Sr2Nd2MnCuO8 is (La,Ba)CuO4-derived structured and crystallizes in the triclinic P-1 space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 9-coordinate geometry to two equivalent O(2), two equivalent O(6), two equivalent O(9), and three equivalent O(5) atoms. In the second Sr site, Sr(2) is bonded in a 9-coordinate geometry to one O(6), one O(8), one O(9), two equivalent O(1), two equivalent O(4), and two equivalent O(5) atoms. There are two inequivalent Nd sites. In the first Nd site, Nd(1) is bonded in a 9-coordinate geometry to one O(4), one O(8), one O(9), two equivalent O(1), two equivalent O(6), and two equivalent O(7) atoms. In the second Nd site, Nd(2) is bonded in a 9-coordinate geometry to two equivalent O(3), two equivalent O(4), two equivalent O(8), and three equivalent O(7) atoms. Mn(1) is bonded to one O(1), one O(2), one O(5), one O(6), and two equivalent O(9) atoms to form MnO6 octahedra that share  a cornercorner with one Cu(1)O6 octahedra and corners with three equivalent Mn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-5°. Cu(1) is bonded to one O(1), one O(3), one O(4), one O(7), and two equivalent O(8) atoms to form CuO6 octahedra that share  a cornercorner with one Mn(1)O6 octahedra and corners with three equivalent Cu(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-5°. There are nine inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Sr(2), two equivalent Nd(1), one Mn(1), and one Cu(1) atom to form distorted OSr2Nd2MnCu octahedra that share  a cornercorner with one O(3)Nd4Cu2 octahedra,  a cornercorner with one O(2)Sr4Mn2 octahedra, corners with two equivalent O(5)Sr5Mn octahedra, corners with four equivalent O(6)Sr3Nd2Mn octahedra, edges with two equivalent O(1)Sr2Nd2MnCu octahedra,  a faceface with one O(6)Sr3Nd2Mn octahedra,  a faceface with one O(5)Sr5Mn octahedra, faces with two equivalent O(9)Sr3NdMn2 octahedra, and faces with two equivalent O(8)SrNd3Cu2 octahedra. The corner-sharing octahedral tilt angles range from 2-57°. In the second O site, O(2) is bonded to four equivalent Sr(1) and two equivalent Mn(1) atoms to form distorted OSr4Mn2 octahedra that share corners with two equivalent O(1)Sr2Nd2MnCu octahedra, corners with four equivalent O(6)Sr3Nd2Mn octahedra, corners with eight equivalent O(5)Sr5Mn octahedra, edges with two equivalent O(2)Sr4Mn2 octahedra, faces with two equivalent O(6)Sr3Nd2Mn octahedra, faces with two equivalent O(5)Sr5Mn octahedra, and faces with four equivalent O(9)Sr3NdMn2 octahedra. The corner-sharing octahedral tilt angles range from 2-58°. In the third O site, O(3) is bonded to four equivalent Nd(2) and two equivalent Cu(1) atoms to form distorted ONd4Cu2 octahedra that share corners with two equivalent O(1)Sr2Nd2MnCu octahedra, edges with two equivalent O(3)Nd4Cu2 octahedra, and faces with four equivalent O(8)SrNd3Cu2 octahedra. The corner-sharing octahedral tilt angles are 2°. In the fourth O site, O(4) is bonded in a 6-coordinate geometry to two equivalent Sr(2), one Nd(1), two equivalent Nd(2), and one Cu(1) atom. In the fifth O site, O(5) is bonded to two equivalent Sr(2), three equivalent Sr(1), and one Mn(1) atom to form distorted OSr5Mn octahedra that share corners with two equivalent O(1)Sr2Nd2MnCu octahedra, corners with two equivalent O(8)SrNd3Cu2 octahedra, corners with three equivalent O(6)Sr3Nd2Mn