Materials Data on Pr2(N4O9)3 by Materials Project
(Pr2(NO3)9)2(N2)3 crystallizes in the cubic P4_332 space group. The structure is three-dimensional and consists of twelve ammonia molecules and one Pr2(NO3)9 framework. In the Pr2(NO3)9 framework, Pr3+ is bonded to twelve O2- atoms to form corner-sharing PrO12 cuboctahedra. There are a spread of Pr–O bond distances ranging from 2.61–2.69 Å. There are two inequivalent N4+ sites. In the first N4+ site, N4+ is bonded in a trigonal planar geometry to three O2- atoms. There is one shorter (1.24 Å) and two longer (1.27 Å) N–O bond length. In the second N4+ site, N4+ is bonded in a trigonal planar geometry to three O2- atoms. There is two shorter (1.25 Å) and one longer (1.31 Å) N–O bond length. There are five inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted single-bond geometry to one Pr3+ and one N4+ atom. In the second O2- site, O2- is bonded in a single-bond geometry to one N4+ atom. In the third O2- site, O2- is bonded in a distorted single-bond geometry to one Pr3+ and one N4+ atom. In the fourth O2- site, O2- is bonded in a distorted single-bond geometry to two equivalent Pr3+ and one N4+ atom. In the fifth O2- site, O2- is bonded in a distorted single-bond geometry to one Pr3+ and one N4+ atom.