Sr9Zn4(CuO7)2 crystallizes in the monoclinic C2/m space group. There are five inequivalent Sr sites. In the first Sr site, Sr(1) is bonded to one O(6), two equivalent O(1), and three equivalent O(5) atoms to form SrO6 octahedra that share  a cornercorner with one Sr(5)O6 octahedra, corners with two equivalent Sr(3)O6 octahedra, edges with three equivalent Sr(3)O6 octahedra, edges with four equivalent Sr(1)O6 octahedra, and edges with two equivalent Zn(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 1-59°. In the second Sr site, Sr(2) is bonded in a 7-coordinate geometry to two equivalent O(1), two equivalent O(4), and three equivalent O(2) atoms. In the third Sr site, Sr(3) is bonded to one O(1), one O(7), two equivalent O(2), and two equivalent O(5) atoms to form distorted SrO6 octahedra that share corners with two equivalent Sr(1)O6 octahedra,  a cornercorner with one Zn(1)O4 tetrahedra, edges with two equivalent Sr(3)O6 octahedra, edges with three equivalent Sr(1)O6 octahedra, and edges with two equivalent Zn(2)O4 tetrahedra. The corner-sharing octahedral tilt angles are 1°. In the fourth Sr site, Sr(4) is bonded in a 6-coordinate geometry to one O(6), one O(7), two equivalent O(3), and two equivalent O(4) atoms. In the fifth Sr site, Sr(5) is bonded to two equivalent O(6) and four equivalent O(3) atoms to form SrO6 octahedra that share corners with two equivalent Sr(1)O6 octahedra, corners with four equivalent Zn(1)O4 tetrahedra, and edges with two equivalent Sr(5)O6 octahedra. The corner-sharing octahedral tilt angles are 59°. Cu(1) is bonded in a linear geometry to one O(3) and one O(5) atom. There are two inequivalent Zn sites. In the first Zn site, Zn(1) is bonded to one O(1), one O(4), and two equivalent O(6) atoms to form ZnO4 tetrahedra that share  a cornercorner with one Sr(3)O6 octahedra, corners with two equivalent Sr(5)O6 octahedra,  a cornercorner with one Zn(2)O4 tetrahedra, corners with two equivalent Zn(1)O4 tetrahedra, and edges with two equivalent Sr(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 3-71°. In the second Zn site, Zn(2) is bonded to one O(2), one O(4), and two equivalent O(7) atoms to form ZnO4 tetrahedra that share  a cornercorner with one Zn(1)O4 tetrahedra, corners with two equivalent Zn(2)O4 tetrahedra, and edges with two equivalent Sr(3)O6 octahedra. There are seven inequivalent O sites. In the first O site, O(3) is bonded to two equivalent Sr(4), two equivalent Sr(5), and one Cu(1) atom to form distorted OSr4Cu trigonal bipyramids that share  a cornercorner with one O(5)Sr5Cu octahedra, corners with two equivalent O(7)Sr2Zn2 tetrahedra, corners with two equivalent O(3)Sr4Cu trigonal bipyramids, and edges with three equivalent O(3)Sr4Cu trigonal bipyramids. The corner-sharing octahedra are not tilted. In the second O site, O(4) is bonded in a 6-coordinate geometry to two equivalent Sr(2), two equivalent Sr(4), one Zn(1), and one Zn(2) atom. In the third O site, O(5) is bonded to two equivalent Sr(3), three equivalent Sr(1), and one Cu(1) atom to form OSr5Cu octahedra that share corners with two equivalent O(1)Sr5Zn octahedra, corners with two equivalent O(2)Sr5Zn octahedra, corners with two equivalent O(7)Sr2Zn2 tetrahedra,  a cornercorner with one O(3)Sr4Cu trigonal bipyramid,  an edgeedge with one O(2)Sr5Zn octahedra, edges with three equivalent O(1)Sr5Zn octahedra, and edges with four equivalent O(5)Sr5Cu octahedra. The corner-sharing octahedral tilt angles range from 4-8°. In the fourth O site, O(6) is bonded in a 5-coordinate geometry to one Sr(1), one Sr(4), one Sr(5), and two equivalent Zn(1) atoms. In the fifth O site, O(7) is bonded to one Sr(3), one Sr(4), and two equivalent Zn(2) atoms to form distorted