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Singly or doubly bonded polynitrogen compounds can decompose to dinitrogen (N₂) with an extremely large energy release. This makes them attractive as potential explosives or propellants^,,, but also challenging to produce in a stable form. Polynitrogen materials containing nitrogen as the only element exist in the form of high-pressure polymeric phases^,,, but under ambient conditions even metastability is realized only in the presence of other elements that provide stabilization. An early example is the molecule phenylpentazole, with a five-membered all-nitrogen ring, which was first reported in the 1900s and characterized in the 1950s^,. Salts containing the azide anion (N₃⁻)^,, or pentazenium cation (N₅⁺) are also known, with compounds containing the pentazole anion, cyclo-N₅⁻, a more recent addition^,,. Very recently, a bulk material containing this species was reported and then used to prepare the first …