Materials Data on KN2 by Materials Project
KN2 crystallizes in the orthorhombic Cmc2_1 space group. The structure is three-dimensional. K1+ is bonded in a 10-coordinate geometry to ten N+0.50- atoms. There are a spread of K–N bond distances ranging from 2.80–3.03 Å. There are two inequivalent N+0.50- sites. In the first N+0.50- site, N+0.50- is bonded to five equivalent K1+ and two equivalent N+0.50- atoms to form a mixture of corner and edge-sharing NK5N2 pentagonal bipyramids. Both N–N bond lengths are 1.52 Å. In the second N+0.50- site, N+0.50- is bonded in a 2-coordinate geometry to five equivalent K1+ and two equivalent N+0.50- atoms.
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