Sr2MgLa2MnO8 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(1), two equivalent O(5), two equivalent O(8), and three equivalent O(4) atoms. In the second Sr site, Sr(2) is bonded in a 9-coordinate geometry to one O(5), one O(8), one O(9), two equivalent O(2), two equivalent O(4), and two equivalent O(7) atoms. Mg(1) is bonded to one O(2), one O(3), one O(6), one O(7), and two equivalent O(9) atoms to form MgO6 octahedra that share  a cornercorner with one Mn(1)O6 octahedra and corners with three equivalent Mg(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-6°. There are two inequivalent La sites. In the first La site, La(1) is bonded in a 9-coordinate geometry to two equivalent O(3), two equivalent O(7), two equivalent O(9), and three equivalent O(6) atoms. In the second La site, La(2) is bonded in a 9-coordinate geometry to one O(7), one O(8), one O(9), two equivalent O(2), two equivalent O(5), and two equivalent O(6) atoms. Mn(1) is bonded to one O(1), one O(2), one O(4), one O(5), and two equivalent O(8) atoms to form MnO6 octahedra that share  a cornercorner with one Mg(1)O6 octahedra and corners with three equivalent Mn(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 four equivalent Sr(1) and two equivalent Mn(1) atoms to form distorted OSr4Mn2 octahedra that share corners with two equivalent O(2)Sr2La2MgMn octahedra, corners with four equivalent O(5)Sr3La2Mn octahedra, corners with eight equivalent O(4)Sr5Mn octahedra, edges with two equivalent O(1)Sr4Mn2 octahedra, faces with two equivalent O(5)Sr3La2Mn octahedra, faces with two equivalent O(4)Sr5Mn octahedra, and faces with four equivalent O(8)Sr3LaMn2 octahedra. The corner-sharing octahedral tilt angles range from 2-56°. In the second O site, O(2) is bonded to two equivalent Sr(2), one Mg(1), two equivalent La(2), and one Mn(1) atom to form distorted OSr2La2MgMn octahedra that share  a cornercorner with one O(3)La4Mg2 octahedra,  a cornercorner with one O(1)Sr4Mn2 octahedra, corners with two equivalent O(4)Sr5Mn octahedra, corners with four equivalent O(7)Sr2La3Mg octahedra, corners with four equivalent O(5)Sr3La2Mn octahedra, edges with two equivalent O(2)Sr2La2MgMn octahedra,  a faceface with one O(7)Sr2La3Mg octahedra,  a faceface with one O(5)Sr3La2Mn octahedra,  a faceface with one O(4)Sr5Mn octahedra, faces with two equivalent O(8)Sr3LaMn2 octahedra, and faces with two equivalent O(9)SrLa3Mg2 octahedra. The corner-sharing octahedral tilt angles range from 2-58°. In the third O site, O(3) is bonded to two equivalent Mg(1) and four equivalent La(1) atoms to form distorted OLa4Mg2 octahedra that share corners with two equivalent O(2)Sr2La2MgMn octahedra, corners with four equivalent O(7)Sr2La3Mg octahedra, edges with two equivalent O(3)La4Mg2 octahedra, faces with two equivalent O(7)Sr2La3Mg octahedra, and faces with four equivalent O(9)SrLa3Mg2 octahedra. The corner-sharing octahedral tilt angles range from 3-48°. In the fourth O site, O(4) 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(2)Sr2La2MgMn octahedra, corners with two equivalent O(7)Sr2La3Mg octahedra, corners with two equivalent O(9)SrLa3Mg2 octahedra, corners with three equivalent O(5)Sr3La2Mn octahedra, corners with four equivalent O(8)Sr3LaMn2 octahedra, corners with four equivalent O(1)Sr4Mn2 octahedra,  an edgeedge with one O(7)Sr2La3Mg octahedra, edges with three equivalent O(5)Sr3La2Mn octahedra, edges with four equivalent O(4)Sr5Mn octahedra,  a faceface with one O(2)Sr2La2MgMn octahedra,  a faceface with one O(1)Sr4Mn2 octahedra, and faces with two equivalent O(8)Sr3LaMn2 octahedra. The corner-sharing octahedral tilt angles range from 2-58°. In the fifth O site, O(5) is bonded to one Sr(2), two equivalent Sr(1), two equivalent La(2), and one