Materials Data on K2Zn(CN)4 by Materials Project
K2Zn(CN)4 crystallizes in the trigonal R-3c space group. The structure is three-dimensional and consists of one K(CN)2 framework and twelve zinc molecules. In the K(CN)2 framework, there are two inequivalent K1+ sites. In the first K1+ site, K1+ is bonded to six N3- atoms to form distorted edge-sharing KN6 pentagonal pyramids. There are a spread of K–N bond distances ranging from 2.87–3.02 Å. In the second K1+ site, K1+ is bonded to six equivalent N3- atoms to form edge-sharing KN6 octahedra. All K–N bond lengths are 2.86 Å. There are two inequivalent C2+ sites. In the first C2+ site, C2+ is bonded in a single-bond geometry to one N3- atom. The C–N bond length is 1.17 Å. In the second C2+ site, C2+ is bonded in a single-bond geometry to one N3- atom. The C–N bond length is 1.17 Å. There are two inequivalent N3- sites. In the first N3- site, N3- is bonded in a 1-coordinate geometry to three K1+ and one C2+ atom. In the second N3- site, N3- is bonded to three equivalent K1+ and one C2+ atom to form distorted corner-sharing NK3C tetrahedra.