KSe3 crystallizes in the monoclinic C2 space group. K(1) is bonded in a 5-coordinate geometry to two equivalent Se(1), three equivalent Se(2), and three equivalent Se(3) atoms. There are three inequivalent Se sites. In the first Se site, Se(3) is bonded in a 5-coordinate geometry to three equivalent K(1), one Se(1), and one Se(2) atom. In the second Se site, Se(1) is bonded in a 4-coordinate geometry to two equivalent K(1), one Se(2), and one Se(3) atom. In the third Se site, Se(2) is bonded in a 5-coordinate geometry to three equivalent K(1), one Se(1), and one Se(3) atom.
KSe3 crystallizes in the monoclinic C2 space group. K(1) is bonded in a 5-coordinate geometry to two equivalent Se(1), three equivalent Se(2), and three equivalent Se(3) atoms. There is one shorter (3.43 Å) and one longer (3.47 Å) K(1)-Se(1) bond length. There are a spread of K(1)-Se(2) bond distances ranging from 3.31-3.62 Å. There are a spread of K(1)-Se(3) bond distances ranging from 3.38-3.89 Å. There are three inequivalent Se sites. In the first Se site, Se(3) is bonded in a 5-coordinate geometry to three equivalent K(1), one Se(1), and one Se(2) atom. The Se(3)-Se(1) bond length is 2.54 Å. The Se(3)-Se(2) bond length is 2.40 Å. In the second Se site, Se(1) is bonded in a 4-coordinate geometry to two equivalent K(1), one Se(2), and one Se(3) atom. The Se(1)-Se(2) bond length is 2.69 Å. In the third Se site, Se(2) is bonded in a 5-coordinate geometry to three equivalent K(1), one Se(1), and one Se(3) atom.