KNi2Se2 crystallizes in the tetragonal I4/mmm space group. K(1) is bonded in a body-centered cubic geometry to eight equivalent Se(1) atoms. Ni(1) is bonded to four equivalent Se(1) atoms to form a mixture of corner and edge-sharing NiSe4 tetrahedra. Se(1) is bonded in a 8-coordinate geometry to four equivalent K(1) and four equivalent Ni(1) atoms.
KNi2Se2 crystallizes in the tetragonal I4/mmm space group. K(1) is bonded in a body-centered cubic geometry to eight equivalent Se(1) atoms. All K(1)-Se(1) bond lengths are 3.40 Å. Ni(1) is bonded to four equivalent Se(1) atoms to form a mixture of corner and edge-sharing NiSe4 tetrahedra. All Ni(1)-Se(1) bond lengths are 2.39 Å. Se(1) is bonded in a 8-coordinate geometry to four equivalent K(1) and four equivalent Ni(1) atoms.