KMn8O16 crystallizes in the triclinic P-1 space group. K(1) is bonded in a distorted body-centered cubic geometry to two equivalent O(1), two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms. There are four inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(2); one O(5,8); one O(6); one O(7); and two equivalent O(1) atoms to form a mixture of corner and edge-sharing MnO6 octahedra. The corner-sharing octahedral tilt angles range from 49-50°. In the second Mn site, Mn(2) is bonded to one O(1); one O(7); two equivalent O(2); and two equivalent O(5,8) atoms to form a mixture of corner and edge-sharing MnO6 octahedra. The corner-sharing octahedral tilt angles range from 49-50°. In the third Mn site, Mn(3) is bonded to one O(3); one O(6); two equivalent O(4); and two equivalent O(5,8) atoms to form a mixture of corner and edge-sharing MnO6 octahedra. The corner-sharing octahedral tilt angles range from 49-50°. In the fourth Mn site, Mn(4) is bonded to one O(4); one O(5,8); one O(6); one O(7); and two equivalent O(3) atoms to form a mixture of corner and edge-sharing MnO6 octahedra. The corner-sharing octahedral tilt angles range from 49-50°. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one K(1), one Mn(2), and two equivalent Mn(1) atoms. In the second O site, O(2) is bonded in a 3-coordinate geometry to one K(1), one Mn(1), and two equivalent Mn(2) atoms. In the third O site, O(3) is bonded in a 3-coordinate geometry to one K(1), one Mn(3), and two equivalent Mn(4) atoms. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one K(1), one Mn(4), and two equivalent Mn(3) atoms. In the fifth O site, O(5,8) is bonded in a distorted trigonal planar geometry to one Mn(2), one Mn(3), and one Mn(4) atom. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to one Mn(1), one Mn(3), and one Mn(4) atom. In the seventh O site, O(7) is bonded in a distorted trigonal planar geometry to one Mn(1), one Mn(2), and one Mn(4) atom.
KMn8O16 crystallizes in the triclinic P-1 space group. K(1) is bonded in a distorted body-centered cubic geometry to two equivalent O(1), two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms. Both K(1)-O(1) bond lengths are 2.88 Å. Both K(1)-O(2) bond lengths are 2.88 Å. Both K(1)-O(3) bond lengths are 2.88 Å. Both K(1)-O(4) bond lengths are 2.87 Å. There are four inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(2); one O(5,8); one O(6); one O(7); and two equivalent O(1) atoms to form a mixture of corner and edge-sharing MnO6 octahedra. The corner-sharing octahedral tilt angles range from 49-50°. The Mn(1)-O(2) bond length is 1.92 Å. The Mn(1)-O(5,8) bond length is 1.89 Å. The Mn(1)-O(6) bond length is 1.89 Å. The Mn(1)-O(7) bond length is 1.89 Å. There is one shorter (1.92 Å) and one longer (1.94 Å) Mn(1)-O(1) bond length. In the second Mn site, Mn(2) is bonded to one O(1); one O(7); two equivalent O(2); and two equivalent O(5,8) atoms to form a mixture of corner and edge-sharing MnO6 octahedra. The corner-sharing octahedral tilt angles range from 49-50°. The Mn(2)-O(1) bond length is 1.91 Å. The Mn(2)-O(7) bond length is 1.88 Å. There is one shorter (1.92 Å) and one longer (1.93 Å) Mn(2)-O(2) bond length. There is one shorter (1.89 Å) and one longer (1.90 Å) Mn(2)-O(5,8) bond length. In the third Mn site, Mn(3) is bonded to one O(3); one O(6); two equivalent O(4); and two equivalent O(5,8) atoms to form a mixture of corner and edge-sharing MnO6 octahedra. The corner-sharing octahedral tilt angles range from 49-50°. The Mn(3)-O(3) bond length is 1.91 Å. The Mn(3)-O(6) bond length is 1.88 Å. There is one shorter (1.92 Å) and one longer (1.93 Å) Mn(3)-O(4) bond length. There is one shorter (1.89 Å) and one longer (1.90 Å) Mn(3)-O(5,8) bond length. In the fourth Mn site, Mn(4) is bonded to one O(4); one O(5,8); one O(6); one O(7); and two equivalent O(3) atoms to form a mixture of corner and edge-sharing MnO6 octahedra. The corner-sharing octahedral tilt angles range from 49-50°. The Mn(4)-O(4) bond length is 1.92 Å. The Mn(4)-O(5,8) bond length is 1.89 Å. The Mn(4)-O(6) bond length is 1.89 Å. The Mn(4)-O(7) bond length is 1.89 Å. There is one shorter (1.92 Å) and one longer (1.94 Å) Mn(4)-O(3) bond length. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one K(1), one Mn(2), and two equivalent Mn(1) atoms. In the second O site, O(2) is bonded in a 3-coordinate geometry to one K(1), one Mn(1), and two equivalent Mn(2) atoms. In the third O site, O(3) is bonded in a 3-coordinate geometry to one K(1), one Mn(3), and two equivalent Mn(4) atoms. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one K(1), one Mn(4), and two equivalent Mn(3) atoms. In the fifth O site, O(5,8) is bonded in a distorted trigonal planar geometry to one Mn(2), one Mn(3), and one Mn(4) atom. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to one Mn(1), one Mn(3), and one Mn(4) atom. In the seventh O site, O(7) is bonded in a distorted trigonal planar geometry to one Mn(1), one Mn(2), and one Mn(4) atom.