Triazene is an unsaturated inorganic compound having the chemical formula N<sub>3</sub>H<sub>3</sub>. It has one double bond and is the second-simplest member of the azene class of hydronitrogen compounds, after diimide. Triazenes are a class of organic compounds containing the functional group âÂÂN(H)âÂÂN=NâÂÂ. Triazene, possibly along with its isomer triimide (HNNHNH), has been synthesized in electron-irradiated ices of ammonia and ammonia/dinitrogen and detected in the gas phase after sublimation.