OSr2Zn2 tetrahedra that share  a cornercorner with one O(1)Sr5Zn octahedra, corners with two equivalent O(5)Sr5Cu octahedra, corners with two equivalent O(7)Sr2Zn2 tetrahedra, corners with two equivalent O(3)Sr4Cu trigonal bipyramids, and edges with two equivalent O(2)Sr5Zn octahedra. The corner-sharing octahedral tilt angles range from 23-69°. In the sixth O site, O(1) is bonded to one Sr(3), two equivalent Sr(1), two equivalent Sr(2), and one Zn(1) atom to form distorted OSr5Zn octahedra that share corners with two equivalent O(5)Sr5Cu octahedra, corners with two equivalent O(2)Sr5Zn octahedra,  a cornercorner with one O(7)Sr2Zn2 tetrahedra, edges with two equivalent O(1)Sr5Zn octahedra, edges with three equivalent O(5)Sr5Cu octahedra, and edges with three equivalent O(2)Sr5Zn octahedra. The corner-sharing octahedral tilt angles range from 4-12°. In the seventh O site, O(2) is bonded to two equivalent Sr(3), three equivalent Sr(2), and one Zn(2) atom to form OSr5Zn octahedra that share corners with two equivalent O(5)Sr5Cu octahedra, corners with two equivalent O(1)Sr5Zn octahedra,  an edgeedge with one O(5)Sr5Cu octahedra, edges with three equivalent O(1)Sr5Zn octahedra, edges with four equivalent O(2)Sr5Zn octahedra, and edges with two equivalent O(7)Sr2Zn2 tetrahedra. The corner-sharing octahedral tilt angles range from 8-12°.
Sr9Zn4(CuO7)2 crystallizes in the monoclinic C2/m space group. There are five inequivalent Sr sites. In the first Sr site, Sr(1) is bonded to one O(6), two equivalent O(1), and three equivalent O(5) atoms to form SrO6 octahedra that share  a cornercorner with one Sr(5)O6 octahedra, corners with two equivalent Sr(3)O6 octahedra, edges with three equivalent Sr(3)O6 octahedra, edges with four equivalent Sr(1)O6 octahedra, and edges with two equivalent Zn(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 1-59°. The Sr(1)-O(6) bond length is 2.48 Å. Both Sr(1)-O(1) bond lengths are 2.58 Å. There is one shorter (2.57 Å) and two longer (2.65 Å) Sr(1)-O(5) bond lengths. In the second Sr site, Sr(2) is bonded in a 7-coordinate geometry to two equivalent O(1), two equivalent O(4), and three equivalent O(2) atoms. Both Sr(2)-O(1) bond lengths are 2.70 Å. Both Sr(2)-O(4) bond lengths are 2.86 Å. There is one shorter (2.56 Å) and two longer (2.67 Å) Sr(2)-O(2) bond lengths. In the third Sr site, Sr(3) is bonded to one O(1), one O(7), two equivalent O(2), and two equivalent O(5) atoms to form distorted SrO6 octahedra that share corners with two equivalent Sr(1)O6 octahedra,  a cornercorner with one Zn(1)O4 tetrahedra, edges with two equivalent Sr(3)O6 octahedra, edges with three equivalent Sr(1)O6 octahedra, and edges with two equivalent Zn(2)O4 tetrahedra. The corner-sharing octahedral tilt angles are 1°. The Sr(3)-O(1) bond length is 2.45 Å. The Sr(3)-O(7) bond length is 2.60 Å. Both Sr(3)-O(2) bond lengths are 2.58 Å. Both Sr(3)-O(5) bond lengths are 2.71 Å. In the fourth Sr site, Sr(4) is bonded in a 6-coordinate geometry to one O(6), one O(7), two equivalent O(3), and two equivalent O(4) atoms. The Sr(4)-O(6) bond length is 2.88 Å. The Sr(4)-O(7) bond length is 2.46 Å. Both Sr(4)-O(3) bond lengths are 2.60 Å. Both Sr(4)-O(4) bond lengths are 2.55 Å. In the fifth Sr site, Sr(5) is bonded to two equivalent O(6) and four equivalent O(3) atoms to form SrO6 octahedra that share corners with two equivalent Sr(1)O6 octahedra, corners with four equivalent Zn(1)O4 tetrahedra, and edges with two equivalent Sr(5)O6 octahedra. The corner-sharing octahedral tilt angles are 59°. Both Sr(5)-O(6) bond lengths are 2.45 Å. All Sr(5)-O(3) bond lengths are 2.62 Å. Cu(1) is bonded in a linear geometry to one O(3) and one O(5) atom. The Cu(1)-O(3) bond length is 