Imidogen

Imidogen (systematically named λ-azane and hydridonitrogen), also called aminylene or nitrene, is and inorganic compound with the chemical formula NH (also written [NH]). Imidogen can be synthesized from an ammonia discharge; the resulting radicals are highly reactive and consequently short lived, but form an important part of radical chemistry. Imidogen is interesting in that it reacts differently depending on its spin multiplicity. Also, it has a triplet ground state. In sufficiently high concentrations, imidogen polymerizes to form triazidine that, without stabilizing substituents, is in itself only a metastable molecule.