La4Mn4O11 crystallizes in the monoclinic Pc space group. There are four inequivalent La sites. In the first La site, La(1) is bonded in a 7-coordinate geometry to one O(1), one O(11), one O(2), one O(3), one O(7), one O(8), and one O(9) atom. In the second La site, La(2) is bonded in a 8-coordinate geometry to one O(1), one O(2), one O(3), one O(5), one O(6), one O(7), one O(8), and one O(9) atom. In the third La site, La(3) is bonded in a 7-coordinate geometry to one O(10), one O(11), one O(4), one O(5), one O(6), one O(7), and one O(8) atom. In the fourth La site, La(4) is bonded in a 7-coordinate geometry to one O(1), one O(10), one O(11), one O(2), one O(4), one O(5), and one O(6) atom. There are four inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(1), one O(3), one O(4), one O(5), and one O(7) atom to form MnO5 square pyramids that share corners with two equivalent Mn(2)O6 octahedra, corners with two equivalent Mn(4)O6 octahedra, and  a cornercorner with one Mn(3)O5 square pyramid. The corner-sharing octahedral tilt angles range from 25-36°. In the second Mn site, Mn(2) is bonded to one O(11), one O(2), one O(3), one O(4), one O(6), and one O(8) atom to form MnO6 octahedra that share corners with two equivalent Mn(4)O6 octahedra, corners with two equivalent Mn(1)O5 square pyramids, and corners with two equivalent Mn(3)O5 square pyramids. The corner-sharing octahedral tilt angles range from 29-32°. In the third Mn site, Mn(3) is bonded to one O(10), one O(2), one O(6), one O(7), and one O(9) atom to form MnO5 square pyramids that share corners with two equivalent Mn(2)O6 octahedra, corners with two equivalent Mn(4)O6 octahedra, and  a cornercorner with one Mn(1)O5 square pyramid. The corner-sharing octahedral tilt angles range from 28-33°. In the fourth Mn site, Mn(4) is bonded to one O(1), one O(10), one O(11), one O(5), one O(8), and one O(9) atom to form MnO6 octahedra that share corners with two equivalent Mn(2)O6 octahedra, corners with two equivalent Mn(1)O5 square pyramids, and corners with two equivalent Mn(3)O5 square pyramids. The corner-sharing octahedral tilt angles range from 29-32°. There are eleven inequivalent O sites. In the first O site, O(1) is bonded in a 5-coordinate geometry to one La(1), one La(2), one La(4), one Mn(1), and one Mn(4) atom. In the second O site, O(2) is bonded in a 5-coordinate geometry to one La(1), one La(2), one La(4), one Mn(2), and one Mn(3) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to one La(1), one La(2), one Mn(1), and one Mn(2) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one La(3), one La(4), one Mn(1), and one Mn(2) atom. In the fifth O site, O(5) is bonded in a 5-coordinate geometry to one La(2), one La(3), one La(4), one Mn(1), and one Mn(4) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one La(2), one La(3), one La(4), one Mn(2), and one Mn(3) atom. In the seventh O site, O(7) is bonded in a 5-coordinate geometry to one La(1), one La(2), one La(3), one Mn(1), and one Mn(3) atom. In the eighth O site, O(8) is bonded in a 5-coordinate geometry to one La(1), one La(2), one La(3), one Mn(2), and one Mn(4) atom. In the ninth O site, O(9) is bonded in a distorted tetrahedral geometry to one La(1), one La(2), one Mn(3), and one Mn(4) atom. In the tenth O site, O(10) is bonded in a 4-coordinate geometry to one La(3), one La(4), one Mn(3), and one Mn(4) atom. In the eleventh O site, O(11) is bonded in a 5-coordinate geometry to one La(1), one La(3), one La(4), one Mn(2), and one Mn(4) atom.
