Sr3TaHO6 crystallizes in the monoclinic Cm space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 6-coordinate geometry to one O(1), one O(2), one O(3), one O(4), and two equivalent O(5) atoms. In the second Sr site, Sr(2) is bonded in a 6-coordinate geometry to one O(1), one O(2), one O(3), one O(4), and two equivalent O(5) atoms. Ta(1) is bonded in a 5-coordinate geometry to one O(1), one O(2), one O(3), and two equivalent O(5) atoms. H(1) is bonded in a single-bond geometry to one O(4) atom. There are five inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Sr(2), two equivalent Sr(1), and one Ta(1) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Sr(2), two equivalent Sr(1), and one Ta(1) atom. In the third O site, O(3) is bonded in a distorted rectangular see-saw-like geometry to one Sr(2), two equivalent Sr(1), and one Ta(1) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one Sr(2), two equivalent Sr(1), and one H(1) atom. In the fifth O site, O(5) is bonded in a distorted see-saw-like geometry to one Sr(2), two equivalent Sr(1), and one Ta(1) atom.
Sr3TaHO6 crystallizes in the monoclinic Cm space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 6-coordinate geometry to one O(1), one O(2), one O(3), one O(4), and two equivalent O(5) atoms. The Sr(1)-O(1) bond length is 2.57 Å. The Sr(1)-O(2) bond length is 2.63 Å. The Sr(1)-O(3) bond length is 2.61 Å. The Sr(1)-O(4) bond length is 2.61 Å. There is one shorter (2.52 Å) and one longer (2.59 Å) Sr(1)-O(5) bond length. In the second Sr site, Sr(2) is bonded in a 6-coordinate geometry to one O(1), one O(2), one O(3), one O(4), and two equivalent O(5) atoms. The Sr(2)-O(1) bond length is 2.45 Å. The Sr(2)-O(2) bond length is 2.88 Å. The Sr(2)-O(3) bond length is 2.48 Å. The Sr(2)-O(4) bond length is 2.38 Å. Both Sr(2)-O(5) bond lengths are 2.42 Å. Ta(1) is bonded in a 5-coordinate geometry to one O(1), one O(2), one O(3), and two equivalent O(5) atoms. The Ta(1)-O(1) bond length is 2.04 Å. The Ta(1)-O(2) bond length is 1.90 Å. The Ta(1)-O(3) bond length is 1.96 Å. Both Ta(1)-O(5) bond lengths are 1.99 Å. H(1) is bonded in a single-bond geometry to one O(4) atom. The H(1)-O(4) bond length is 0.99 Å. There are five inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Sr(2), two equivalent Sr(1), and one Ta(1) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Sr(2), two equivalent Sr(1), and one Ta(1) atom. In the third O site, O(3) is bonded in a distorted rectangular see-saw-like geometry to one Sr(2), two equivalent Sr(1), and one Ta(1) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one Sr(2), two equivalent Sr(1), and one H(1) atom. In the fifth O site, O(5) is bonded in a distorted see-saw-like geometry to one Sr(2), two equivalent Sr(1), and one Ta(1) atom.