MnSe2O5 crystallizes in the monoclinic C2/c space group. Mn(1) is bonded to two equivalent O(2) and four equivalent O(3) atoms to form edge-sharing MnO6 octahedra. Se(1) is bonded in a 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 150 degrees geometry to two equivalent Se(1) atoms. In the second O site, O(2) is bonded in a bent 120 degrees geometry to one Mn(1) and one Se(1) atom. In the third O site, O(3) is bonded in a trigonal planar geometry to two equivalent Mn(1) and one Se(1) atom.
MnSe2O5 crystallizes in the monoclinic C2/c space group. Mn(1) is bonded to two equivalent O(2) and four equivalent O(3) atoms to form edge-sharing MnO6 octahedra. Both Mn(1)-O(2) bond lengths are 2.14 Å. There are two shorter (2.16 Å) and two longer (2.20 Å) Mn(1)-O(3) bond lengths. Se(1) is bonded in a trigonal non-coplanar geometry to one O(1), one O(2), and one O(3) atom. The Se(1)-O(1) bond length is 1.83 Å. The Se(1)-O(2) bond length is 1.67 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 150 degrees geometry to two equivalent Se(1) atoms. In the second O site, O(2) is bonded in a bent 120 degrees geometry to one Mn(1) and one Se(1) atom. In the third O site, O(3) is bonded in a trigonal planar geometry to two equivalent Mn(1) and one Se(1) atom.