cr) at the temperatureT= 298.15 K were determined using static-bomb calorimetry for crystalline 5-methoxybenzofurazan (5MeOBFN), 5-methoxybenzofurazan-1-oxide (5MeOBFNO), 5-methylbenzofurazan-1-oxide (5MeBFNO), and 4-nitrobenzofurazan-1-oxide (4NO2BFNO); using rotating-bomb calorimetry for 5-chlorobenzofurazan-1-oxide (5ClBFNO). The standard enthalpies of sublimation ΔcrgHmoatT= 298.15 K were measured by microcalorimetry and, from the enthalpies of formation of the gaseous compounds, the dissociation enthalpiesDmoof the (N+−O−) dative covalent bonds were derived.ΔfHmo(cr)/(kJ·mol−1) ΔcrgHmo/(kJ·mol−1)Dmo(N–O)/(kJ·mol−1) 5MeOBFN 57.9±1.7 89.2±0.7 5MeOBFNO 52.3±3.3 96.0±1.6 248.0±3.7 5MeBFNO 175.2±1.8 92.2±1.2 249.8±3.2 5ClBFNO 193.5±1.8 81.2±1.8 244.1±3.5 4NO2BFNO 202.6±2.1 97.3±1.6 255.9±6.7The weighted mean value ofDmo(N–O)/(kJ·mol−1) in benzofurazan-1-oxide derivatives has been assessed as (249.9±0.6)/(kJ·mol−1).

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