Sr2YSn2O7 crystallizes in the orthorhombic Ima2 space group. Sr(1) is bonded in a 5-coordinate geometry to two equivalent O(1) and three equivalent O(4) atoms. Y(1) is bonded in a body-centered cubic geometry to four equivalent O(2) and four equivalent O(3) atoms. Sn(1) is bonded in a 5-coordinate geometry to one O(4), two equivalent O(2), and two equivalent O(3) atoms. There are four inequivalent O sites. In the first O site, O(1) is bonded in a rectangular see-saw-like geometry to four equivalent Sr(1) atoms. In the second O site, O(2) is bonded to two equivalent Y(1) and two equivalent Sn(1) atoms to form a mixture of corner and edge-sharing OY2Sn2 tetrahedra. In the third O site, O(3) is bonded to two equivalent Y(1) and two equivalent Sn(1) atoms to form a mixture of corner and edge-sharing OY2Sn2 tetrahedra. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to three equivalent Sr(1) and one Sn(1) atom.
Sr2YSn2O7 crystallizes in the orthorhombic Ima2 space group. Sr(1) is bonded in a 5-coordinate geometry to two equivalent O(1) and three equivalent O(4) atoms. There is one shorter (2.37 Å) and one longer (2.38 Å) Sr(1)-O(1) bond length. There are a spread of Sr(1)-O(4) bond distances ranging from 2.47-3.18 Å. Y(1) is bonded in a body-centered cubic geometry to four equivalent O(2) and four equivalent O(3) atoms. There are two shorter (2.41 Å) and two longer (2.42 Å) Y(1)-O(2) bond lengths. There are two shorter (2.43 Å) and two longer (2.44 Å) Y(1)-O(3) bond lengths. Sn(1) is bonded in a 5-coordinate geometry to one O(4), two equivalent O(2), and two equivalent O(3) atoms. The Sn(1)-O(4) bond length is 1.97 Å. Both Sn(1)-O(2) bond lengths are 2.14 Å. Both Sn(1)-O(3) bond lengths are 2.14 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded in a rectangular see-saw-like geometry to four equivalent Sr(1) atoms. In the second O site, O(2) is bonded to two equivalent Y(1) and two equivalent Sn(1) atoms to form a mixture of corner and edge-sharing OY2Sn2 tetrahedra. In the third O site, O(3) is bonded to two equivalent Y(1) and two equivalent Sn(1) atoms to form a mixture of corner and edge-sharing OY2Sn2 tetrahedra. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to three equivalent Sr(1) and one Sn(1) atom.