Ba2Cu(CO4)2(CO2)4 crystallizes in the triclinic P-1 space group. The structure is zero-dimensional and consists of four carbon dioxide molecules and one Ba2Cu(CO4)2 cluster. In the Ba2Cu(CO4)2 cluster, Ba(1) is bonded in a 2-coordinate geometry to one O(5) and one O(7) atom. Cu(1) is bonded in a linear geometry to two equivalent O(7) atoms. C(3) is bonded in a trigonal planar geometry to one O(5), one O(6), and one O(8) atom. There are four inequivalent O sites. In the first O site, O(5) is bonded in a distorted single-bond geometry to one Ba(1) and one C(3) atom. In the second O site, O(6) is bonded in a single-bond geometry to one C(3) atom. In the third O site, O(7) is bonded in a bent 120 degrees geometry to one Ba(1) and one Cu(1) atom. In the fourth O site, O(8) is bonded in a distorted single-bond geometry to one C(3) atom.
Ba2Cu(CO4)2(CO2)4 crystallizes in the triclinic P-1 space group. The structure is zero-dimensional and consists of four carbon dioxide molecules and one Ba2Cu(CO4)2 cluster. In the Ba2Cu(CO4)2 cluster, Ba(1) is bonded in a 2-coordinate geometry to one O(5) and one O(7) atom. The Ba(1)-O(5) bond length is 2.62 Å. The Ba(1)-O(7) bond length is 2.50 Å. Cu(1) is bonded in a linear geometry to two equivalent O(7) atoms. Both Cu(1)-O(7) bond lengths are 1.70 Å. C(3) is bonded in a trigonal planar geometry to one O(5), one O(6), and one O(8) atom. The C(3)-O(5) bond length is 1.30 Å. The C(3)-O(6) bond length is 1.28 Å. The C(3)-O(8) bond length is 1.31 Å. There are four inequivalent O sites. In the first O site, O(5) is bonded in a distorted single-bond geometry to one Ba(1) and one C(3) atom. In the second O site, O(6) is bonded in a single-bond geometry to one C(3) atom. In the third O site, O(7) is bonded in a bent 120 degrees geometry to one Ba(1) and one Cu(1) atom. In the fourth O site, O(8) is bonded in a distorted single-bond geometry to one C(3) atom.