RbMg(O2Br)3 crystallizes in the monoclinic C2/c space group. Rb(1) is bonded in a 4-coordinate geometry to two equivalent O(2) and two equivalent O(3) atoms. Mg(1) is bonded in an octahedral geometry to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms. There are three inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Mg(1), one Br(1), and one Br(2) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Rb(1), one Mg(1), and one Br(2) atom. In the third O site, O(3) is bonded in a distorted trigonal non-coplanar geometry to one Rb(1), one Mg(1), and one Br(2) atom. There are two inequivalent Br sites. In the first Br site, Br(1) is bonded in a linear geometry to two equivalent O(1) atoms. In the second Br site, Br(2) is bonded in a distorted T-shaped geometry to one O(1), one O(2), and one O(3) atom.
RbMg(O2Br)3 crystallizes in the monoclinic C2/c space group. Rb(1) is bonded in a 4-coordinate geometry to two equivalent O(2) and two equivalent O(3) atoms. Both Rb(1)-O(2) bond lengths are 3.23 Å. Both Rb(1)-O(3) bond lengths are 2.82 Å. Mg(1) is bonded in an octahedral geometry to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms. Both Mg(1)-O(1) bond lengths are 2.10 Å. Both Mg(1)-O(2) bond lengths are 2.13 Å. Both Mg(1)-O(3) bond lengths are 2.15 Å. There are three inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Mg(1), one Br(1), and one Br(2) atom. The O(1)-Br(1) bond length is 1.97 Å. The O(1)-Br(2) bond length is 2.30 Å. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Rb(1), one Mg(1), and one Br(2) atom. The O(2)-Br(2) bond length is 1.78 Å. In the third O site, O(3) is bonded in a distorted trigonal non-coplanar geometry to one Rb(1), one Mg(1), and one Br(2) atom. The O(3)-Br(2) bond length is 1.75 Å. There are two inequivalent Br sites. In the first Br site, Br(1) is bonded in a linear geometry to two equivalent O(1) atoms. In the second Br site, Br(2) is bonded in a distorted T-shaped geometry to one O(1), one O(2), and one O(3) atom.