Mn15(O10Br3)2 crystallizes in the cubic Fm-3m space group. There are three inequivalent Mn sites. In the first Mn site, Mn(1) is bonded in a distorted square co-planar geometry to two equivalent O(1), two equivalent O(2), and two equivalent Br(1) atoms. In the second Mn site, Mn(2) is bonded in an octahedral geometry to six equivalent O(2) atoms. In the third Mn site, Mn(3) is bonded in a body-centered cubic geometry to eight equivalent O(1) atoms. There are two inequivalent O sites. In the first O site, O(1) is bonded to one Mn(3) and three equivalent Mn(1) atoms to form a mixture of distorted corner and edge-sharing OMn4 tetrahedra. In the second O site, O(2) is bonded in a distorted T-shaped geometry to one Mn(2) and two equivalent Mn(1) atoms. Br(1) is bonded in a 4-coordinate geometry to four equivalent Mn(1) atoms.
Mn15(O10Br3)2 crystallizes in the cubic Fm-3m space group. There are three inequivalent Mn sites. In the first Mn site, Mn(1) is bonded in a distorted square co-planar geometry to two equivalent O(1), two equivalent O(2), and two equivalent Br(1) atoms. Both Mn(1)-O(1) bond lengths are 1.91 Å. Both Mn(1)-O(2) bond lengths are 1.89 Å. Both Mn(1)-Br(1) bond lengths are 2.82 Å. In the second Mn site, Mn(2) is bonded in an octahedral geometry to six equivalent O(2) atoms. All Mn(2)-O(2) bond lengths are 1.97 Å. In the third Mn site, Mn(3) is bonded in a body-centered cubic geometry to eight equivalent O(1) atoms. All Mn(3)-O(1) bond lengths are 2.26 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded to one Mn(3) and three equivalent Mn(1) atoms to form a mixture of distorted corner and edge-sharing OMn4 tetrahedra. In the second O site, O(2) is bonded in a distorted T-shaped geometry to one Mn(2) and two equivalent Mn(1) atoms. Br(1) is bonded in a 4-coordinate geometry to four equivalent Mn(1) atoms.