octahedra, corners with four equivalent O(9)Sr3NdMn2 octahedra, corners with four equivalent O(2)Sr4Mn2 octahedra, edges with three equivalent O(6)Sr3Nd2Mn octahedra, edges with four equivalent O(5)Sr5Mn octahedra,  a faceface with one O(1)Sr2Nd2MnCu octahedra,  a faceface with one O(2)Sr4Mn2 octahedra, and faces with two equivalent O(9)Sr3NdMn2 octahedra. The corner-sharing octahedral tilt angles range from 4-57°. In the sixth O site, O(6) is bonded to one Sr(2), two equivalent Sr(1), two equivalent Nd(1), and one Mn(1) atom to form distorted OSr3Nd2Mn octahedra that share corners with two equivalent O(2)Sr4Mn2 octahedra, corners with three equivalent O(9)Sr3NdMn2 octahedra, corners with three equivalent O(5)Sr5Mn octahedra, corners with three equivalent O(8)SrNd3Cu2 octahedra, corners with four equivalent O(1)Sr2Nd2MnCu octahedra, edges with two equivalent O(6)Sr3Nd2Mn octahedra, edges with three equivalent O(5)Sr5Mn octahedra,  a faceface with one O(1)Sr2Nd2MnCu octahedra,  a faceface with one O(2)Sr4Mn2 octahedra, and faces with two equivalent O(9)Sr3NdMn2 octahedra. The corner-sharing octahedral tilt angles range from 4-58°. In the seventh O site, O(7) is bonded in a 6-coordinate geometry to two equivalent Nd(1), three equivalent Nd(2), and one Cu(1) atom. In the eighth O site, O(8) is bonded to one Sr(2), one Nd(1), two equivalent Nd(2), and two equivalent Cu(1) atoms to form distorted OSrNd3Cu2 octahedra that share corners with two equivalent O(5)Sr5Mn octahedra, corners with two equivalent O(8)SrNd3Cu2 octahedra, corners with three equivalent O(6)Sr3Nd2Mn octahedra,  an edgeedge with one O(9)Sr3NdMn2 octahedra,  an edgeedge with one O(8)SrNd3Cu2 octahedra, faces with two equivalent O(3)Nd4Cu2 octahedra, and faces with two equivalent O(1)Sr2Nd2MnCu octahedra. The corner-sharing octahedral tilt angles range from 5-57°. In the ninth O site, O(9) is bonded to one Sr(2), two equivalent Sr(1), one Nd(1), and two equivalent Mn(1) atoms to form distorted OSr3NdMn2 octahedra that share corners with two equivalent O(9)Sr3NdMn2 octahedra, corners with three equivalent O(6)Sr3Nd2Mn octahedra, corners with four equivalent O(5)Sr5Mn octahedra,  an edgeedge with one O(9)Sr3NdMn2 octahedra,  an edgeedge with one O(8)SrNd3Cu2 octahedra, faces with two equivalent O(1)Sr2Nd2MnCu octahedra, faces with two equivalent O(6)Sr3Nd2Mn octahedra, faces with two equivalent O(2)Sr4Mn2 octahedra, and faces with two equivalent O(5)Sr5Mn octahedra. The corner-sharing octahedral tilt angles range from 5-55°.
Sr2Nd2MnCuO8 is (La,Ba)CuO4-derived structured and crystallizes in the triclinic P-1 space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 9-coordinate geometry to two equivalent O(2), two equivalent O(6), two equivalent O(9), and three equivalent O(5) atoms. There is one shorter (2.64 Å) and one longer (2.65 Å) Sr(1)-O(2) bond length. Both Sr(1)-O(6) bond lengths are 2.85 Å. There is one shorter (2.67 Å) and one longer (2.71 Å) Sr(1)-O(9) bond length. There are a spread of Sr(1)-O(5) bond distances ranging from 2.54-2.75 Å. In the second Sr site, Sr(2) is bonded in a 9-coordinate geometry to one O(6), one O(8), one O(9), two equivalent O(1), two equivalent O(4), and two equivalent O(5) atoms. The Sr(2)-O(6) bond length is 2.49 Å. The Sr(2)-O(8) bond length is 2.70 Å. The Sr(2)-O(9) bond length is 2.69 Å. There is