DOE OSTI2019
Na2MnN2 crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. there are two inequivalent Na1+ sites. In the first Na1+ site, Na1+ is bonded in a distorted T-shaped geometry to three N3- atoms. There are one shorter (2.41 Å) and two longer (2.51 Å) Na–N bond lengths. In the second Na1+ site, Na1+ is bonded in a 5-coordinate geometry to five N3- atoms. There are a spread of Na–N bond distances ranging from 2.53–2.81 Å. Mn4+ is bonded in a trigonal planar geometry to three N3- atoms. There are a spread of Mn–N bond distances ranging from 1.62–1.76 Å. There are two inequivalent N3- sites. In the first N3- site, N3- is bonded in a 6-coordinate geometry to four Na1+ and two equivalent Mn4+ atoms. In the second N3- site, N3- is bonded in a 5-coordinate geometry to four Na1+ and one Mn4+ atom.