Materials Data on K2Ba(NO2)4 by Materials Project
K2Ba(NO2)4 crystallizes in the monoclinic C2/m space group. The structure is three-dimensional. there are two inequivalent K1+ sites. In the first K1+ site, K1+ is bonded in a 7-coordinate geometry to seven O2- atoms. There are a spread of K–O bond distances ranging from 2.84–2.90 Å. In the second K1+ site, K1+ is bonded in a 7-coordinate geometry to seven O2- atoms. There are a spread of K–O bond distances ranging from 2.83–2.90 Å. There are four inequivalent Ba2+ sites. In the first Ba2+ site, Ba2+ is bonded in a hexagonal bipyramidal geometry to eight O2- atoms. There are four shorter (3.03 Å) and four longer (3.08 Å) Ba–O bond lengths. In the second Ba2+ site, Ba2+ is bonded in a hexagonal bipyramidal geometry to eight O2- atoms. There are four shorter (3.03 Å) and four longer (3.09 Å) Ba–O bond lengths. In the third Ba2+ site, Ba2+ is bonded in a hexagonal bipyramidal geometry to eight O2- atoms. There are four shorter (2.89 Å) and four longer (3.02 Å) Ba–O bond lengths. In the fourth Ba2+ site, Ba2+ is bonded in a hexagonal bipyramidal geometry to eight O2- atoms. There are four shorter (2.89 Å) and four longer (3.02 Å) Ba–O bond lengths. There are eight inequivalent N3+ sites. In the first N3+ site, N3+ is bonded in a bent 120 degrees geometry to two equivalent O2- atoms. Both N–O bond lengths are 1.27 Å. In the second N3+ site, N3+ is bonded in a bent 120 degrees geometry to two equivalent O2- atoms. Both N–O bond lengths are 1.27 Å. In the third N3+ site, N3+ is bonded in a bent 120 degrees geometry to two equivalent O2- atoms. Both N–O bond lengths are 1.27 Å. In the fourth N3+ site, N3+ is bonded in a bent 120 degrees geometry to two equivalent O2- atoms. Both N–O bond lengths are 1.27 Å. In the fifth N3+ site, N3+ is bonded in a bent 120 degrees geometry to two equivalent O2- atoms. Both N–O bond lengths are 1.27 Å. In the sixth N3+ site, N3+ is bonded in a bent 120 degrees geometry to two equivalent O2- atoms. Both N–O bond lengths are 1.27 Å. In the seventh N3+ site, N3+ is bonded in a bent 120 degrees geometry to two equivalent O2- atoms. Both N–O bond lengths are 1.27 Å. In the eighth N3+ site, N3+ is bonded in a bent 120 degrees geometry to two equivalent O2- atoms. Both N–O bond lengths are 1.27 Å. There are eight inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted single-bond geometry to two K1+, one Ba2+, and one N3+ atom. In the second O2- site, O2- is bonded in a distorted single-bond geometry to one K1+, one Ba2+, and one N3+ atom. In the third O2- site, O2- is bonded in a distorted single-bond geometry to two equivalent K1+, one Ba2+, and one N3+ atom. In the fourth O2- site, O2- is bonded in a distorted single-bond geometry to two equivalent K1+, one Ba2+, and one N3+ atom. In the fifth O2- site, O2- is bonded in a distorted single-bond geometry to two K1+, one Ba2+, and one N3+ atom. In the sixth O2- site, O2- is bonded in a distorted single-bond geometry to two K1+, one Ba2+, and one N3+ atom. In the seventh O2- site, O2- is bonded in a distorted single-bond geometry to one K1+, one Ba2+, and one N3+ atom. In the eighth O2- site, O2- is bonded in a distorted single-bond geometry to two K1+, one Ba2+, and one N3+ atom.