Mn(1) atom to form distorted OSr3La2Mn octahedra that share corners with two equivalent O(1)Sr4Mn2 octahedra, corners with three equivalent O(8)Sr3LaMn2 octahedra, corners with three equivalent O(4)Sr5Mn octahedra, corners with three equivalent O(9)SrLa3Mg2 octahedra, corners with four equivalent O(2)Sr2La2MgMn octahedra, edges with two equivalent O(7)Sr2La3Mg octahedra, edges with two equivalent O(5)Sr3La2Mn octahedra, edges with three equivalent O(4)Sr5Mn octahedra,  a faceface with one O(2)Sr2La2MgMn octahedra,  a faceface with one O(1)Sr4Mn2 octahedra, and faces with two equivalent O(8)Sr3LaMn2 octahedra. The corner-sharing octahedral tilt angles range from 2-56°. In the sixth O site, O(6) is bonded in a 6-coordinate geometry to one Mg(1), two equivalent La(2), and three equivalent La(1) atoms. In the seventh O site, O(7) is bonded to two equivalent Sr(2), one Mg(1), one La(2), and two equivalent La(1) atoms to form distorted OSr2La3Mg octahedra that share corners with two equivalent O(3)La4Mg2 octahedra, corners with two equivalent O(4)Sr5Mn octahedra, corners with three equivalent O(8)Sr3LaMn2 octahedra, corners with three equivalent O(9)SrLa3Mg2 octahedra, corners with four equivalent O(2)Sr2La2MgMn octahedra,  an edgeedge with one O(4)Sr5Mn octahedra, edges with two equivalent O(7)Sr2La3Mg octahedra, edges with two equivalent O(5)Sr3La2Mn octahedra,  a faceface with one O(3)La4Mg2 octahedra,  a faceface with one O(2)Sr2La2MgMn octahedra, and faces with two equivalent O(9)SrLa3Mg2 octahedra. The corner-sharing octahedral tilt angles range from 12-52°. In the eighth O site, O(8) is bonded to one Sr(2), two equivalent Sr(1), one La(2), and two equivalent Mn(1) atoms to form distorted OSr3LaMn2 octahedra that share corners with two equivalent O(8)Sr3LaMn2 octahedra, corners with three equivalent O(7)Sr2La3Mg octahedra, corners with three equivalent O(5)Sr3La2Mn octahedra, corners with four equivalent O(4)Sr5Mn octahedra,  an edgeedge with one O(8)Sr3LaMn2 octahedra,  an edgeedge with one O(9)SrLa3Mg2 octahedra, faces with two equivalent O(2)Sr2La2MgMn octahedra, faces with two equivalent O(5)Sr3La2Mn octahedra, faces with two equivalent O(1)Sr4Mn2 octahedra, and faces with two equivalent O(4)Sr5Mn octahedra. The corner-sharing octahedral tilt angles range from 5-56°. In the ninth O site, O(9) is bonded to one Sr(2), two equivalent Mg(1), one La(2), and two equivalent La(1) atoms to form distorted OSrLa3Mg2 octahedra that share corners with two equivalent O(4)Sr5Mn octahedra, corners with two equivalent O(9)SrLa3Mg2 octahedra, corners with three equivalent O(7)Sr2La3Mg octahedra, corners with three equivalent O(5)Sr3La2Mn octahedra,  an edgeedge with one O(8)Sr3LaMn2 octahedra,  an edgeedge with one O(9)SrLa3Mg2 octahedra, faces with two equivalent O(3)La4Mg2 octahedra, faces with two equivalent O(2)Sr2La2MgMn octahedra, and faces with two equivalent O(7)Sr2La3Mg octahedra. The corner-sharing octahedral tilt angles range from 6-57°.
Sr2MgLa2MnO8 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(1), two equivalent O(5), two equivalent O(8), and three equivalent O(4) atoms. There is one shorter (2.64 Å) and one longer (2.65 Å) Sr(1)-O(1) bond length. There is one shorter (2.79 Å) and one longer (2.80 Å) Sr(1)-O(5) bond length. There is one shorter (2.61 Å) and one longer (2.68 Å) Sr(1)-O(8) bond length. There are a spread of Sr(1)-O(4) bond distances ranging from 2.53-2.76 Å. In the second Sr site, Sr(2) is bonded in a 9-coordinate geometry to one O(5), one O(8), one O(9), two equivalent O(2), two equivalent O(4), and two equivalent O(7) atoms. The Sr(2)-O(5) bond length is 2.49 Å. The Sr(2)-O(8) bond length is 2.71 Å. The Sr(2)-O(9) bond length is 2.66 Å. There is one shorter (2.67 Å) and one longer (2.68 Å) Sr(2)-O(2) bond length. Both Sr(2)-O(4) bond lengths are 2.76 Å. There is one shorter (2.85 Å) and one longer (2.87 Å) Sr(2)-O(7) bond length. Mg(1) is bonded to one O(2), one O(3), one O(6), one O(7), and two equivalent O(9) atoms to form MgO6 octahedra that share  a cornercorner with one Mn(1)O6 octahedra and corners with three equivalent Mg(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-6°. The Mg(1)-O(2) bond length is 2.02 Å. The Mg(1)-O(3) bond length is 1.97 Å. The Mg(1)-O(6) bond length is 2.28 Å. The Mg(1)-O(7) bond length is 2.19 Å. Both Mg(1)-O(9) bond lengths are 1.95 Å. There are two inequivalent La sites. In the first La site, La(1) is bonded in a 9-coordinate geometry to two equivalent O(3), two equivalent O(7), two equivalent O(9), and three equivalent O(6) atoms. There is one shorter (2.58 Å) and one longer (2.62 Å) La(1)-O(3) bond length. There is one shorter (2.66 Å) and one longer (2.72 Å) La(1)-O(7) bond length. There is one shorter (2.62 Å) and one longer (2.65 Å) La(1)-O(9) bond length. There are a spread of La(1)-O(6) bond distances ranging from 2.32-2.93 Å. In the second La site, La(2) is bonded in a 9-coordinate geometry to one O(7), one O(8), one O(9), two equivalent O(2), two equivalent O(5), and two equivalent O(6) atoms. The La(2)-O(7) bond length is 2.33 Å. The La(2)-O(8) bond length is 2.60 Å. The La(2)-O(9) bond length is 2.51 Å. There is one shorter (2.59 Å) and one longer (2.60 Å) La(2)-O(2) bond length. There is one shorter (2.75 Å) and one longer (2.76 Å) La(2)-O(5) bond length. There is one shorter (2.70 Å) and one longer (2.74 Å) La(2)-O(6) bond length. Mn(1) is bonded to one O(1), one O(2), one O(4), one O(5), and two equivalent O(8) atoms to form MnO6 octahedra that share  a cornercorner with one Mg(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 1.87 Å. The Mn(1)-O(4) bond length is 1.95 Å. The Mn(1)-O(5) bond length is 2.01 Å. There is one shorter (1.94 Å) and one longer (1.95 Å) Mn(1)-O(8) bond length. There are nine inequivalent O sites. In the first O site, O(1) 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(2)Sr2La2MgMn octahedra, corners with four equivalent O(5)Sr3La2Mn octahedra, corners with eight equivalent O(4)Sr5Mn octahedra, edges with two equivalent O(1)Sr4Mn2 octahedra, faces with two equivalent O(5)Sr3La2Mn octahedra, faces with two equivalent O(4)Sr5Mn octahedra, and faces with four equivalent O(8)Sr3LaMn2 octahedra. The corner-sharing octahedral tilt angles range from 2-56°. In the second O site, O(2) is bonded to two equivalent Sr(2), one Mg(1), two equivalent La(2), and one Mn(1) atom to form distorted OSr2La2MgMn octahedra that share  a cornercorner with one O(3)La4Mg2 octahedra,  a cornercorner with one O(1)Sr4Mn2 octahedra, corners with two equivalent O(4)Sr5Mn octahedra, corners with four equivalent O(7)Sr2La3Mg octahedra, corners with four equivalent O(5)Sr3La2Mn octahedra, edges with two equivalent O(2)Sr2La2MgMn octahedra,  a faceface with one O(7)Sr2La3Mg octahedra,  a faceface with one O(5)Sr3La2Mn octahedra,  a faceface with one O(4)Sr5Mn octahedra, faces with two equivalent O(8)Sr3LaMn2 octahedra, and faces with two equivalent O(9)SrLa3Mg2 octahedra. The corner-sharing octahedral tilt angles range from 2-58°. In the third O site, O(3) is bonded to two equivalent Mg(1) and four equivalent La(1) atoms to form distorted OLa4Mg2 octahedra that share corners with two equivalent O(2)Sr2La2MgMn octahedra, corners with four equivalent O(7)Sr2La3Mg octahedra, edges with two equivalent O(3)La4Mg2 octahedra, faces with two equivalent O(7)Sr2La3Mg octahedra, and faces with four equivalent O(9)SrLa3Mg2 octahedra. The corner-sharing octahedral tilt angles range from 3-48°. In the fourth O site, O(4) 