Sr2YCoCu2O7 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. Y(1) is bonded in a body-centered cubic geometry to four equivalent O(2) and four equivalent O(3) atoms. Co(1) is bonded to two equivalent O(1) and two equivalent O(4) atoms to form CoO4 tetrahedra that share corners with two equivalent Cu(1)O5 square pyramids and corners with two equivalent Co(1)O4 tetrahedra. 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 Co(1)O4 tetrahedra. 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 Co(1), and one Cu(1) atom. In the second O site, O(1) is bonded to two equivalent Sr(1) and two equivalent Co(1) atoms to form distorted OSr2Co2 tetrahedra that share corners with four equivalent O(3)Sr2Y2Cu2 octahedra and corners with two equivalent O(1)Sr2Co2 tetrahedra. The corner-sharing octahedral tilt angles range from 50-66°. 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 distorted OSr2Y2Cu2 octahedra that share corners with four equivalent O(3)Sr2Y2Cu2 octahedra, corners with two equivalent O(1)Sr2Co2 tetrahedra, and faces with two equivalent O(3)Sr2Y2Cu2 octahedra. The corner-sharing octahedral tilt angles range from 1-68°.
Sr2YCoCu2O7 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 2.43 Å. There is one shorter (2.79 Å) and one longer (2.84 Å) Sr(1)-O(2) bond length. There is one shorter (2.81 Å) and one longer (2.86 Å) Sr(1)-O(3) bond length. There are a spread of Sr(1)-O(4) bond distances ranging from 2.55-3.05 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 (2.38 Å) and two longer (2.43 Å) Y(1)-O(2) bond lengths. There are two shorter (2.41 Å) and two longer (2.47 Å) Y(1)-O(3) bond lengths. Co(1) is bonded to two equivalent O(1) and two equivalent O(4) atoms to form CoO4 tetrahedra that share corners with two equivalent Cu(1)O5 square pyramids and corners with two equivalent Co(1)O4 tetrahedra. There is one shorter (1.93 Å) and one longer (1.97 Å) Co(1)-O(1) bond length. Both Co(1)-O(4) bond lengths are 1.82 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 Co(1)O4 tetrahedra. The Cu(1)-O(4) bond length is 2.42 Å. Both Cu(1)-O(2) bond lengths are 1.95 Å. There is one shorter (1.93 Å) and one longer (1.94 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 Co(1), and one Cu(1) atom. In the second O site, O(1) is bonded to two equivalent Sr(1) and two equivalent Co(1) atoms to form distorted OSr2Co2 tetrahedra that share corners with four equivalent O(3)Sr2Y2Cu2 octahedra and corners with two equivalent O(1)Sr2Co2 tetrahedra. The corner-sharing octahedral tilt angles range from 50-66°. 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 distorted OSr2Y2Cu2 octahedra that share corners with four equivalent O(3)Sr2Y2Cu2 octahedra, corners with two equivalent O(1)Sr2Co2 tetrahedra, and faces with two equivalent O(3)Sr2Y2Cu2 octahedra. The corner-sharing octahedral tilt angles range from 1-68°.