Enthalpies of combustion of 2,2',4,4',6,6'-hexamethylazobenzene-N,N-dioxide, 2,2',6,6'-tetramethylazobenzene-N,N-dioxide, 2,4,6-trimethylnitrobenzene, and 2,6-dimethylnitrobenzene: the dissociation enthalpies of the N=N and N-O bonds

Article abstract of DOI:10.1006/jcht.1993.1124

The standard (p^o=0.1 MPa) molar enthalpies of combustion at the temperature T=298.15 K were measured by static-bomb calorimetry for crystalline 2,2',4,4',6,6'-hexamethylazobenzene-N,N-dioxide (HMABOO), 2,2',6,6'-tetramethylazobenzene-N,N-dioxide (TMABOO), 2,4,6-trimethylnitrobenzene (NITME), and liquid 2,6-dimethylnitrobenzene (NITXY).The enthalpies of sublimation at the temperature 298.15 K of HMABOO and TMABOO were assessed from vapour-pressure measurements; the enthalpy of sublimation of NITME and the enthalpy of vaporization of NITXY were measured by microcalorimetry.

.The standard molar enthalpies of decomposition of the crystalline N,N-dioxides to the corresponding gaseous monomeric nitroso-compounds at T=298.15 K were measured by microcalorimetry: for HMABOO, (18.1+/-2.5) kJ*mol^-1, and for TMABOO, (179.2+/-2.2) kJ*mol^-1.For HMABOO and TMABOO, D(N=N)/(kJ*mol^-1) was derived as (74.1+/-12.2) and (72.2+/-12.2), and /(kJ*mol^-1) as (285.7+/-6.8) and (287.8+/-6.6), respectively.D(N-O)/(kJ*mol^-1) in NITME and in NITXY was derived as (383.4+/-2.9) and (380.4+/-2.3), respectively.

Full text of DOI:10.1006/jcht.1993.1124

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