MgH2(SeO3)2 crystallizes in the monoclinic P2_1/c space group. Mg(1) is bonded in an octahedral geometry to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms. H(1) is bonded in a distorted linear geometry to one O(2) and one O(3) atom. 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 one Mg(1) and one Se(1) atom. In the second O site, O(2) is bonded in a trigonal planar geometry to one Mg(1), one H(1), and one Se(1) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Mg(1), one H(1), and one Se(1) atom.
MgH2(SeO3)2 crystallizes in the monoclinic P2_1/c space group. Mg(1) is bonded in an octahedral geometry to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms. Both Mg(1)-O(1) bond lengths are 2.07 Å. Both Mg(1)-O(2) bond lengths are 2.11 Å. Both Mg(1)-O(3) bond lengths are 2.16 Å. H(1) is bonded in a distorted linear geometry to one O(2) and one O(3) atom. The H(1)-O(2) bond length is 1.65 Å. The H(1)-O(3) bond length is 1.02 Å. 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 1.68 Å. The Se(1)-O(2) bond length is 1.72 Å. The Se(1)-O(3) bond length is 1.85 Å. There are three inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one Mg(1) and one Se(1) atom. In the second O site, O(2) is bonded in a trigonal planar geometry to one Mg(1), one H(1), and one Se(1) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Mg(1), one H(1), and one Se(1) atom.