Ba3Mn4PtO12 crystallizes in the monoclinic Pm space group. There are three inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a 9-coordinate geometry to one O(3), two equivalent O(1), two equivalent O(5), two equivalent O(6), and two equivalent O(7) atoms. In the second Ba site, Ba(2) is bonded in a 9-coordinate geometry to one O(4), two equivalent O(2), two equivalent O(5), two equivalent O(6), and two equivalent O(8) atoms. In the third Ba site, Ba(3) is bonded in a 9-coordinate geometry to one O(7), two equivalent O(1), two equivalent O(2), two equivalent O(3), and two equivalent O(5) atoms. There are four inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(4), one O(7), two equivalent O(1), and two equivalent O(6) atoms to form face-sharing MnO6 octahedra. In the second Mn site, Mn(2) is bonded to one O(3), one O(8), two equivalent O(2), and two equivalent O(5) atoms to form face-sharing MnO6 octahedra. In the third Mn site, Mn(3) is bonded to one O(4), one O(7), two equivalent O(1), and two equivalent O(6) atoms to form face-sharing MnO6 octahedra. In the fourth Mn site, Mn(4) is bonded to one O(3), one O(8), two equivalent O(2), and two equivalent O(5) atoms to form face-sharing MnO6 octahedra. Pt(1) is bonded in a trigonal planar geometry to one O(8) and two equivalent O(6) atoms. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Ba(1), one Ba(3), one Mn(1), and one Mn(3) atom. In the second O site, O(2) is bonded in a distorted see-saw-like geometry to one Ba(2), one Ba(3), one Mn(2), and one Mn(4) atom. In the third O site, O(3) is bonded in a 5-coordinate geometry to one Ba(1), two equivalent Ba(3), one Mn(2), and one Mn(4) atom. In the fourth O site, O(4) is bonded in a distorted T-shaped geometry to one Ba(2), one Mn(1), and one Mn(3) atom. In the fifth O site, O(5) is bonded in a 2-coordinate geometry to one Ba(1), one Ba(2), one Ba(3), one Mn(2), and one Mn(4) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one Ba(1), one Ba(2), one Mn(1), one Mn(3), and one Pt(1) atom. In the seventh O site, O(7) is bonded in a 2-coordinate geometry to one Ba(3), two equivalent Ba(1), one Mn(1), and one Mn(3) atom. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to two equivalent Ba(2), one Mn(2), one Mn(4), and one Pt(1) atom.
Ba3Mn4PtO12 crystallizes in the monoclinic Pm space group. There are three inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a 9-coordinate geometry to one O(3), two equivalent O(1), two equivalent O(5), two equivalent O(6), and two equivalent O(7) atoms. The Ba(1)-O(3) bond length is 2.69 Å. Both Ba(1)-O(1) bond lengths are 2.70 Å. Both Ba(1)-O(5) bond lengths are 3.03 Å. Both Ba(1)-O(6) bond lengths are 3.13 Å. Both Ba(1)-O(7) bond lengths are 3.08 Å. In the second Ba site, Ba(2) is bonded in a 9-coordinate geometry to one O(4), two equivalent O(2), two equivalent O(5), two equivalent O(6), and two equivalent O(8) atoms. The Ba(2)-O(4) bond length is 2.65 Å. Both Ba(2)-O(2) bond lengths are 2.67 Å. Both Ba(2)-O(5) bond lengths are 3.05 Å. Both Ba(2)-O(6) bond lengths are 3.13 Å. Both Ba(2)-O(8) bond lengths are 3.10 Å. In the third Ba site, Ba(3) is bonded in a 9-coordinate geometry to one O(7), two equivalent O(1), two equivalent O(2), two equivalent O(3), and two equivalent O(5) atoms. The Ba(3)-O(7) bond length is 2.75 Å. Both Ba(3)-O(1) bond lengths are 2.92 Å. Both Ba(3)-O(2) bond lengths are 2.91 Å. Both Ba(3)-O(3) bond lengths are 3.04 Å. Both Ba(3)-O(5) bond lengths are 2.81 Å. There are four inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(4), one O(7), two equivalent O(1), and two equivalent O(6) atoms to form face-sharing MnO6 octahedra. The Mn(1)-O(4) bond length is 1.89 Å. The Mn(1)-O(7) bond length is 1.95 Å. Both Mn(1)-O(1) bond lengths are 1.95 Å. Both Mn(1)-O(6) bond lengths are 2.00 Å. In the second Mn site, Mn(2) is bonded to one O(3), one O(8), two equivalent O(2), and two equivalent O(5) atoms to form face-sharing MnO6 octahedra. The Mn(2)-O(3) bond length is 1.98 Å. The Mn(2)-O(8) bond length is 2.00 Å. Both Mn(2)-O(2) bond lengths are 1.94 Å. Both Mn(2)-O(5) bond lengths are 1.94 Å. In the third Mn site, Mn(3) is bonded to one O(4), one O(7), two equivalent O(1), and two equivalent O(6) atoms to form face-sharing MnO6 octahedra. The Mn(3)-O(4) bond length is 1.89 Å. The Mn(3)-O(7) bond length is 1.94 Å. Both Mn(3)-O(1) bond lengths are 1.91 Å. Both Mn(3)-O(6) bond lengths are 2.03 Å. In the fourth Mn site, Mn(4) is bonded to one O(3), one O(8), two equivalent O(2), and two equivalent O(5) atoms to form face-sharing MnO6 octahedra. The Mn(4)-O(3) bond length is 1.95 Å. The Mn(4)-O(8) bond length is 2.06 Å. Both Mn(4)-O(2) bond lengths are 1.92 Å. Both Mn(4)-O(5) bond lengths are 1.95 Å. Pt(1) is bonded in a trigonal planar geometry to one O(8) and two equivalent O(6) atoms. The Pt(1)-O(8) bond length is 1.97 Å. Both Pt(1)-O(6) bond lengths are 1.97 Å. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Ba(1), one Ba(3), one Mn(1), and one Mn(3) atom. In the second O site, O(2) is bonded in a distorted see-saw-like geometry to one Ba(2), one Ba(3), one Mn(2), and one Mn(4) atom. In the third O site, O(3) is bonded in a 5-coordinate geometry to one Ba(1), two equivalent Ba(3), one Mn(2), and one Mn(4) atom. In the fourth O site, O(4) is bonded in a distorted T-shaped geometry to one Ba(2), one Mn(1), and one Mn(3) atom. In the fifth O site, O(5) is bonded in a 2-coordinate geometry to one Ba(1), one Ba(2), one Ba(3), one Mn(2), and one Mn(4) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one Ba(1), one Ba(2), one Mn(1), one Mn(3), and one Pt(1) atom. In the seventh O site, O(7) is bonded in a 2-coordinate geometry to one Ba(3), two equivalent Ba(1), one Mn(1), and one Mn(3) atom. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to two equivalent Ba(2), one Mn(2), one Mn(4), and one Pt(1) atom.