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Enthalpies of combustion of 5-methoxybenzofurazan, 5-methoxybenzofurazan-1-oxide, 5-methylbenzofurazan-1-oxide, 5-chlorobenzofurazan-1-oxide and 4-nitro-benzofurazan-1-oxide: the dissociation enthalpies of the N–O bonds

✍ Scribed by W.E. Acree Jr.; S.G. Bott; Sheryl A. Tucker; Maria D.M.C. Ribeiro da Silva; M.Agostinha R. Matos; G. Pilcher

Publisher
Elsevier Science
Year
1996
Tongue
English
Weight
362 KB
Volume
28
Category
Article
ISSN
0021-9614

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✦ Synopsis

The standard (p°=0.1 MPa) enthalpies of formation DfH°m(cr) at the temperature T=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 D g cr H°m at T=298.15 K were measured by microcalorimetry and, from the enthalpies of formation of the gaseous compounds, the dissociation enthalpies D°m of the (N + -O -) dative covalent bonds were derived.

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