LaSe2 crystallizes in the monoclinic P2_1/c space group. La(1) is bonded in a 7-coordinate geometry to three equivalent Se(1) and four equivalent Se(2) atoms. There are two inequivalent Se sites. In the first Se site, Se(2) is bonded to four equivalent La(1) atoms to form a mixture of distorted corner and edge-sharing SeLa4 tetrahedra. In the second Se site, Se(1) is bonded in a 4-coordinate geometry to three equivalent La(1) and one Se(1) atom.
LaSe2 crystallizes in the monoclinic P2_1/c space group. La(1) is bonded in a 7-coordinate geometry to three equivalent Se(1) and four equivalent Se(2) atoms. There are a spread of La(1)-Se(1) bond distances ranging from 3.05-3.27 Å. There are a spread of La(1)-Se(2) bond distances ranging from 2.94-3.17 Å. There are two inequivalent Se sites. In the first Se site, Se(2) is bonded to four equivalent La(1) atoms to form a mixture of distorted corner and edge-sharing SeLa4 tetrahedra. In the second Se site, Se(1) is bonded in a 4-coordinate geometry to three equivalent La(1) and one Se(1) atom. The Se(1)-Se(1) bond length is 2.50 Å.