Sr2Pr2MnCuO8 crystallizes in the monoclinic C2/m space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 9-coordinate geometry to one O(3), one O(5), one O(6), two equivalent O(1), two equivalent O(2), and two equivalent O(7) atoms. In the second Sr site, Sr(2) is bonded in a 9-coordinate geometry to one O(1), one O(5), one O(6), two equivalent O(3), two equivalent O(4), and two equivalent O(7) atoms. There are two inequivalent Pr sites. In the first Pr site, Pr(1) is bonded to one O(3), one O(8), and three equivalent O(2) atoms to form PrO5 trigonal bipyramids that share  a cornercorner with one Mn(1)O5 trigonal bipyramid, corners with three equivalent Pr(1)O5 trigonal bipyramids,  an edgeedge with one Mn(1)O5 trigonal bipyramid, and edges with two equivalent Pr(1)O5 trigonal bipyramids. In the second Pr site, Pr(2) is bonded in a 9-coordinate geometry to two equivalent O(1), two equivalent O(5), two equivalent O(9), and three equivalent O(4) atoms. Mn(1) is bonded to one O(3), one O(7), one O(8), and two equivalent O(6) atoms to form distorted MnO5 trigonal bipyramids that share  a cornercorner with one Cu(1)O6 octahedra,  a cornercorner with one Pr(1)O5 trigonal bipyramid, corners with three equivalent Mn(1)O5 trigonal bipyramids, and  an edgeedge with one Pr(1)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles are 7°. Cu(1) is bonded to one O(1), one O(4), one O(7), one O(9), and two equivalent O(5) atoms to form CuO6 octahedra that share corners with three equivalent Cu(1)O6 octahedra and  a cornercorner with one Mn(1)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 0-7°. There are nine inequivalent O sites. In the first O site, O(7) is bonded to two equivalent Sr(1), two equivalent Sr(2), one Mn(1), and one Cu(1) atom to form distorted OSr4MnCu octahedra that share  a cornercorner with one O(9)Pr4Cu2 octahedra, corners with two equivalent O(4)Sr2Pr3Cu octahedra, corners with four equivalent O(1)Sr3Pr2Cu octahedra, corners with four equivalent O(3)Sr3PrMn trigonal bipyramids, edges with two equivalent O(7)Sr4MnCu octahedra,  a faceface with one O(4)Sr2Pr3Cu octahedra,  a faceface with one O(1)Sr3Pr2Cu octahedra, faces with two equivalent O(5)Sr2Pr2Cu2 octahedra, and  a faceface with one O(3)Sr3PrMn trigonal bipyramid. The corner-sharing octahedral tilt angles range from 3-57°. In the second O site, O(8) is bonded in a square co-planar geometry to two equivalent Pr(1) and two equivalent Mn(1) atoms. In the third O site, O(9) is bonded to four equivalent Pr(2) and two equivalent Cu(1) atoms to form distorted OPr4Cu2 octahedra that share corners with two equivalent O(7)Sr4MnCu octahedra, corners with four equivalent O(1)Sr3Pr2Cu octahedra, corners with eight equivalent O(4)Sr2Pr3Cu octahedra, edges with two equivalent O(9)Pr4Cu2 octahedra, faces with two equivalent O(4)Sr2Pr3Cu octahedra, faces with two equivalent O(1)Sr3Pr2Cu octahedra, and faces with four equivalent O(5)Sr2Pr2Cu2 octahedra. The corner-sharing octahedral tilt angles range from 3-53°. In the fourth O site, O(1) is bonded to one Sr(2), two equivalent Sr(1), two equivalent Pr(2), and one Cu(1) atom to form distorted OSr3Pr2Cu octahedra that share corners with two equivalent O(9)Pr4Cu2 octahedra, corners with three equivalent O(5)Sr2Pr2Cu2 octahedra, corners with three equivalent O(4)Sr2Pr3Cu