Dissociation energy of the N-NO bond in methylnitrosohydrazine

Thermochemical properties of three nitrosohydrazine derivatives, methylnitr osohydrazine, ethylenedinitrosohydrazine, and vinyl ether of nitrosohydrazi ne, are studied. The heats of combustion and enthalpies of formation of the se compounds are measured by means of combustion calorimetry. Their enthalp ies of formation in gas phase are assessed from their enthalpies of sublima tion measured with a Calvet microcalorimeter. The dissociation energy of th e nitroso group of methylnitrosohydrazine is estimated at 179.6 kJ/mol base d on the thermochemical data obtained. The contribution of the nitrosohydra zine fragment to the enthalpies of formation in condensed and gas states is assessed.