ZnSe2O5 crystallizes in the orthorhombic Pbcn space group. Zn(1) is bonded to two equivalent O(2) and four equivalent O(3) atoms to form edge-sharing ZnO6 octahedra. Se(1) is bonded in a distorted trigonal non-coplanar geometry to one O(1), one O(2), and one O(3) atom. There are three inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to two equivalent Se(1) atoms. In the second O site, O(2) is bonded in a distorted bent 120 degrees geometry to one Zn(1) and one Se(1) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to two equivalent Zn(1) and one Se(1) atom.
ZnSe2O5 crystallizes in the orthorhombic Pbcn space group. Zn(1) is bonded to two equivalent O(2) and four equivalent O(3) atoms to form edge-sharing ZnO6 octahedra. Both Zn(1)-O(2) bond lengths are 2.13 Å. There are two shorter (2.09 Å) and two longer (2.10 Å) Zn(1)-O(3) bond lengths. Se(1) is bonded in a distorted trigonal non-coplanar geometry to one O(1), one O(2), and one O(3) atom. The Se(1)-O(1) bond length is 1.84 Å. The Se(1)-O(2) bond length is 1.68 Å. The Se(1)-O(3) bond length is 1.70 Å. There are three inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to two equivalent Se(1) atoms. In the second O site, O(2) is bonded in a distorted bent 120 degrees geometry to one Zn(1) and one Se(1) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to two equivalent Zn(1) and one Se(1) atom.