CdCu(SeO3)2 crystallizes in the monoclinic P2_1/c space group. Cu(1) is bonded to one O(1), one O(3), one O(5), and two equivalent O(4) atoms to form distorted edge-sharing CuO5 trigonal bipyramids. Cd(1) is bonded in a 7-coordinate geometry to one O(1), one O(3), one O(5), two equivalent O(2), and two equivalent O(6) 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(3) atom. In the second Se site, Se(2) is bonded in a distorted trigonal non-coplanar geometry to one O(4), one O(5), and one O(6) atom. There are six inequivalent O sites. In the first O site, O(5) is bonded in a distorted bent 120 degrees geometry to one Cu(1), one Cd(1), and one Se(2) atom. In the second O site, O(6) is bonded in a trigonal non-coplanar geometry to two equivalent Cd(1) and one Se(2) atom. In the third O site, O(1) is bonded in a distorted trigonal non-coplanar geometry to one Cu(1), one Cd(1), and one Se(1) atom. In the fourth O site, O(2) is bonded in a water-like geometry to two equivalent Cd(1) and one Se(1) atom. In the fifth O site, O(3) is bonded in a trigonal planar geometry to one Cu(1), one Cd(1), and one Se(1) atom. In the sixth O site, O(4) is bonded in a distorted trigonal planar geometry to two equivalent Cu(1) and one Se(2) atom.
CdCu(SeO3)2 crystallizes in the monoclinic P2_1/c space group. Cu(1) is bonded to one O(1), one O(3), one O(5), and two equivalent O(4) atoms to form distorted edge-sharing CuO5 trigonal bipyramids. The Cu(1)-O(1) bond length is 1.97 Å. The Cu(1)-O(3) bond length is 1.99 Å. The Cu(1)-O(5) bond length is 2.00 Å. There is one shorter (1.95 Å) and one longer (2.40 Å) Cu(1)-O(4) bond length. Cd(1) is bonded in a 7-coordinate geometry to one O(1), one O(3), one O(5), two equivalent O(2), and two equivalent O(6) atoms. The Cd(1)-O(1) bond length is 2.49 Å. The Cd(1)-O(3) bond length is 2.31 Å. The Cd(1)-O(5) bond length is 2.74 Å. There is one shorter (2.30 Å) and one longer (2.85 Å) Cd(1)-O(2) bond length. There is one shorter (2.31 Å) and one longer (2.32 Å) Cd(1)-O(6) 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(3) atom. The Se(1)-O(1) bond length is 1.76 Å. The Se(1)-O(2) bond length is 1.71 Å. The Se(1)-O(3) bond length is 1.76 Å. In the second Se site, Se(2) is bonded in a distorted trigonal non-coplanar geometry to one O(4), one O(5), and one O(6) atom. The Se(2)-O(4) bond length is 1.74 Å. The Se(2)-O(5) bond length is 1.74 Å. The Se(2)-O(6) bond length is 1.74 Å. There are six inequivalent O sites. In the first O site, O(5) is bonded in a distorted bent 120 degrees geometry to one Cu(1), one Cd(1), and one Se(2) atom. In the second O site, O(6) is bonded in a trigonal non-coplanar geometry to two equivalent Cd(1) and one Se(2) atom. In the third O site, O(1) is bonded in a distorted trigonal non-coplanar geometry to one Cu(1), one Cd(1), and one Se(1) atom. In the fourth O site, O(2) is bonded in a water-like geometry to two equivalent Cd(1) and one Se(1) atom. In the fifth O site, O(3) is bonded in a trigonal planar geometry to one Cu(1), one Cd(1), and one Se(1) atom. In the sixth O site, O(4) is bonded in a distorted trigonal planar geometry to two equivalent Cu(1) and one Se(2) atom.