Sr2Y2Cu2O7 crystallizes in the orthorhombic Ima2 space group. Sr(1) is bonded in a 9-coordinate geometry to one O(1), two equivalent O(2), two equivalent O(3), and four equivalent O(4) atoms. There are two inequivalent Y sites. In the first Y site, Y(1) is bonded in a body-centered cubic geometry to four equivalent O(2) and four equivalent O(3) atoms. In the second Y site, Y(2) is bonded to two equivalent O(1) and two equivalent O(4) atoms to form distorted YO4 trigonal pyramids that share corners with two equivalent Cu(1)O5 square pyramids and corners with two equivalent Y(2)O4 trigonal pyramids. Cu(1) is bonded to one O(4), two equivalent O(2), and two equivalent O(3) atoms to form distorted CuO5 square pyramids that share corners with four equivalent Cu(1)O5 square pyramids and  a cornercorner with one Y(2)O4 trigonal pyramid. There are four inequivalent O sites. In the first O site, O(4) is bonded in a 6-coordinate geometry to four equivalent Sr(1), one Y(2), and one Cu(1) atom. In the second O site, O(1) is bonded in a 4-coordinate geometry to two equivalent Sr(1) and two equivalent Y(2) atoms. 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 Cu(1) atoms. In the fourth O site, O(3) is bonded to two equivalent Sr(1), two equivalent Y(1), and two equivalent Cu(1) atoms to form a mixture of distorted face and corner-sharing OSr2Y2Cu2 octahedra. The corner-sharing octahedral tilt angles range from 1-68°.
Sr2Y2Cu2O7 crystallizes in the orthorhombic Ima2 space group. Sr(1) is bonded in a 9-coordinate geometry to one O(1), two equivalent O(2), two equivalent O(3), and four equivalent O(4) atoms. The Sr(1)-O(1) bond length is 2.73 Å. There is one shorter (2.79 Å) and one longer (2.84 Å) Sr(1)-O(2) bond length. There is one shorter (2.77 Å) and one longer (2.82 Å) Sr(1)-O(3) bond length. There are a spread of Sr(1)-O(4) bond distances ranging from 2.54-3.04 Å. There are two inequivalent Y sites. In the first Y site, 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 (2.37 Å) and two longer (2.41 Å) Y(1)-O(2) bond lengths. There are two shorter (2.42 Å) and two longer (2.48 Å) Y(1)-O(3) bond lengths. In the second Y site, Y(2) is bonded to two equivalent O(1) and two equivalent O(4) atoms to form distorted YO4 trigonal pyramids that share corners with two equivalent Cu(1)O5 square pyramids and corners with two equivalent Y(2)O4 trigonal pyramids. There is one shorter (2.22 Å) and one longer (2.24 Å) Y(2)-O(1) bond length. Both Y(2)-O(4) bond lengths are 2.17 Å. Cu(1) is bonded to one O(4), two equivalent O(2), and two equivalent O(3) atoms to form distorted CuO5 square pyramids that share corners with four equivalent Cu(1)O5 square pyramids and  a cornercorner with one Y(2)O4 trigonal pyramid. The Cu(1)-O(4) bond length is 2.45 Å. There is one shorter (1.93 Å) and one longer (1.94 Å) Cu(1)-O(2) bond length. There is one shorter (1.92 Å) and one longer (1.93 Å) Cu(1)-O(3) bond length. There are four inequivalent O sites. In the first O site, O(4) is bonded in a 6-coordinate geometry to four equivalent Sr(1), one Y(2), and one Cu(1) atom. In the second O site, O(1) is bonded in a 4-coordinate geometry to two equivalent Sr(1) and two equivalent Y(2) atoms. 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 Cu(1) atoms. In the fourth O site, O(3) is bonded to two equivalent Sr(1), two equivalent Y(1), and two equivalent Cu(1) atoms to form a mixture of distorted face and corner-sharing OSr2Y2Cu2 octahedra. The corner-sharing octahedral tilt angles range from 1-68°.