one shorter (2.69 Å) and one longer (2.70 Å) Sr(2)-O(1) bond length. There is one shorter (2.88 Å) and one longer (2.90 Å) Sr(2)-O(4) bond length. There is one shorter (2.71 Å) and one longer (2.73 Å) Sr(2)-O(5) bond length. There are two inequivalent Nd sites. In the first Nd site, Nd(1) is bonded in a 9-coordinate geometry to one O(4), one O(8), one O(9), two equivalent O(1), two equivalent O(6), and two equivalent O(7) atoms. The Nd(1)-O(4) bond length is 2.32 Å. The Nd(1)-O(8) bond length is 2.55 Å. The Nd(1)-O(9) bond length is 2.53 Å. There is one shorter (2.54 Å) and one longer (2.55 Å) Nd(1)-O(1) bond length. There is one shorter (2.66 Å) and one longer (2.67 Å) Nd(1)-O(6) bond length. There is one shorter (2.70 Å) and one longer (2.76 Å) Nd(1)-O(7) bond length. In the second Nd site, Nd(2) is bonded in a 9-coordinate geometry to two equivalent O(3), two equivalent O(4), two equivalent O(8), and three equivalent O(7) atoms. There is one shorter (2.60 Å) and one longer (2.64 Å) Nd(2)-O(3) bond length. There is one shorter (2.58 Å) and one longer (2.59 Å) Nd(2)-O(4) bond length. There is one shorter (2.54 Å) and one longer (2.60 Å) Nd(2)-O(8) bond length. There are a spread of Nd(2)-O(7) bond distances ranging from 2.30-2.82 Å. Mn(1) is bonded to one O(1), one O(2), one O(5), one O(6), and two equivalent O(9) atoms to form MnO6 octahedra that share  a cornercorner with one Cu(1)O6 octahedra and corners with three equivalent Mn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-5°. The Mn(1)-O(1) bond length is 1.93 Å. The Mn(1)-O(2) bond length is 1.94 Å. The Mn(1)-O(5) bond length is 2.00 Å. The Mn(1)-O(6) bond length is 2.05 Å. Both Mn(1)-O(9) bond lengths are 1.92 Å. Cu(1) is bonded to one O(1), one O(3), one O(4), one O(7), and two equivalent O(8) atoms to form CuO6 octahedra that share  a cornercorner with one Mn(1)O6 octahedra and corners with three equivalent Cu(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-5°. The Cu(1)-O(1) bond length is 1.91 Å. The Cu(1)-O(3) bond length is 1.89 Å. The Cu(1)-O(4) bond length is 2.32 Å. The Cu(1)-O(7) bond length is 2.29 Å. Both Cu(1)-O(8) bond lengths are 1.92 Å. There are nine inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Sr(2), two equivalent Nd(1), one Mn(1), and one Cu(1) atom to form distorted OSr2Nd2MnCu octahedra that share  a cornercorner with one O(3)Nd4Cu2 octahedra,  a cornercorner with one O(2)Sr4Mn2 octahedra, corners with two equivalent O(5)Sr5Mn octahedra, corners with four equivalent O(6)Sr3Nd2Mn octahedra, edges with two equivalent O(1)Sr2Nd2MnCu octahedra,  a faceface with one O(6)Sr3Nd2Mn octahedra,  a faceface with one O(5)Sr5Mn octahedra, faces with two equivalent O(9)Sr3NdMn2 octahedra, and faces with two equivalent O(8)SrNd3Cu2 octahedra. The corner-sharing octahedral tilt angles range from 2-57°. In the second O site, O(2) is bonded to four equivalent Sr(1) and two equivalent Mn(1) atoms to form distorted OSr4Mn2 octahedra that share corners with two equivalent O(1)Sr2Nd2MnCu octahedra, corners with four equivalent O(6)Sr3Nd2Mn octahedra, corners with eight equivalent O(5)Sr5Mn octahedra, edges with two equivalent O(2)Sr4Mn2 octahedra, faces with two equivalent O(6)Sr3Nd2Mn octahedra, faces with two equivalent O(5)Sr5Mn octahedra, and faces with four equivalent O(9)Sr3NdMn2 octahedra. The corner-sharing