La4Mn4O11 crystallizes in the monoclinic Pc space group. There are four inequivalent La sites. In the first La site, La(1) is bonded in a 7-coordinate geometry to one O(1), one O(11), one O(2), one O(3), one O(7), one O(8), and one O(9) atom. The La(1)-O(1) bond length is 2.60 Å. The La(1)-O(11) bond length is 2.85 Å. The La(1)-O(2) bond length is 2.69 Å. The La(1)-O(3) bond length is 2.50 Å. The La(1)-O(7) bond length is 2.34 Å. The La(1)-O(8) bond length is 2.48 Å. The La(1)-O(9) bond length is 2.41 Å. In the second La site, La(2) is bonded in a 8-coordinate geometry to one O(1), one O(2), one O(3), one O(5), one O(6), one O(7), one O(8), and one O(9) atom. The La(2)-O(1) bond length is 2.52 Å. The La(2)-O(2) bond length is 2.35 Å. The La(2)-O(3) bond length is 2.39 Å. The La(2)-O(5) bond length is 2.68 Å. The La(2)-O(6) bond length is 3.06 Å. The La(2)-O(7) bond length is 2.87 Å. The La(2)-O(8) bond length is 2.63 Å. The La(2)-O(9) bond length is 2.51 Å. In the third La site, La(3) is bonded in a 7-coordinate geometry to one O(10), one O(11), one O(4), one O(5), one O(6), one O(7), and one O(8) atom. The La(3)-O(10) bond length is 2.43 Å. The La(3)-O(11) bond length is 2.43 Å. The La(3)-O(4) bond length is 2.50 Å. The La(3)-O(5) bond length is 2.67 Å. The La(3)-O(6) bond length is 2.52 Å. The La(3)-O(7) bond length is 2.56 Å. The La(3)-O(8) bond length is 2.91 Å. In the fourth La site, La(4) is bonded in a 7-coordinate geometry to one O(1), one O(10), one O(11), one O(2), one O(4), one O(5), and one O(6) atom. The La(4)-O(1) bond length is 2.77 Å. The La(4)-O(10) bond length is 2.50 Å. The La(4)-O(11) bond length is 2.75 Å. The La(4)-O(2) bond length is 2.80 Å. The La(4)-O(4) bond length is 2.36 Å. The La(4)-O(5) bond length is 2.41 Å. The La(4)-O(6) bond length is 2.46 Å. There are four inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(1), one O(3), one O(4), one O(5), and one O(7) atom to form MnO5 square pyramids that share corners with two equivalent Mn(2)O6 octahedra, corners with two equivalent Mn(4)O6 octahedra, and  a cornercorner with one Mn(3)O5 square pyramid. The corner-sharing octahedral tilt angles range from 25-36°. The Mn(1)-O(1) bond length is 1.96 Å. The Mn(1)-O(3) bond length is 1.95 Å. The Mn(1)-O(4) bond length is 1.97 Å. The Mn(1)-O(5) bond length is 1.98 Å. The Mn(1)-O(7) bond length is 2.07 Å. In the second Mn site, Mn(2) is bonded to one O(11), one O(2), one O(3), one O(4), one O(6), and one O(8) atom to form MnO6 octahedra that share corners with two equivalent Mn(4)O6 octahedra, corners with two equivalent Mn(1)O5 square pyramids, and corners with two equivalent Mn(3)O5 square pyramids. The corner-sharing octahedral tilt angles range from 29-32°. The Mn(2)-O(11) bond length is 2.14 Å. The Mn(2)-O(2) bond length is 2.17 Å. The Mn(2)-O(3) bond length is 2.20 Å. The Mn(2)-O(4) bond length is 2.18 Å. The Mn(2)-O(6) bond length is 2.15 Å. The Mn(2)-O(8) bond length is 2.14 Å. In the third Mn site, Mn(3) is bonded to one O(10), one O(2), one O(6), one O(7), and one O(9) atom to form MnO5 square pyramids that share corners with two equivalent Mn(2)O6 octahedra, corners with two equivalent Mn(4)O6 octahedra, and  a cornercorner with one Mn(1)O5 square pyramid. The corner-sharing octahedral tilt angles range from 28-33°. The Mn(3)-O(10) bond length is 2.10 Å. The Mn(3)-O(2) bond length is 2.09 Å. The Mn(3)-O(6) bond length is 2.08 Å. The Mn(3)-O(7) bond length is 2.06 Å. The Mn(3)-O(9) bond length is 2.11 Å. In the fourth Mn site, Mn(4) is bonded to one O(1), one O(10), one O(11), one O(5), one O(8), and one O(9) atom to form MnO6 octahedra that share corners with two equivalent Mn(2)O6 octahedra, corners with two equivalent Mn(1)O5 square pyramids, and corners with two equivalent Mn(3)O5 square pyramids. The corner-sharing octahedral tilt angles range from 29-32°. The Mn(4)-O(1) bond length is 2.25 Å. The Mn(4)-O(10) bond length is 2.04 Å. The Mn(4)-O(11) bond length is 1.99 Å. The Mn(4)-O(5) bond length is 2.33 Å. The Mn(4)-O(8) bond length is 1.99 Å. The Mn(4)-O(9) bond length is 2.05 Å. There are eleven inequivalent O sites. In the first O site, O(1) is bonded in a 5-coordinate geometry to one La(1), one La(2), one La(4), one Mn(1), and one Mn(4) atom. In the second O site, O(2) is bonded in a 5-coordinate geometry to one La(1), one La(2), one La(4), one Mn(2), and one Mn(3) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to one La(1), one La(2), one Mn(1), and one Mn(2) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one La(3), one La(4), one Mn(1), and one Mn(2) atom. In the fifth O site, O(5) is bonded in a 5-coordinate geometry to one La(2), one La(3), one La(4), one Mn(1), and one Mn(4) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one La(2), one La(3), one La(4), one Mn(2), and one Mn(3) atom. In the seventh O site, O(7) is bonded in a 5-coordinate geometry to one La(1), one La(2), one La(3), one Mn(1), and one Mn(3) atom. In the eighth O site, O(8) is bonded in a 5-coordinate geometry to one La(1), one La(2), one La(3), one Mn(2), and one Mn(4) atom. In the ninth O site, O(9) is bonded in a distorted tetrahedral geometry to one La(1), one La(2), one Mn(3), and one Mn(4) atom. In the tenth O site, O(10) is bonded in a 4-coordinate geometry to one La(3), one La(4), one Mn(3), and one Mn(4) atom. In the eleventh O site, O(11) is bonded in a 5-coordinate geometry to one La(1), one La(3), one La(4), one Mn(2), and one Mn(4) atom.