MgCu2(RhO2)4 crystallizes in the orthorhombic Imm2 space group. Mg(1) is bonded in a distorted body-centered cubic geometry to two equivalent Rh(1), two equivalent Rh(2), two equivalent O(3), and two equivalent O(4) atoms. There are two inequivalent Rh sites. In the first Rh site, Rh(1) is bonded in a 7-coordinate geometry to one Mg(1), one O(1), one O(4), two equivalent O(2), and two equivalent O(3) atoms. In the second Rh site, Rh(2) is bonded in a 7-coordinate geometry to one Mg(1), one O(2), one O(3), two equivalent O(1), and two equivalent O(4) atoms. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a tetrahedral geometry to two equivalent O(3) and two equivalent O(4) atoms. In the second Cu site, Cu(2) is bonded in a tetrahedral geometry to two equivalent O(1) and two equivalent O(2) atoms. There are four inequivalent O sites. In the first O site, O(1) is bonded in a rectangular see-saw-like geometry to one Rh(1), two equivalent Rh(2), and one Cu(2) atom. In the second O site, O(2) is bonded in a rectangular see-saw-like geometry to one Rh(2), two equivalent Rh(1), and one Cu(2) atom. In the third O site, O(3) is bonded in a 5-coordinate geometry to one Mg(1), one Rh(2), two equivalent Rh(1), and one Cu(1) atom. In the fourth O site, O(4) is bonded in a 5-coordinate geometry to one Mg(1), one Rh(1), two equivalent Rh(2), and one Cu(1) atom.
MgCu2(RhO2)4 crystallizes in the orthorhombic Imm2 space group. Mg(1) is bonded in a distorted body-centered cubic geometry to two equivalent Rh(1), two equivalent Rh(2), two equivalent O(3), and two equivalent O(4) atoms. Both Mg(1)-Rh(1) bond lengths are 2.20 Å. Both Mg(1)-Rh(2) bond lengths are 2.20 Å. Both Mg(1)-O(3) bond lengths are 1.90 Å. Both Mg(1)-O(4) bond lengths are 1.90 Å. There are two inequivalent Rh sites. In the first Rh site, Rh(1) is bonded in a 7-coordinate geometry to one Mg(1), one O(1), one O(4), two equivalent O(2), and two equivalent O(3) atoms. The Rh(1)-O(1) bond length is 2.05 Å. The Rh(1)-O(4) bond length is 2.38 Å. Both Rh(1)-O(2) bond lengths are 2.05 Å. Both Rh(1)-O(3) bond lengths are 2.38 Å. In the second Rh site, Rh(2) is bonded in a 7-coordinate geometry to one Mg(1), one O(2), one O(3), two equivalent O(1), and two equivalent O(4) atoms. The Rh(2)-O(2) bond length is 2.05 Å. The Rh(2)-O(3) bond length is 2.38 Å. Both Rh(2)-O(1) bond lengths are 2.05 Å. Both Rh(2)-O(4) bond lengths are 2.38 Å. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a tetrahedral geometry to two equivalent O(3) and two equivalent O(4) atoms. Both Cu(1)-O(3) bond lengths are 2.09 Å. Both Cu(1)-O(4) bond lengths are 2.08 Å. In the second Cu site, Cu(2) is bonded in a tetrahedral geometry to two equivalent O(1) and two equivalent O(2) atoms. Both Cu(2)-O(1) bond lengths are 2.23 Å. Both Cu(2)-O(2) bond lengths are 2.22 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded in a rectangular see-saw-like geometry to one Rh(1), two equivalent Rh(2), and one Cu(2) atom. In the second O site, O(2) is bonded in a rectangular see-saw-like geometry to one Rh(2), two equivalent Rh(1), and one Cu(2) atom. In the third O site, O(3) is bonded in a 5-coordinate geometry to one Mg(1), one Rh(2), two equivalent Rh(1), and one Cu(1) atom. In the fourth O site, O(4) is bonded in a 5-coordinate geometry to one Mg(1), one Rh(1), two equivalent Rh(2), and one Cu(1) atom.