Homoatomic polynitrogen anions are well established to be contenders for novel top-performance green high energy density materials. However, their performance is invariably hindered by the stabilizing cation, often limiting the amount of gas released and reducing the nitrogen weight fraction. Looking through the periodic table, it appears clear that hydrogen—the lightest element and readily producing a gaseous decomposition product with nitrogen (i.e. NH3)—is the ideal counterion. In this proposal, we aim to expand the chemical exploration of the N-H binary system and synthesize novel hydronitrogen compounds between pressures of 60 to 180 GPa. The laser-heated samples will be characterized by single-crystal X-ray diffraction, and the stability field of the produced solids assessed during the samples’ decompression. Preliminary Raman spectroscopy investigations suggest the formation of compounds featuring the pentazolate anion.