7:1 to nitrogen! Diazotization and subsequent dimerization of the triaminoguanidinium cation gave 1-diazidocarbamoyl-5-azidotetrazole (see picture). The structurally and spectroscopically characterized binary CN compound shows great energetic performance and a high heat of formation, but also extremely high sensitivity to friction and shock.
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Klapötke et al. (2011) studied this question.
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