Synthesis of FeN4 at 180 GPa and its crystal structure from a submicron-sized grain

Iron tetranitride, FeN₄, was synthesized from the elements in a laser-heated diamond anvil cell at 180 (5) GPa and 2700 (200) K. Its crystal structure was determined based on single-crystal X-ray diffraction data collected from a submicron-sized grain at the synchrotron beamline ID11 of ESRF. The compound crystallizes in the triclinic space groupP\overline{1}. In the asymmetric unit, the Fe atom occupies an inversion centre (Wyckoff position 1d), while two N atoms occupy general positions (2i). The structure is made up from edge-sharing [FeN₆] octahedra forming chains along [100] and being interconnected through N—N bridges. N atoms formcatena-poly[tetraz-1-ene-1,4-diyl] anions [–N=N—N—N–]_∞²⁻running along [001]. In comparison with the previously reported structure of FeN₄at 135 GPa [Bykovet al.(2018).Nat. Commun.9, 2756], the crystal structure of FeN₄at 180 GPa is similar but the structural model is significantly improved in terms of the precision of the bond lengths and angles.