octahedra, corners with four equivalent O(7)Sr4MnCu octahedra, edges with two equivalent O(1)Sr3Pr2Cu octahedra, edges with three equivalent O(4)Sr2Pr3Cu octahedra, edges with two equivalent O(3)Sr3PrMn trigonal bipyramids,  a faceface with one O(9)Pr4Cu2 octahedra,  a faceface with one O(7)Sr4MnCu octahedra, and faces with two equivalent O(5)Sr2Pr2Cu2 octahedra. The corner-sharing octahedral tilt angles range from 9-57°. In the fifth O site, O(2) is bonded in a 3-coordinate geometry to two equivalent Sr(1) and three equivalent Pr(1) atoms. In the sixth O site, O(3) is bonded to one Sr(1), two equivalent Sr(2), one Pr(1), and one Mn(1) atom to form OSr3PrMn trigonal bipyramids that share corners with two equivalent O(4)Sr2Pr3Cu octahedra, corners with three equivalent O(5)Sr2Pr2Cu2 octahedra, corners with four equivalent O(7)Sr4MnCu octahedra, corners with two equivalent O(3)Sr3PrMn trigonal bipyramids,  an edgeedge with one O(4)Sr2Pr3Cu octahedra, edges with two equivalent O(1)Sr3Pr2Cu octahedra, and  a faceface with one O(7)Sr4MnCu octahedra. The corner-sharing octahedral tilt angles range from 17-54°. In the seventh O site, O(4) is bonded to two equivalent Sr(2), three equivalent Pr(2), and one Cu(1) atom to form distorted OSr2Pr3Cu octahedra that share corners with two equivalent O(7)Sr4MnCu octahedra, corners with three equivalent O(1)Sr3Pr2Cu octahedra, corners with four equivalent O(9)Pr4Cu2 octahedra, corners with four equivalent O(5)Sr2Pr2Cu2 octahedra, corners with two equivalent O(3)Sr3PrMn trigonal bipyramids, edges with three equivalent O(1)Sr3Pr2Cu octahedra, edges with four equivalent O(4)Sr2Pr3Cu octahedra,  an edgeedge with one O(3)Sr3PrMn trigonal bipyramid,  a faceface with one O(9)Pr4Cu2 octahedra,  a faceface with one O(7)Sr4MnCu octahedra, and faces with two equivalent O(5)Sr2Pr2Cu2 octahedra. The corner-sharing octahedral tilt angles range from 9-57°. In the eighth O site, O(5) is bonded to one Sr(1), one Sr(2), two equivalent Pr(2), and two equivalent Cu(1) atoms to form distorted OSr2Pr2Cu2 octahedra that share corners with two equivalent O(5)Sr2Pr2Cu2 octahedra, corners with three equivalent O(1)Sr3Pr2Cu octahedra, corners with four equivalent O(4)Sr2Pr3Cu octahedra, corners with three equivalent O(3)Sr3PrMn trigonal bipyramids,  an edgeedge with one O(5)Sr2Pr2Cu2 octahedra, faces with two equivalent O(9)Pr4Cu2 octahedra, faces with two equivalent O(4)Sr2Pr3Cu octahedra, faces with two equivalent O(1)Sr3Pr2Cu octahedra, and faces with two equivalent O(7)Sr4MnCu octahedra. The corner-sharing octahedral tilt angles range from 7-57°. In the ninth O site, O(6) is bonded in a 2-coordinate geometry to one Sr(1), one Sr(2), and two equivalent Mn(1) atoms.
Sr2Pr2MnCuO8 crystallizes in the monoclinic C2/m space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 9-coordinate geometry to one O(3), one O(5), one O(6), two equivalent O(1), two equivalent O(2), and two equivalent O(7) atoms. The Sr(1)-O(3) bond length is 2.58 Å. The Sr(1)-O(5) bond length is 2.55 Å. The Sr(1)-O(6) bond length is 2.58 Å. Both Sr(1)-O(1) bond lengths are 2.76 Å. Both Sr(1)-O(2) bond lengths are 3.15 Å. Both Sr(1)-O(7) bond lengths are 2.51 Å. In the second Sr site, Sr(2) is bonded in a 9-coordinate geometry to one O(1), one O(5), one O(6), two equivalent O(3), two equivalent