1.81 Å. The Cu(1)-O(5) bond length is 1.86 Å. There are two inequivalent Zn sites. In the first Zn site, Zn(1) is bonded to one O(1), one O(4), and two equivalent O(6) atoms to form ZnO4 tetrahedra that share  a cornercorner with one Sr(3)O6 octahedra, corners with two equivalent Sr(5)O6 octahedra,  a cornercorner with one Zn(2)O4 tetrahedra, corners with two equivalent Zn(1)O4 tetrahedra, and edges with two equivalent Sr(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 3-71°. The Zn(1)-O(1) bond length is 2.05 Å. The Zn(1)-O(4) bond length is 1.99 Å. Both Zn(1)-O(6) bond lengths are 1.97 Å. In the second Zn site, Zn(2) is bonded to one O(2), one O(4), and two equivalent O(7) atoms to form ZnO4 tetrahedra that share  a cornercorner with one Zn(1)O4 tetrahedra, corners with two equivalent Zn(2)O4 tetrahedra, and edges with two equivalent Sr(3)O6 octahedra. The Zn(2)-O(2) bond length is 2.10 Å. The Zn(2)-O(4) bond length is 1.97 Å. Both Zn(2)-O(7) bond lengths are 2.01 Å. There are seven inequivalent O sites. In the first O site, O(3) is bonded to two equivalent Sr(4), two equivalent Sr(5), and one Cu(1) atom to form distorted OSr4Cu trigonal bipyramids that share  a cornercorner with one O(5)Sr5Cu octahedra, corners with two equivalent O(7)Sr2Zn2 tetrahedra, corners with two equivalent O(3)Sr4Cu trigonal bipyramids, and edges with three equivalent O(3)Sr4Cu trigonal bipyramids. The corner-sharing octahedra are not tilted. In the second O site, O(4) is bonded in a 6-coordinate geometry to two equivalent Sr(2), two equivalent Sr(4), one Zn(1), and one Zn(2) atom. In the third O site, O(5) is bonded to two equivalent Sr(3), three equivalent Sr(1), and one Cu(1) atom to form OSr5Cu octahedra that share corners with two equivalent O(1)Sr5Zn octahedra, corners with two equivalent O(2)Sr5Zn octahedra, corners with two equivalent O(7)Sr2Zn2 tetrahedra,  a cornercorner with one O(3)Sr4Cu trigonal bipyramid,  an edgeedge with one O(2)Sr5Zn octahedra, edges with three equivalent O(1)Sr5Zn octahedra, and edges with four equivalent O(5)Sr5Cu octahedra. The corner-sharing octahedral tilt angles range from 4-8°. In the fourth O site, O(6) is bonded in a 5-coordinate geometry to one Sr(1), one Sr(4), one Sr(5), and two equivalent Zn(1) atoms. In the fifth O site, O(7) is bonded to one Sr(3), one Sr(4), and two equivalent Zn(2) atoms to form distorted OSr2Zn2 tetrahedra that share  a cornercorner with one O(1)Sr5Zn octahedra, corners with two equivalent O(5)Sr5Cu octahedra, corners with two equivalent O(7)Sr2Zn2 tetrahedra, corners with two equivalent O(3)Sr4Cu trigonal bipyramids, and edges with two equivalent O(2)Sr5Zn octahedra. The corner-sharing octahedral tilt angles range from 23-69°. In the sixth O site, O(1) is bonded to one Sr(3), two equivalent Sr(1), two equivalent Sr(2), and one Zn(1) atom to form distorted OSr5Zn octahedra that share corners with two equivalent O(5)Sr5Cu octahedra, corners with two equivalent O(2)Sr5Zn octahedra,  a cornercorner with one O(7)Sr2Zn2 tetrahedra, edges with two equivalent O(1)Sr5Zn octahedra, edges with three equivalent O(5)Sr5Cu octahedra, and edges with three equivalent O(2)Sr5Zn octahedra. The corner-sharing octahedral tilt angles range from 4-12°. In the seventh O site, O(2) is bonded to two equivalent Sr(3), three equivalent Sr(2), and one Zn(2) atom to form OSr5Zn octahedra that share corners with two equivalent O(5)Sr5Cu octahedra, corners with two equivalent O(1)Sr5Zn octahedra,  an edgeedge with one O(5)Sr5Cu octahedra, edges with three equivalent O(1)Sr5Zn octahedra, edges with four equivalent O(2)Sr5Zn octahedra, and edges with two equivalent O(7)Sr2Zn2 tetrahedra. The corner-sharing octahedral tilt angles range from 8-12°.