KMn8O16 crystallizes in the tetragonal P4/n space group. K(1) is bonded in a body-centered cubic geometry to four equivalent O(3) and four equivalent O(4) atoms. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(1), one O(4), two equivalent O(2), 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 50-51°. In the second Mn site, Mn(2) is bonded to one O(2), one O(3), two equivalent O(1), and two equivalent O(4) atoms to form a mixture of corner and edge-sharing MnO6 octahedra. The corner-sharing octahedral tilt angles range from 50-51°. There are four inequivalent O sites. In the first O site, O(3) 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(4) 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(1) is bonded in a distorted trigonal planar geometry to one Mn(1) and two equivalent Mn(2) atoms. In the fourth O site, O(2) is bonded in a trigonal planar geometry to one Mn(2) and two equivalent Mn(1) atoms.
KMn8O16 crystallizes in the tetragonal P4/n space group. K(1) is bonded in a body-centered cubic geometry to four equivalent O(3) and four equivalent O(4) atoms. All K(1)-O(3) bond lengths are 2.95 Å. All K(1)-O(4) bond lengths are 2.94 Å. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(1), one O(4), two equivalent O(2), 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 50-51°. The Mn(1)-O(1) bond length is 1.93 Å. The Mn(1)-O(4) bond length is 1.98 Å. There is one shorter (1.92 Å) and one longer (1.93 Å) Mn(1)-O(2) bond length. There is one shorter (1.97 Å) and one longer (1.98 Å) Mn(1)-O(3) bond length. In the second Mn site, Mn(2) is bonded to one O(2), one O(3), two equivalent O(1), and two equivalent O(4) atoms to form a mixture of corner and edge-sharing MnO6 octahedra. The corner-sharing octahedral tilt angles range from 50-51°. The Mn(2)-O(2) bond length is 1.92 Å. The Mn(2)-O(3) bond length is 1.96 Å. Both Mn(2)-O(1) bond lengths are 1.93 Å. There is one shorter (1.96 Å) and one longer (1.99 Å) Mn(2)-O(4) bond length. There are four inequivalent O sites. In the first O site, O(3) 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(4) 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(1) is bonded in a distorted trigonal planar geometry to one Mn(1) and two equivalent Mn(2) atoms. In the fourth O site, O(2) is bonded in a trigonal planar geometry to one Mn(2) and two equivalent Mn(1) atoms.