Sr2YCu2SbO7 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. Cu(1) is bonded to one O(4), two equivalent O(2), and two equivalent O(3) atoms to form corner-sharing CuO5 square pyramids. Sb(1) is bonded in a rectangular see-saw-like geometry to two equivalent O(1) and two equivalent O(4) atoms. There are four inequivalent O sites. In the first O site, O(4) is bonded to four equivalent Sr(1), one Cu(1), and one Sb(1) atom to form distorted OSr4CuSb octahedra that share corners with four equivalent O(2)Sr2Y2Cu2 octahedra, corners with four equivalent O(3)Sr2Y2Cu2 octahedra, corners with five equivalent O(4)Sr4CuSb octahedra, edges with four equivalent O(4)Sr4CuSb octahedra, faces with two equivalent O(2)Sr2Y2Cu2 octahedra, and faces with two equivalent O(3)Sr2Y2Cu2 octahedra. The corner-sharing octahedral tilt angles range from 7-53°. In the second O site, O(1) is bonded in a 4-coordinate geometry to two equivalent Sr(1) and two equivalent Sb(1) atoms. In the third O site, O(2) 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(2)Sr2Y2Cu2 octahedra, corners with four equivalent O(3)Sr2Y2Cu2 octahedra, corners with four equivalent O(4)Sr4CuSb octahedra, edges with three equivalent O(3)Sr2Y2Cu2 octahedra, faces with two equivalent O(2)Sr2Y2Cu2 octahedra, faces with two equivalent O(3)Sr2Y2Cu2 octahedra, and faces with two equivalent O(4)Sr4CuSb octahedra. The corner-sharing octahedral tilt angles range from 1-69°. 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(2)Sr2Y2Cu2 octahedra, corners with four equivalent O(3)Sr2Y2Cu2 octahedra, corners with four equivalent O(4)Sr4CuSb octahedra, edges with three equivalent O(2)Sr2Y2Cu2 octahedra, faces with two equivalent O(2)Sr2Y2Cu2 octahedra, faces with two equivalent O(3)Sr2Y2Cu2 octahedra, and faces with two equivalent O(4)Sr4CuSb octahedra. The corner-sharing octahedral tilt angles range from 1-69°.
Sr2YCu2SbO7 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 2.82 Å. There is one shorter (2.78 Å) and one longer (2.85 Å) Sr(1)-O(2) bond length. There is one shorter (2.76 Å) and one longer (2.79 Å) Sr(1)-O(3) bond length. There are a spread of Sr(1)-O(4) bond distances ranging from 2.68-2.88 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 (2.39 Å) and two longer (2.45 Å) Y(1)-O(2) bond lengths. There are two shorter (2.39 Å) and two longer (2.45 Å) Y(1)-O(3) bond lengths. Cu(1) is bonded to one O(4), two equivalent O(2), and two equivalent O(3) atoms to form corner-sharing CuO5 square pyramids. The Cu(1)-O(4) bond length is 2.40 Å. Both Cu(1)-O(2) bond lengths are 1.93 Å. Both Cu(1)-O(3) bond lengths are 1.93 Å. Sb(1) is bonded in a rectangular see-saw-like geometry to two equivalent O(1) and two equivalent O(4) atoms. There is one shorter (2.07 Å) and one longer (2.09 Å) Sb(1)-O(1) bond length. Both Sb(1)-O(4) bond lengths are 2.13 Å. There are four inequivalent O sites. In the first O site, O(4) is bonded to four equivalent Sr(1), one Cu(1), and one Sb(1) atom to form distorted OSr4CuSb octahedra that share corners with four equivalent O(2)Sr2Y2Cu2 octahedra, corners with four equivalent O(3)Sr2Y2Cu2 octahedra, corners with five equivalent O(4)Sr4CuSb octahedra, edges with four equivalent O(4)Sr4CuSb octahedra, faces with two equivalent O(2)Sr2Y2Cu2 octahedra, and faces with two equivalent O(3)Sr2Y2Cu2 octahedra. The corner-sharing octahedral tilt angles range from 7-53°. In the second O site, O(1) is bonded in a 4-coordinate geometry to two equivalent Sr(1) and two equivalent Sb(1) atoms. In the third O site, O(2) 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(2)Sr2Y2Cu2 octahedra, corners with four equivalent O(3)Sr2Y2Cu2 octahedra, corners with four equivalent O(4)Sr4CuSb octahedra, edges with three equivalent O(3)Sr2Y2Cu2 octahedra, faces with two equivalent O(2)Sr2Y2Cu2 octahedra, faces with two equivalent O(3)Sr2Y2Cu2 octahedra, and faces with two equivalent O(4)Sr4CuSb octahedra. The corner-sharing octahedral tilt angles range from 1-69°. 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(2)Sr2Y2Cu2 octahedra, corners with four equivalent O(3)Sr2Y2Cu2 octahedra, corners with four equivalent O(4)Sr4CuSb octahedra, edges with three equivalent O(2)Sr2Y2Cu2 octahedra, faces with two equivalent O(2)Sr2Y2Cu2 octahedra, faces with two equivalent O(3)Sr2Y2Cu2 octahedra, and faces with two equivalent O(4)Sr4CuSb octahedra. The corner-sharing octahedral tilt angles range from 1-69°.