O(4), and two equivalent O(7) atoms. The Sr(2)-O(1) bond length is 2.52 Å. The Sr(2)-O(5) bond length is 2.80 Å. The Sr(2)-O(6) bond length is 2.92 Å. Both Sr(2)-O(3) bond lengths are 2.57 Å. Both Sr(2)-O(4) bond lengths are 2.90 Å. Both Sr(2)-O(7) bond lengths are 2.73 Å. There are two inequivalent Pr sites. In the first Pr site, Pr(1) is bonded to one O(3), one O(8), and three equivalent O(2) atoms to form PrO5 trigonal bipyramids that share  a cornercorner with one Mn(1)O5 trigonal bipyramid, corners with three equivalent Pr(1)O5 trigonal bipyramids,  an edgeedge with one Mn(1)O5 trigonal bipyramid, and edges with two equivalent Pr(1)O5 trigonal bipyramids. The Pr(1)-O(3) bond length is 2.31 Å. The Pr(1)-O(8) bond length is 2.25 Å. There are two shorter (2.32 Å) and one longer (2.45 Å) Pr(1)-O(2) bond length. In the second Pr site, Pr(2) is bonded in a 9-coordinate geometry to two equivalent O(1), two equivalent O(5), two equivalent O(9), and three equivalent O(4) atoms. Both Pr(2)-O(1) bond lengths are 2.60 Å. There is one shorter (2.52 Å) and one longer (2.62 Å) Pr(2)-O(5) bond length. Both Pr(2)-O(9) bond lengths are 2.64 Å. There is one shorter (2.40 Å) and two longer (2.60 Å) Pr(2)-O(4) bond lengths. Mn(1) is bonded to one O(3), one O(7), one O(8), and two equivalent O(6) atoms to form distorted MnO5 trigonal bipyramids that share  a cornercorner with one Cu(1)O6 octahedra,  a cornercorner with one Pr(1)O5 trigonal bipyramid, corners with three equivalent Mn(1)O5 trigonal bipyramids, and  an edgeedge with one Pr(1)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles are 7°. The Mn(1)-O(3) bond length is 2.19 Å. The Mn(1)-O(7) bond length is 1.95 Å. The Mn(1)-O(8) bond length is 2.25 Å. Both Mn(1)-O(6) bond lengths are 1.94 Å. Cu(1) is bonded to one O(1), one O(4), one O(7), one O(9), and two equivalent O(5) atoms to form CuO6 octahedra that share corners with three equivalent Cu(1)O6 octahedra and  a cornercorner with one Mn(1)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 0-7°. The Cu(1)-O(1) bond length is 2.15 Å. The Cu(1)-O(4) bond length is 2.26 Å. The Cu(1)-O(7) bond length is 1.98 Å. The Cu(1)-O(9) bond length is 1.91 Å. Both Cu(1)-O(5) bond lengths are 1.91 Å. There are nine inequivalent O sites. In the first O site, O(7) is bonded to two equivalent Sr(1), two equivalent Sr(2), one Mn(1), and one Cu(1) atom to form distorted OSr4MnCu octahedra that share  a cornercorner with one O(9)Pr4Cu2 octahedra, corners with two equivalent O(4)Sr2Pr3Cu octahedra, corners with four equivalent O(1)Sr3Pr2Cu octahedra, corners with four equivalent O(3)Sr3PrMn trigonal bipyramids, edges with two equivalent O(7)Sr4MnCu octahedra,  a faceface with one O(4)Sr2Pr3Cu octahedra,  a faceface with one O(1)Sr3Pr2Cu octahedra, faces with two equivalent O(5)Sr2Pr2Cu2 octahedra, and  a faceface with one O(3)Sr3PrMn trigonal bipyramid. The corner-sharing octahedral tilt angles range from 3-57°. In the second O site, O(8) is bonded in a square co-planar geometry to two equivalent Pr(1) and two equivalent Mn(1) atoms. In the third O site, O(9) is bonded to four equivalent Pr(2) and two equivalent Cu(1) atoms to form distorted OPr4Cu2 octahedra that share corners with two equivalent O(7)Sr4MnCu octahedra, corners with four equivalent O(1)Sr3Pr2Cu octahedra, corners with eight