PbSe2O5 crystallizes in the monoclinic P2_1/c space group. Pb(1) is bonded in a 5-coordinate geometry to one O(3), one O(4), one O(5), and two equivalent O(2) atoms. There are two inequivalent Se sites. In the first Se site, Se(1) is bonded in a distorted trigonal non-coplanar geometry to one O(1), one O(2), and one O(5) atom. In the second Se site, Se(2) is bonded in a distorted trigonal non-coplanar geometry to one O(1), one O(3), and one O(4) atom. There are five inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one Se(1) and one Se(2) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to two equivalent Pb(1) and one Se(1) atom. In the third O site, O(3) is bonded in a distorted bent 150 degrees geometry to one Pb(1) and one Se(2) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one Pb(1) and one Se(2) atom. In the fifth O site, O(5) is bonded in a distorted single-bond geometry to one Pb(1) and one Se(1) atom.
PbSe2O5 crystallizes in the monoclinic P2_1/c space group. Pb(1) is bonded in a 5-coordinate geometry to one O(3), one O(4), one O(5), and two equivalent O(2) atoms. The Pb(1)-O(3) bond length is 2.55 Å. The Pb(1)-O(4) bond length is 2.49 Å. The Pb(1)-O(5) bond length is 2.68 Å. There is one shorter (2.49 Å) and one longer (2.50 Å) Pb(1)-O(2) bond length. There are two inequivalent Se sites. In the first Se site, Se(1) is bonded in a distorted trigonal non-coplanar geometry to one O(1), one O(2), and one O(5) atom. The Se(1)-O(1) bond length is 1.86 Å. The Se(1)-O(2) bond length is 1.71 Å. The Se(1)-O(5) bond length is 1.67 Å. In the second Se site, Se(2) is bonded in a distorted trigonal non-coplanar geometry to one O(1), one O(3), and one O(4) atom. The Se(2)-O(1) bond length is 1.85 Å. The Se(2)-O(3) bond length is 1.67 Å. The Se(2)-O(4) bond length is 1.68 Å. There are five inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one Se(1) and one Se(2) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to two equivalent Pb(1) and one Se(1) atom. In the third O site, O(3) is bonded in a distorted bent 150 degrees geometry to one Pb(1) and one Se(2) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one Pb(1) and one Se(2) atom. In the fifth O site, O(5) is bonded in a distorted single-bond geometry to one Pb(1) and one Se(1) atom.