Sr2B5H2O11 crystallizes in the monoclinic C2 space group. Sr(1) is bonded in a 9-coordinate geometry to one O(1), one O(4), one O(5), two equivalent O(2), two equivalent O(3), and two equivalent O(6) atoms. There are three inequivalent B sites. In the first B site, B(1) is bonded to one O(2), one O(3), one O(4), and one O(5) atom to form corner-sharing BO4 tetrahedra. In the second B site, B(2) is bonded to two equivalent O(1) and two equivalent O(3) atoms to form corner-sharing BO4 tetrahedra. In the third B site, B(3) is bonded in a trigonal planar geometry to one O(1), one O(2), and one O(5) atom. H(1) 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 bent 120 degrees geometry to one Sr(1), one B(2), and one B(3) atom. In the second O site, O(2) is bonded in a distorted bent 120 degrees geometry to two equivalent Sr(1), one B(1), and one B(3) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to two equivalent Sr(1), one B(1), and one B(2) atom. In the fourth O site, O(4) is bonded in a distorted bent 120 degrees geometry to two equivalent Sr(1) and two equivalent B(1) atoms. In the fifth O site, O(5) is bonded in a distorted bent 120 degrees geometry to one Sr(1), one B(1), and one B(3) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to two equivalent Sr(1) and one H(1) atom.
Sr2B5H2O11 crystallizes in the monoclinic C2 space group. Sr(1) is bonded in a 9-coordinate geometry to one O(1), one O(4), one O(5), two equivalent O(2), two equivalent O(3), and two equivalent O(6) atoms. The Sr(1)-O(1) bond length is 2.56 Å. The Sr(1)-O(4) bond length is 2.73 Å. The Sr(1)-O(5) bond length is 2.63 Å. There is one shorter (2.73 Å) and one longer (2.96 Å) Sr(1)-O(2) bond length. There is one shorter (2.67 Å) and one longer (2.72 Å) Sr(1)-O(3) bond length. Both Sr(1)-O(6) bond lengths are 2.60 Å. There are three inequivalent B sites. In the first B site, B(1) is bonded to one O(2), one O(3), one O(4), and one O(5) atom to form corner-sharing BO4 tetrahedra. The B(1)-O(2) bond length is 1.52 Å. The B(1)-O(3) bond length is 1.47 Å. The B(1)-O(4) bond length is 1.46 Å. The B(1)-O(5) bond length is 1.49 Å. In the second B site, B(2) is bonded to two equivalent O(1) and two equivalent O(3) atoms to form corner-sharing BO4 tetrahedra. Both B(2)-O(1) bond lengths are 1.51 Å. Both B(2)-O(3) bond lengths are 1.46 Å. In the third B site, B(3) is bonded in a trigonal planar geometry to one O(1), one O(2), and one O(5) atom. The B(3)-O(1) bond length is 1.37 Å. The B(3)-O(2) bond length is 1.38 Å. The B(3)-O(5) bond length is 1.39 Å. H(1) is bonded in a single-bond geometry to one O(6) atom. The H(1)-O(6) bond length is 0.98 Å. There are six inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 120 degrees geometry to one Sr(1), one B(2), and one B(3) atom. In the second O site, O(2) is bonded in a distorted bent 120 degrees geometry to two equivalent Sr(1), one B(1), and one B(3) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to two equivalent Sr(1), one B(1), and one B(2) atom. In the fourth O site, O(4) is bonded in a distorted bent 120 degrees geometry to two equivalent Sr(1) and two equivalent B(1) atoms. In the fifth O site, O(5) is bonded in a distorted bent 120 degrees geometry to one Sr(1), one B(1), and one B(3) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to two equivalent Sr(1) and one H(1) atom.