equivalent O(4)Sr2Pr3Cu octahedra, edges with two equivalent O(9)Pr4Cu2 octahedra, faces with two equivalent O(4)Sr2Pr3Cu octahedra, faces with two equivalent O(1)Sr3Pr2Cu octahedra, and faces with four equivalent O(5)Sr2Pr2Cu2 octahedra. The corner-sharing octahedral tilt angles range from 3-53°. In the fourth O site, O(1) is bonded to one Sr(2), two equivalent Sr(1), two equivalent Pr(2), and one Cu(1) atom to form distorted OSr3Pr2Cu octahedra that share corners with two equivalent O(9)Pr4Cu2 octahedra, corners with three equivalent O(5)Sr2Pr2Cu2 octahedra, corners with three equivalent O(4)Sr2Pr3Cu octahedra, corners with four equivalent O(7)Sr4MnCu octahedra, edges with two equivalent O(1)Sr3Pr2Cu octahedra, edges with three equivalent O(4)Sr2Pr3Cu octahedra, edges with two equivalent O(3)Sr3PrMn trigonal bipyramids,  a faceface with one O(9)Pr4Cu2 octahedra,  a faceface with one O(7)Sr4MnCu octahedra, and faces with two equivalent O(5)Sr2Pr2Cu2 octahedra. The corner-sharing octahedral tilt angles range from 9-57°. In the fifth O site, O(2) is bonded in a 3-coordinate geometry to two equivalent Sr(1) and three equivalent Pr(1) atoms. In the sixth O site, O(3) is bonded to one Sr(1), two equivalent Sr(2), one Pr(1), and one Mn(1) atom to form OSr3PrMn trigonal bipyramids that share corners with two equivalent O(4)Sr2Pr3Cu octahedra, corners with three equivalent O(5)Sr2Pr2Cu2 octahedra, corners with four equivalent O(7)Sr4MnCu octahedra, corners with two equivalent O(3)Sr3PrMn trigonal bipyramids,  an edgeedge with one O(4)Sr2Pr3Cu octahedra, edges with two equivalent O(1)Sr3Pr2Cu octahedra, and  a faceface with one O(7)Sr4MnCu octahedra. The corner-sharing octahedral tilt angles range from 17-54°. In the seventh O site, O(4) is bonded to two equivalent Sr(2), three equivalent Pr(2), and one Cu(1) atom to form distorted OSr2Pr3Cu octahedra that share corners with two equivalent O(7)Sr4MnCu octahedra, corners with three equivalent O(1)Sr3Pr2Cu octahedra, corners with four equivalent O(9)Pr4Cu2 octahedra, corners with four equivalent O(5)Sr2Pr2Cu2 octahedra, corners with two equivalent O(3)Sr3PrMn trigonal bipyramids, edges with three equivalent O(1)Sr3Pr2Cu octahedra, edges with four equivalent O(4)Sr2Pr3Cu octahedra,  an edgeedge with one O(3)Sr3PrMn trigonal bipyramid,  a faceface with one O(9)Pr4Cu2 octahedra,  a faceface with one O(7)Sr4MnCu octahedra, and faces with two equivalent O(5)Sr2Pr2Cu2 octahedra. The corner-sharing octahedral tilt angles range from 9-57°. In the eighth O site, O(5) is bonded to one Sr(1), one Sr(2), two equivalent Pr(2), and two equivalent Cu(1) atoms to form distorted OSr2Pr2Cu2 octahedra that share corners with two equivalent O(5)Sr2Pr2Cu2 octahedra, corners with three equivalent O(1)Sr3Pr2Cu octahedra, corners with four equivalent O(4)Sr2Pr3Cu octahedra, corners with three equivalent O(3)Sr3PrMn trigonal bipyramids,  an edgeedge with one O(5)Sr2Pr2Cu2 octahedra, faces with two equivalent O(9)Pr4Cu2 octahedra, faces with two equivalent O(4)Sr2Pr3Cu octahedra, faces with two equivalent O(1)Sr3Pr2Cu octahedra, and faces with two equivalent O(7)Sr4MnCu octahedra. The corner-sharing octahedral tilt angles range from 7-57°. In the ninth O site, O(6) is bonded in a 2-coordinate geometry to one Sr(1), one Sr(2), and two equivalent Mn(1) atoms.