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(2)Sr2La2MgMn octahedra, corners with two equivalent O(7)Sr2La3Mg octahedra, corners with two equivalent O(9)SrLa3Mg2 octahedra, corners with three equivalent O(5)Sr3La2Mn octahedra, corners with four equivalent O(8)Sr3LaMn2 octahedra, corners with four equivalent O(1)Sr4Mn2 octahedra,  an edgeedge with one O(7)Sr2La3Mg octahedra, edges with three equivalent O(5)Sr3La2Mn octahedra, edges with four equivalent O(4)Sr5Mn octahedra,  a faceface with one O(2)Sr2La2MgMn octahedra,  a faceface with one O(1)Sr4Mn2 octahedra, and faces with two equivalent O(8)Sr3LaMn2 octahedra. The corner-sharing octahedral tilt angles range from 2-58°. In the fifth O site, O(5) is bonded to one Sr(2), two equivalent Sr(1), two equivalent La(2), and one Mn(1) atom to form distorted OSr3La2Mn octahedra that share corners with two equivalent O(1)Sr4Mn2 octahedra, corners with three equivalent O(8)Sr3LaMn2 octahedra, corners with three equivalent O(4)Sr5Mn octahedra, corners with three equivalent O(9)SrLa3Mg2 octahedra, corners with four equivalent O(2)Sr2La2MgMn octahedra, edges with two equivalent O(7)Sr2La3Mg octahedra, edges with two equivalent O(5)Sr3La2Mn octahedra, edges with three equivalent O(4)Sr5Mn octahedra,  a faceface with one O(2)Sr2La2MgMn octahedra,  a faceface with one O(1)Sr4Mn2 octahedra, and faces with two equivalent O(8)Sr3LaMn2 octahedra. The corner-sharing octahedral tilt angles range from 2-56°. In the sixth O site, O(6) is bonded in a 6-coordinate geometry to one Mg(1), two equivalent La(2), and three equivalent La(1) atoms. In the seventh O site, O(7) is bonded to two equivalent Sr(2), one Mg(1), one La(2), and two equivalent La(1) atoms to form distorted OSr2La3Mg octahedra that share corners with two equivalent O(3)La4Mg2 octahedra, corners with two equivalent O(4)Sr5Mn octahedra, corners with three equivalent O(8)Sr3LaMn2 octahedra, corners with three equivalent O(9)SrLa3Mg2 octahedra, corners with four equivalent O(2)Sr2La2MgMn octahedra,  an edgeedge with one O(4)Sr5Mn octahedra, edges with two equivalent O(7)Sr2La3Mg octahedra, edges with two equivalent O(5)Sr3La2Mn octahedra,  a faceface with one O(3)La4Mg2 octahedra,  a faceface with one O(2)Sr2La2MgMn octahedra, and faces with two equivalent O(9)SrLa3Mg2 octahedra. The corner-sharing octahedral tilt angles range from 12-52°. In the eighth O site, O(8) is bonded to one Sr(2), two equivalent Sr(1), one La(2), and two equivalent Mn(1) atoms to form distorted OSr3LaMn2 octahedra that share corners with two equivalent O(8)Sr3LaMn2 octahedra, corners with three equivalent O(7)Sr2La3Mg octahedra, corners with three equivalent O(5)Sr3La2Mn octahedra, corners with four equivalent O(4)Sr5Mn octahedra,  an edgeedge with one O(8)Sr3LaMn2 octahedra,  an edgeedge with one O(9)SrLa3Mg2 octahedra, faces with two equivalent O(2)Sr2La2MgMn octahedra, faces with two equivalent O(5)Sr3La2Mn octahedra, faces with two equivalent O(1)Sr4Mn2 octahedra, and faces with two equivalent O(4)Sr5Mn octahedra. The corner-sharing octahedral tilt angles range from 5-56°. In the ninth O site, O(9) is bonded to one Sr(2), two equivalent Mg(1), one La(2), and two equivalent La(1) atoms to form distorted OSrLa3Mg2 octahedra that share corners with two equivalent O(4)Sr5Mn octahedra, corners with two equivalent O(9)SrLa3Mg2 octahedra, corners with three equivalent O(7)Sr2La3Mg octahedra, corners with three equivalent O(5)Sr3La2Mn octahedra,  an edgeedge with one O(8)Sr3LaMn2 octahedra,  an edgeedge with one O(9)SrLa3Mg2 octahedra, faces with two equivalent O(3)La4Mg2 octahedra, faces with two equivalent O(2)Sr2La2MgMn octahedra, and faces with two equivalent O(7)Sr2La3Mg octahedra. The corner-sharing octahedral tilt angles range from 6-57°.