Sr2Y2Mn2O7 crystallizes in the orthorhombic Ima2 space group. Sr(1) is bonded in a 5-coordinate geometry to one O(1), one O(3), two equivalent O(2), and two equivalent O(4) atoms. There are two inequivalent Y sites. In the first Y site, Y(1) is bonded in a 4-coordinate geometry to two equivalent O(3) and four equivalent O(2) atoms. In the second Y site, Y(2) is bonded to two equivalent O(1) and two equivalent O(4) atoms to form YO4 tetrahedra that share corners with two equivalent Y(2)O4 tetrahedra and corners with two equivalent Mn(1)O5 trigonal bipyramids. Mn(1) is bonded to one O(4), two equivalent O(2), and two equivalent O(3) atoms to form MnO5 trigonal bipyramids that share  a cornercorner with one Y(2)O4 tetrahedra and corners with four equivalent Mn(1)O5 trigonal bipyramids. There are four inequivalent O sites. In the first O site, O(4) is bonded in a 4-coordinate geometry to two equivalent Sr(1), one Y(2), and one Mn(1) atom. In the second O site, O(1) is bonded to two equivalent Sr(1) and two equivalent Y(2) atoms to form distorted corner-sharing OSr2Y2 tetrahedra. In the third O site, O(2) is bonded in a 6-coordinate geometry to two equivalent Sr(1), two equivalent Y(1), and two equivalent Mn(1) atoms. In the fourth O site, O(3) is bonded in a 4-coordinate geometry to one Sr(1), one Y(1), and two equivalent Mn(1) atoms.
Sr2Y2Mn2O7 crystallizes in the orthorhombic Ima2 space group. Sr(1) is bonded in a 5-coordinate geometry to one O(1), one O(3), two equivalent O(2), and two equivalent O(4) atoms. The Sr(1)-O(1) bond length is 2.69 Å. The Sr(1)-O(3) bond length is 2.51 Å. There is one shorter (2.58 Å) and one longer (2.96 Å) Sr(1)-O(2) bond length. There is one shorter (2.50 Å) and one longer (2.62 Å) Sr(1)-O(4) bond length. There are two inequivalent Y sites. In the first Y site, Y(1) is bonded in a 4-coordinate geometry to two equivalent O(3) and four equivalent O(2) atoms. Both Y(1)-O(3) bond lengths are 2.24 Å. There are two shorter (2.24 Å) and two longer (2.84 Å) Y(1)-O(2) bond lengths. In the second Y site, Y(2) is bonded to two equivalent O(1) and two equivalent O(4) atoms to form YO4 tetrahedra that share corners with two equivalent Y(2)O4 tetrahedra and corners with two equivalent Mn(1)O5 trigonal bipyramids. There is one shorter (2.18 Å) and one longer (2.20 Å) Y(2)-O(1) bond length. Both Y(2)-O(4) bond lengths are 2.14 Å. Mn(1) is bonded to one O(4), two equivalent O(2), and two equivalent O(3) atoms to form MnO5 trigonal bipyramids that share  a cornercorner with one Y(2)O4 tetrahedra and corners with four equivalent Mn(1)O5 trigonal bipyramids. The Mn(1)-O(4) bond length is 2.19 Å. There is one shorter (2.12 Å) and one longer (2.21 Å) Mn(1)-O(2) bond length. There is one shorter (2.11 Å) and one longer (2.12 Å) Mn(1)-O(3) bond length. There are four inequivalent O sites. In the first O site, O(4) is bonded in a 4-coordinate geometry to two equivalent Sr(1), one Y(2), and one Mn(1) atom. In the second O site, O(1) is bonded to two equivalent Sr(1) and two equivalent Y(2) atoms to form distorted corner-sharing OSr2Y2 tetrahedra. In the third O site, O(2) is bonded in a 6-coordinate geometry to two equivalent Sr(1), two equivalent Y(1), and two equivalent Mn(1) atoms. In the fourth O site, O(3) is bonded in a 4-coordinate geometry to one Sr(1), one Y(1), and two equivalent Mn(1) atoms.