MgCu2(BiO2)4 crystallizes in the monoclinic C2 space group. Mg(1) is bonded in a 8-coordinate geometry to two equivalent Bi(1), two equivalent Bi(2), two equivalent O(3), and two equivalent O(4) atoms. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a rectangular see-saw-like geometry to two equivalent O(1) and two equivalent O(3) atoms. In the second Cu site, Cu(2) is bonded in a rectangular see-saw-like geometry to two equivalent O(2) and two equivalent O(4) atoms. There are two inequivalent Bi sites. In the first Bi site, Bi(1) is bonded in a 4-coordinate geometry to one Mg(1), two equivalent O(3), and two equivalent O(4) atoms. In the second Bi site, Bi(2) is bonded in a 5-coordinate geometry to one Mg(1), 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 3-coordinate geometry to one Cu(1) and two equivalent Bi(2) atoms. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Cu(2) and two equivalent Bi(2) atoms. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Mg(1), one Cu(1), and two equivalent Bi(1) atoms. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Mg(1), one Cu(2), and two equivalent Bi(1) atoms.
MgCu2(BiO2)4 crystallizes in the monoclinic C2 space group. Mg(1) is bonded in a 8-coordinate geometry to two equivalent Bi(1), two equivalent Bi(2), two equivalent O(3), and two equivalent O(4) atoms. Both Mg(1)-Bi(1) bond lengths are 3.08 Å. Both Mg(1)-Bi(2) bond lengths are 2.91 Å. Both Mg(1)-O(3) bond lengths are 2.77 Å. Both Mg(1)-O(4) bond lengths are 2.83 Å. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a rectangular see-saw-like geometry to two equivalent O(1) and two equivalent O(3) atoms. Both Cu(1)-O(1) bond lengths are 1.92 Å. Both Cu(1)-O(3) bond lengths are 2.03 Å. In the second Cu site, Cu(2) is bonded in a rectangular see-saw-like geometry to two equivalent O(2) and two equivalent O(4) atoms. Both Cu(2)-O(2) bond lengths are 1.92 Å. Both Cu(2)-O(4) bond lengths are 2.02 Å. There are two inequivalent Bi sites. In the first Bi site, Bi(1) is bonded in a 4-coordinate geometry to one Mg(1), two equivalent O(3), and two equivalent O(4) atoms. There is one shorter (2.26 Å) and one longer (2.40 Å) Bi(1)-O(3) bond length. There is one shorter (2.26 Å) and one longer (2.38 Å) Bi(1)-O(4) bond length. In the second Bi site, Bi(2) is bonded in a 5-coordinate geometry to one Mg(1), two equivalent O(1), and two equivalent O(2) atoms. There is one shorter (2.26 Å) and one longer (2.29 Å) Bi(2)-O(1) bond length. There is one shorter (2.27 Å) and one longer (2.29 Å) Bi(2)-O(2) bond length. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Cu(1) and two equivalent Bi(2) atoms. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Cu(2) and two equivalent Bi(2) atoms. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Mg(1), one Cu(1), and two equivalent Bi(1) atoms. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Mg(1), one Cu(2), and two equivalent Bi(1) atoms.