Mg2Cu2CO11 crystallizes in the monoclinic C2/c space group. Mg(1) is bonded in a 6-coordinate geometry to one O(1), one O(5), two equivalent O(2), and two equivalent O(4) atoms. Cu(1) is bonded to one O(2), one O(4), one O(5), and two equivalent O(3) atoms to form edge-sharing CuO5 trigonal bipyramids. C(1) is bonded in a trigonal planar geometry to one O(6) and two equivalent O(1) atoms. There are six inequivalent O sites. In the first O site, O(4) is bonded in a trigonal non-coplanar geometry to two equivalent Mg(1) and one Cu(1) atom. In the second O site, O(5) is bonded in an L-shaped geometry to one Mg(1) and one Cu(1) atom. In the third O site, O(6) is bonded in a single-bond geometry to one C(1) atom. In the fourth O site, O(1) is bonded in a bent 150 degrees geometry to one Mg(1) and one C(1) atom. In the fifth O site, O(2) is bonded in a 4-coordinate geometry to two equivalent Mg(1), one Cu(1), and one O(2) atom. In the sixth O site, O(3) is bonded in a water-like geometry to two equivalent Cu(1) atoms.
Mg2Cu2CO11 crystallizes in the monoclinic C2/c space group. Mg(1) is bonded in a 6-coordinate geometry to one O(1), one O(5), two equivalent O(2), and two equivalent O(4) atoms. The Mg(1)-O(1) bond length is 2.01 Å. The Mg(1)-O(5) bond length is 2.06 Å. There is one shorter (2.16 Å) and one longer (2.28 Å) Mg(1)-O(2) bond length. There is one shorter (2.05 Å) and one longer (2.09 Å) Mg(1)-O(4) bond length. Cu(1) is bonded to one O(2), one O(4), one O(5), and two equivalent O(3) atoms to form edge-sharing CuO5 trigonal bipyramids. The Cu(1)-O(2) bond length is 1.96 Å. The Cu(1)-O(4) bond length is 1.84 Å. The Cu(1)-O(5) bond length is 2.04 Å. There is one shorter (1.84 Å) and one longer (1.86 Å) Cu(1)-O(3) bond length. C(1) is bonded in a trigonal planar geometry to one O(6) and two equivalent O(1) atoms. The C(1)-O(6) bond length is 1.28 Å. Both C(1)-O(1) bond lengths are 1.28 Å. There are six inequivalent O sites. In the first O site, O(4) is bonded in a trigonal non-coplanar geometry to two equivalent Mg(1) and one Cu(1) atom. In the second O site, O(5) is bonded in an L-shaped geometry to one Mg(1) and one Cu(1) atom. In the third O site, O(6) is bonded in a single-bond geometry to one C(1) atom. In the fourth O site, O(1) is bonded in a bent 150 degrees geometry to one Mg(1) and one C(1) atom. In the fifth O site, O(2) is bonded in a 4-coordinate geometry to two equivalent Mg(1), one Cu(1), and one O(2) atom. The O(2)-O(2) bond length is 1.46 Å. In the sixth O site, O(3) is bonded in a water-like geometry to two equivalent Cu(1) atoms.