Cd2Se3O13(NO)2 crystallizes in the monoclinic P2_1/m space group. The structure consists of two 1,3,2,4-dioxadiazetidine molecules inside a Cd2Se3O13 framework. In the Cd2Se3O13 framework, Cd(1) is bonded to one O(3), one O(4), one O(5), one O(6), one O(7), and one O(8) atom to form distorted CdO6 octahedra that share corners with four equivalent Se(2)O4 tetrahedra. There are two inequivalent Se sites. In the first Se site, Se(1) is bonded in a trigonal non-coplanar geometry to one O(1) and two equivalent O(3) atoms. In the second Se site, Se(2) is bonded to one O(4), one O(5), one O(6), and one O(7) atom to form SeO4 tetrahedra that share corners with four equivalent Cd(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 43-59°. There are seven inequivalent O sites. In the first O site, O(7) is bonded in a bent 120 degrees geometry to one Cd(1) and one Se(2) atom. In the second O site, O(8) is bonded in a single-bond geometry to one Cd(1) atom. In the third O site, O(1) is bonded in a single-bond geometry to one Se(1) atom. In the fourth O site, O(3) is bonded in a bent 120 degrees geometry to one Cd(1) and one Se(1) atom. In the fifth O site, O(4) is bonded in a distorted bent 150 degrees geometry to one Cd(1) and one Se(2) atom. In the sixth O site, O(5) is bonded in a bent 120 degrees geometry to one Cd(1) and one Se(2) atom. In the seventh O site, O(6) is bonded in a distorted bent 120 degrees geometry to one Cd(1) and one Se(2) atom.
Cd2Se3O13(NO)2 crystallizes in the monoclinic P2_1/m space group. The structure consists of two 1,3,2,4-dioxadiazetidine molecules inside a Cd2Se3O13 framework. In the Cd2Se3O13 framework, Cd(1) is bonded to one O(3), one O(4), one O(5), one O(6), one O(7), and one O(8) atom to form distorted CdO6 octahedra that share corners with four equivalent Se(2)O4 tetrahedra. The Cd(1)-O(3) bond length is 2.38 Å. The Cd(1)-O(4) bond length is 2.26 Å. The Cd(1)-O(5) bond length is 2.29 Å. The Cd(1)-O(6) bond length is 2.41 Å. The Cd(1)-O(7) bond length is 2.28 Å. The Cd(1)-O(8) bond length is 2.35 Å. There are two inequivalent Se sites. In the first Se site, Se(1) is bonded in a trigonal non-coplanar geometry to one O(1) and two equivalent O(3) atoms. The Se(1)-O(1) bond length is 1.71 Å. Both Se(1)-O(3) bond lengths are 1.69 Å. In the second Se site, Se(2) is bonded to one O(4), one O(5), one O(6), and one O(7) atom to form SeO4 tetrahedra that share corners with four equivalent Cd(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 43-59°. The Se(2)-O(4) bond length is 1.67 Å. The Se(2)-O(5) bond length is 1.68 Å. The Se(2)-O(6) bond length is 1.70 Å. The Se(2)-O(7) bond length is 1.67 Å. There are seven inequivalent O sites. In the first O site, O(7) is bonded in a bent 120 degrees geometry to one Cd(1) and one Se(2) atom. In the second O site, O(8) is bonded in a single-bond geometry to one Cd(1) atom. In the third O site, O(1) is bonded in a single-bond geometry to one Se(1) atom. In the fourth O site, O(3) is bonded in a bent 120 degrees geometry to one Cd(1) and one Se(1) atom. In the fifth O site, O(4) is bonded in a distorted bent 150 degrees geometry to one Cd(1) and one Se(2) atom. In the sixth O site, O(5) is bonded in a bent 120 degrees geometry to one Cd(1) and one Se(2) atom. In the seventh O site, O(6) is bonded in a distorted bent 120 degrees geometry to one Cd(1) and one Se(2) atom.