LuSeO3F crystallizes in the monoclinic P2_1/m space group. Lu(1) is bonded to one O(1), four equivalent O(2), and two equivalent F(1) atoms to form a mixture of corner and edge-sharing LuO5F2 pentagonal bipyramids. Se(1) is bonded in a trigonal non-coplanar geometry to one O(1) and two equivalent O(2) atoms. There are two inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one Lu(1) and one Se(1) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to two equivalent Lu(1) and one Se(1) atom. F(1) is bonded in a linear geometry to two equivalent Lu(1) atoms.
LuSeO3F crystallizes in the monoclinic P2_1/m space group. Lu(1) is bonded to one O(1), four equivalent O(2), and two equivalent F(1) atoms to form a mixture of corner and edge-sharing LuO5F2 pentagonal bipyramids. The Lu(1)-O(1) bond length is 2.22 Å. There are two shorter (2.25 Å) and two longer (2.35 Å) Lu(1)-O(2) bond lengths. There is one shorter (2.15 Å) and one longer (2.16 Å) Lu(1)-F(1) bond length. Se(1) is bonded in a trigonal non-coplanar geometry to one O(1) and two equivalent O(2) atoms. The Se(1)-O(1) bond length is 1.69 Å. Both Se(1)-O(2) bond lengths are 1.75 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one Lu(1) and one Se(1) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to two equivalent Lu(1) and one Se(1) atom. F(1) is bonded in a linear geometry to two equivalent Lu(1) atoms.