SrH2O7Br2 crystallizes in the monoclinic C2/c space group. Sr(1) is bonded in a 11-coordinate geometry to one O(1), two equivalent O(3), four equivalent O(2), and four equivalent O(4) atoms. H(1) is bonded in a single-bond geometry to one O(1) atom. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted water-like geometry to one Sr(1) and two equivalent H(1) atoms. In the second O site, O(2) is bonded in a 3-coordinate geometry to two equivalent Sr(1) and one Br(1) atom. In the third O site, O(3) is bonded in a 1-coordinate geometry to one Sr(1) and one Br(1) atom. In the fourth O site, O(4) is bonded in a 2-coordinate geometry to two equivalent Sr(1) and one Br(1) atom. Br(1) is bonded in a trigonal non-coplanar geometry to one O(2), one O(3), and one O(4) atom.
SrH2O7Br2 crystallizes in the monoclinic C2/c space group. Sr(1) is bonded in a 11-coordinate geometry to one O(1), two equivalent O(3), four equivalent O(2), and four equivalent O(4) atoms. The Sr(1)-O(1) bond length is 2.53 Å. Both Sr(1)-O(3) bond lengths are 2.79 Å. There are two shorter (2.81 Å) and two longer (3.09 Å) Sr(1)-O(2) bond lengths. There are two shorter (2.61 Å) and two longer (3.17 Å) Sr(1)-O(4) bond lengths. H(1) is bonded in a single-bond geometry to one O(1) atom. The H(1)-O(1) bond length is 0.98 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted water-like geometry to one Sr(1) and two equivalent H(1) atoms. In the second O site, O(2) is bonded in a 3-coordinate geometry to two equivalent Sr(1) and one Br(1) atom. The O(2)-Br(1) bond length is 1.69 Å. In the third O site, O(3) is bonded in a 1-coordinate geometry to one Sr(1) and one Br(1) atom. The O(3)-Br(1) bond length is 1.70 Å. In the fourth O site, O(4) is bonded in a 2-coordinate geometry to two equivalent Sr(1) and one Br(1) atom. The O(4)-Br(1) bond length is 1.68 Å. Br(1) is bonded in a trigonal non-coplanar geometry to one O(2), one O(3), and one O(4) atom.