Sr2Mg(H4O3)2 crystallizes in the triclinic P1 space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 7-coordinate geometry to one O(1), two equivalent O(3), two equivalent O(5), and two equivalent O(6) atoms. In the second Sr site, Sr(2) is bonded in a 5-coordinate geometry to one O(1), two equivalent O(4), and two equivalent O(6) atoms. Mg(1) is bonded in an L-shaped geometry to one O(2) and one O(5) atom. There are eight inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(1) atom. In the second H site, H(2) is bonded in a linear geometry to one O(1) and one O(3) atom. In the third H site, H(3) is bonded in a distorted linear geometry to one O(2) and one O(4) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one O(2) atom. In the fifth H site, H(5) is bonded in a single-bond geometry to one O(3) atom. In the sixth H site, H(6) is bonded in a single-bond geometry to one O(4) atom. In the seventh H site, H(7) is bonded in a single-bond geometry to one O(5) atom. In the eighth H site, H(8) is bonded in a single-bond geometry to one O(6) atom. There are six inequivalent O sites. In the first O site, O(1) is bonded in a distorted water-like geometry to one Sr(1), one Sr(2), one H(1), and one H(2) atom. In the second O site, O(2) is bonded in a distorted water-like geometry to one Mg(1), one H(3), and one H(4) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to two equivalent Sr(1), one H(2), and one H(5) atom. In the fourth O site, O(4) is bonded in a 1-coordinate geometry to two equivalent Sr(2), one H(3), and one H(6) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to two equivalent Sr(1), one Mg(1), and one H(7) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to two equivalent Sr(1), two equivalent Sr(2), and one H(8) atom.
Sr2Mg(H4O3)2 crystallizes in the triclinic P1 space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 7-coordinate geometry to one O(1), two equivalent O(3), two equivalent O(5), and two equivalent O(6) atoms. The Sr(1)-O(1) bond length is 2.99 Å. There is one shorter (2.58 Å) and one longer (2.75 Å) Sr(1)-O(3) bond length. There is one shorter (2.54 Å) and one longer (2.57 Å) Sr(1)-O(5) bond length. There is one shorter (2.59 Å) and one longer (2.74 Å) Sr(1)-O(6) bond length. In the second Sr site, Sr(2) is bonded in a 5-coordinate geometry to one O(1), two equivalent O(4), and two equivalent O(6) atoms. The Sr(2)-O(1) bond length is 2.58 Å. There is one shorter (2.51 Å) and one longer (2.59 Å) Sr(2)-O(4) bond length. There is one shorter (2.57 Å) and one longer (2.67 Å) Sr(2)-O(6) bond length. Mg(1) is bonded in an L-shaped geometry to one O(2) and one O(5) atom. The Mg(1)-O(2) bond length is 2.18 Å. The Mg(1)-O(5) bond length is 2.01 Å. There are eight inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(1) atom. The H(1)-O(1) bond length is 1.01 Å. In the second H site, H(2) is bonded in a linear geometry to one O(1) and one O(3) atom. The H(2)-O(1) bond length is 1.03 Å. The H(2)-O(3) bond length is 1.58 Å. In the third H site, H(3) is bonded in a distorted linear geometry to one O(2) and one O(4) atom. The H(3)-O(2) bond length is 1.04 Å. The H(3)-O(4) bond length is 1.56 Å. In the fourth H site, H(4) is bonded in a single-bond geometry to one O(2) atom. The H(4)-O(2) bond length is 1.00 Å. In the fifth H site, H(5) is bonded in a single-bond geometry to one O(3) atom. The H(5)-O(3) bond length is 0.98 Å. In the sixth H site, H(6) is bonded in a single-bond geometry to one O(4) atom. The H(6)-O(4) bond length is 0.99 Å. In the seventh H site, H(7) is bonded in a single-bond geometry to one O(5) atom. The H(7)-O(5) bond length is 0.98 Å. In the eighth H site, H(8) is bonded in a single-bond geometry to one O(6) atom. The H(8)-O(6) bond length is 0.99 Å. There are six inequivalent O sites. In the first O site, O(1) is bonded in a distorted water-like geometry to one Sr(1), one Sr(2), one H(1), and one H(2) atom. In the second O site, O(2) is bonded in a distorted water-like geometry to one Mg(1), one H(3), and one H(4) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to two equivalent Sr(1), one H(2), and one H(5) atom. In the fourth O site, O(4) is bonded in a 1-coordinate geometry to two equivalent Sr(2), one H(3), and one H(6) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to two equivalent Sr(1), one Mg(1), and one H(7) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to two equivalent Sr(1), two equivalent Sr(2), and one H(8) atom.