Hg2Cd2H(SeO5)2 crystallizes in the monoclinic P2/c space group. There are two inequivalent Hg sites. In the first Hg site, Hg(1) is bonded in a distorted linear geometry to two equivalent O(5) atoms. In the second Hg site, Hg(2) is bonded in a linear geometry to two equivalent O(5) atoms. Cd(1) is bonded in a 5-coordinate geometry to one H(1), one O(1), one O(2), one O(3), and two equivalent O(5) atoms. H(1) is bonded in a distorted bent 120 degrees geometry to two equivalent Cd(1) atoms. Se(1) is bonded in a tetrahedral geometry to one O(1), one O(2), 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 distorted bent 150 degrees geometry to one Cd(1) and one Se(1) atom. In the second O site, O(2) is bonded in a distorted bent 120 degrees geometry to one Cd(1) and one Se(1) atom. In the third O site, O(3) is bonded in a distorted bent 120 degrees geometry to one Cd(1) and one Se(1) atom. In the fourth O site, O(4) is bonded in a single-bond geometry to one Se(1) atom. In the fifth O site, O(5) is bonded to one Hg(1), one Hg(2), and two equivalent Cd(1) atoms to form a mixture of corner and edge-sharing OCd2Hg2 tetrahedra.
Hg2Cd2H(SeO5)2 crystallizes in the monoclinic P2/c space group. There are two inequivalent Hg sites. In the first Hg site, Hg(1) is bonded in a distorted linear geometry to two equivalent O(5) atoms. Both Hg(1)-O(5) bond lengths are 2.13 Å. In the second Hg site, Hg(2) is bonded in a linear geometry to two equivalent O(5) atoms. Both Hg(2)-O(5) bond lengths are 2.08 Å. Cd(1) is bonded in a 5-coordinate geometry to one H(1), one O(1), one O(2), one O(3), and two equivalent O(5) atoms. The Cd(1)-H(1) bond length is 2.49 Å. The Cd(1)-O(1) bond length is 2.26 Å. The Cd(1)-O(2) bond length is 2.25 Å. The Cd(1)-O(3) bond length is 2.23 Å. There is one shorter (2.33 Å) and one longer (2.38 Å) Cd(1)-O(5) bond length. H(1) is bonded in a distorted bent 120 degrees geometry to two equivalent Cd(1) atoms. Se(1) is bonded in a tetrahedral geometry to one O(1), one O(2), one O(3), and one O(4) atom. The Se(1)-O(1) bond length is 1.67 Å. The Se(1)-O(2) bond length is 1.70 Å. The Se(1)-O(3) bond length is 1.69 Å. The Se(1)-O(4) bond length is 1.66 Å. There are five inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 150 degrees geometry to one Cd(1) and one Se(1) atom. In the second O site, O(2) is bonded in a distorted bent 120 degrees geometry to one Cd(1) and one Se(1) atom. In the third O site, O(3) is bonded in a distorted bent 120 degrees geometry to one Cd(1) and one Se(1) atom. In the fourth O site, O(4) is bonded in a single-bond geometry to one Se(1) atom. In the fifth O site, O(5) is bonded to one Hg(1), one Hg(2), and two equivalent Cd(1) atoms to form a mixture of corner and edge-sharing OCd2Hg2 tetrahedra.