octahedral tilt angles range from 2-58°. In the third O site, O(3) is bonded to four equivalent Nd(2) and two equivalent Cu(1) atoms to form distorted ONd4Cu2 octahedra that share corners with two equivalent O(1)Sr2Nd2MnCu octahedra, edges with two equivalent O(3)Nd4Cu2 octahedra, and faces with four equivalent O(8)SrNd3Cu2 octahedra. The corner-sharing octahedral tilt angles are 2°. In the fourth O site, O(4) is bonded in a 6-coordinate geometry to two equivalent Sr(2), one Nd(1), two equivalent Nd(2), and one Cu(1) atom. In the fifth O site, O(5) is bonded to two equivalent Sr(2), three equivalent Sr(1), and one Mn(1) atom to form distorted OSr5Mn octahedra that share corners with two equivalent O(1)Sr2Nd2MnCu octahedra, corners with two equivalent O(8)SrNd3Cu2 octahedra, corners with three equivalent O(6)Sr3Nd2Mn octahedra, corners with four equivalent O(9)Sr3NdMn2 octahedra, corners with four equivalent O(2)Sr4Mn2 octahedra, edges with three equivalent O(6)Sr3Nd2Mn octahedra, edges with four equivalent O(5)Sr5Mn octahedra,  a faceface with one O(1)Sr2Nd2MnCu octahedra,  a faceface with one O(2)Sr4Mn2 octahedra, and faces with two equivalent O(9)Sr3NdMn2 octahedra. The corner-sharing octahedral tilt angles range from 4-57°. In the sixth O site, O(6) is bonded to one Sr(2), two equivalent Sr(1), two equivalent Nd(1), and one Mn(1) atom to form distorted OSr3Nd2Mn octahedra that share corners with two equivalent O(2)Sr4Mn2 octahedra, corners with three equivalent O(9)Sr3NdMn2 octahedra, corners with three equivalent O(5)Sr5Mn octahedra, corners with three equivalent O(8)SrNd3Cu2 octahedra, corners with four equivalent O(1)Sr2Nd2MnCu octahedra, edges with two equivalent O(6)Sr3Nd2Mn octahedra, edges with three equivalent O(5)Sr5Mn octahedra,  a faceface with one O(1)Sr2Nd2MnCu octahedra,  a faceface with one O(2)Sr4Mn2 octahedra, and faces with two equivalent O(9)Sr3NdMn2 octahedra. The corner-sharing octahedral tilt angles range from 4-58°. In the seventh O site, O(7) is bonded in a 6-coordinate geometry to two equivalent Nd(1), three equivalent Nd(2), and one Cu(1) atom. In the eighth O site, O(8) is bonded to one Sr(2), one Nd(1), two equivalent Nd(2), and two equivalent Cu(1) atoms to form distorted OSrNd3Cu2 octahedra that share corners with two equivalent O(5)Sr5Mn octahedra, corners with two equivalent O(8)SrNd3Cu2 octahedra, corners with three equivalent O(6)Sr3Nd2Mn octahedra,  an edgeedge with one O(9)Sr3NdMn2 octahedra,  an edgeedge with one O(8)SrNd3Cu2 octahedra, faces with two equivalent O(3)Nd4Cu2 octahedra, and faces with two equivalent O(1)Sr2Nd2MnCu octahedra. The corner-sharing octahedral tilt angles range from 5-57°. In the ninth O site, O(9) is bonded to one Sr(2), two equivalent Sr(1), one Nd(1), and two equivalent Mn(1) atoms to form distorted OSr3NdMn2 octahedra that share corners with two equivalent O(9)Sr3NdMn2 octahedra, corners with three equivalent O(6)Sr3Nd2Mn octahedra, corners with four equivalent O(5)Sr5Mn octahedra,  an edgeedge with one O(9)Sr3NdMn2 octahedra,  an edgeedge with one O(8)SrNd3Cu2 octahedra, faces with two equivalent O(1)Sr2Nd2MnCu octahedra, faces with two equivalent O(6)Sr3Nd2Mn octahedra, faces with two equivalent O(2)Sr4Mn2 octahedra, and faces with two equivalent O(5)Sr5Mn octahedra. The corner-sharing octahedral tilt angles range from 5-55°.