Mg3H4SeO3H2 crystallizes in the triclinic P1 space group. The structure consists of one 1333-74-0 molecule inside a Mg3H4SeO3 framework. In the Mg3H4SeO3 framework, there are three inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a distorted trigonal planar geometry to one H(5), one Se(1), and one O(3) atom. In the second Mg site, Mg(2) is bonded to one H(5), two equivalent Se(1), and one O(1) atom to form distorted corner-sharing MgHSe2O tetrahedra. In the third Mg site, Mg(3) is bonded in a 4-coordinate geometry to one Se(1), one O(1), one O(3), and two equivalent O(2) atoms. There are four inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(3) atom. In the second H site, H(3) is bonded in a single-bond geometry to one O(1) atom. In the third H site, H(4) is bonded in a single-bond geometry to one O(2) atom. In the fourth H site, H(5) is bonded in a bent 120 degrees geometry to one Mg(1) and one Mg(2) atom. Se(1) is bonded to one Mg(1), one Mg(3), and two equivalent Mg(2) atoms to form corner-sharing SeMg4 tetrahedra. There are three inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one Mg(2), one Mg(3), and one H(3) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to two equivalent Mg(3) and one H(4) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to one Mg(1), one Mg(3), and one H(1) atom.
Mg3H4SeO3H2 crystallizes in the triclinic P1 space group. The structure consists of one 1333-74-0 molecule inside a Mg3H4SeO3 framework. In the Mg3H4SeO3 framework, there are three inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a distorted trigonal planar geometry to one H(5), one Se(1), and one O(3) atom. The Mg(1)-H(5) bond length is 1.81 Å. The Mg(1)-Se(1) bond length is 2.49 Å. The Mg(1)-O(3) bond length is 1.93 Å. In the second Mg site, Mg(2) is bonded to one H(5), two equivalent Se(1), and one O(1) atom to form distorted corner-sharing MgHSe2O tetrahedra. The Mg(2)-H(5) bond length is 1.89 Å. There is one shorter (2.57 Å) and one longer (2.58 Å) Mg(2)-Se(1) bond length. The Mg(2)-O(1) bond length is 1.93 Å. In the third Mg site, Mg(3) is bonded in a 4-coordinate geometry to one Se(1), one O(1), one O(3), and two equivalent O(2) atoms. The Mg(3)-Se(1) bond length is 2.78 Å. The Mg(3)-O(1) bond length is 2.01 Å. The Mg(3)-O(3) bond length is 2.17 Å. There is one shorter (2.03 Å) and one longer (2.17 Å) Mg(3)-O(2) bond length. There are four inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(3) atom. The H(1)-O(3) bond length is 0.98 Å. In the second H site, H(3) is bonded in a single-bond geometry to one O(1) atom. The H(3)-O(1) bond length is 0.99 Å. In the third H site, H(4) is bonded in a single-bond geometry to one O(2) atom. The H(4)-O(2) bond length is 0.98 Å. In the fourth H site, H(5) is bonded in a bent 120 degrees geometry to one Mg(1) and one Mg(2) atom. Se(1) is bonded to one Mg(1), one Mg(3), and two equivalent Mg(2) atoms to form corner-sharing SeMg4 tetrahedra. There are three inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one Mg(2), one Mg(3), and one H(3) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to two equivalent Mg(3) and one H(4) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to one Mg(1), one Mg(3), and one H(1) atom.