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(K)3Zn crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional and consists of one K framework and two zinc dust molecules. In the K framework, there are two inequivalent K sites. In the first K site, K is bonded in a 8-coordinate geometry to four equivalent K atoms. All K–K bond lengths are 4.19 Å. In the second K site, K is bonded in a 8-coordinate geometry to eight equivalent K atoms.
(K)3Zn is Uranium Silicide structured and crystallizes in the cubic Pm-3m space group. The structure is zero-dimensional and consists of three potassium molecules and one zinc molecule.
(K)3Zn is alpha bismuth trifluoride structured and crystallizes in the cubic Fm-3m space group. The structure is three-dimensional and consists of one K framework and four zinc molecules. In the K framework, there are two inequivalent K sites. In the first K site, K is bonded in a 8-coordinate geometry to four equivalent K atoms. All K–K bond lengths are 4.06 Å. In the second K site, K is bonded in a body-centered cubic geometry to eight equivalent K atoms.