Sr2YMn2AlO7 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 three equivalent O(4) atoms. Y(1) is bonded in a 4-coordinate geometry to two equivalent O(3) and four equivalent O(2) atoms. Mn(1) is bonded to one O(4), two equivalent O(2), and two equivalent O(3) atoms to form MnO5 square pyramids that share corners with four equivalent Mn(1)O5 square pyramids and  a cornercorner with one Al(1)O4 tetrahedra. Al(1) is bonded to two equivalent O(1) and two equivalent O(4) atoms to form AlO4 tetrahedra that share corners with two equivalent Mn(1)O5 square pyramids and corners with two equivalent Al(1)O4 tetrahedra. There are four inequivalent O sites. In the first O site, O(4) is bonded in a 5-coordinate geometry to three equivalent Sr(1), one Mn(1), and one Al(1) atom. In the second O site, O(1) is bonded to two equivalent Sr(1) and two equivalent Al(1) atoms to form distorted corner-sharing OSr2Al2 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 distorted rectangular see-saw-like geometry to one Sr(1), one Y(1), and two equivalent Mn(1) atoms.
Sr2YMn2AlO7 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 three equivalent O(4) atoms. The Sr(1)-O(1) bond length is 2.62 Å. The Sr(1)-O(3) bond length is 2.51 Å. There is one shorter (2.56 Å) and one longer (3.04 Å) Sr(1)-O(2) bond length. There are a spread of Sr(1)-O(4) bond distances ranging from 2.49-3.07 Å. 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 (2.81 Å) Y(1)-O(2) bond lengths. Mn(1) is bonded to one O(4), two equivalent O(2), and two equivalent O(3) atoms to form MnO5 square pyramids that share corners with four equivalent Mn(1)O5 square pyramids and  a cornercorner with one Al(1)O4 tetrahedra. The Mn(1)-O(4) bond length is 2.19 Å. There is one shorter (2.11 Å) and one longer (2.19 Å) Mn(1)-O(2) bond length. There is one shorter (2.10 Å) and one longer (2.12 Å) Mn(1)-O(3) bond length. Al(1) is bonded to two equivalent O(1) and two equivalent O(4) atoms to form AlO4 tetrahedra that share corners with two equivalent Mn(1)O5 square pyramids and corners with two equivalent Al(1)O4 tetrahedra. Both Al(1)-O(1) bond lengths are 1.82 Å. Both Al(1)-O(4) bond lengths are 1.76 Å. There are four inequivalent O sites. In the first O site, O(4) is bonded in a 5-coordinate geometry to three equivalent Sr(1), one Mn(1), and one Al(1) atom. In the second O site, O(1) is bonded to two equivalent Sr(1) and two equivalent Al(1) atoms to form distorted corner-sharing OSr2Al2 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 distorted rectangular see-saw-like geometry to one Sr(1), one Y(1), and two equivalent Mn(1) atoms.