Materials Data on K5CeFe2(NO2)12 by Materials Project
K5Ce(NO2)12(Fe)2 crystallizes in the cubic Pn-3 space group. The structure is three-dimensional and consists of four iron molecules and one K5Ce(NO2)12 framework. In the K5Ce(NO2)12 framework, there are two inequivalent K1+ sites. In the first K1+ site, K1+ is bonded to twelve O2- atoms to form KO12 cuboctahedra that share faces with two equivalent CeO12 cuboctahedra and faces with six equivalent KO12 cuboctahedra. There are six shorter (2.81 Å) and six longer (2.86 Å) K–O bond lengths. In the second K1+ site, K1+ is bonded to twelve O2- atoms to form KO12 cuboctahedra that share edges with two equivalent CeO12 cuboctahedra, edges with four equivalent KO12 cuboctahedra, and faces with four equivalent KO12 cuboctahedra. There are a spread of K–O bond distances ranging from 3.02–3.24 Å. Ce3+ is bonded to twelve equivalent O2- atoms to form CeO12 cuboctahedra that share edges with six equivalent KO12 cuboctahedra and faces with four equivalent KO12 cuboctahedra. All Ce–O bond lengths are 2.83 Å. N+2.83+ is bonded in a bent 120 degrees geometry to two O2- atoms. There is one shorter (1.25 Å) and one longer (1.28 Å) N–O bond length. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted single-bond geometry to three K1+ and one N+2.83+ atom. In the second O2- site, O2- is bonded in a distorted single-bond geometry to two K1+, one Ce3+, and one N+2.83+ atom.