Cu3(CO4)2 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a square co-planar geometry to two equivalent O(1) and two equivalent O(2) atoms. In the second Cu site, Cu(2) is bonded to one O(4), two equivalent O(1), and two equivalent O(3) atoms to form distorted edge-sharing CuO5 square pyramids. C(1) is bonded in a trigonal planar geometry to one O(2), one O(3), and one O(4) atom. There are four inequivalent O sites. In the first O site, O(1) is bonded in a trigonal non-coplanar geometry to one Cu(1) and two equivalent Cu(2) atoms. In the second O site, O(2) is bonded in a bent 120 degrees geometry to one Cu(1) and one C(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to two equivalent Cu(2) and one C(1) atom. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to one Cu(2) and one C(1) atom.
Cu3(CO4)2 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a square co-planar geometry to two equivalent O(1) and two equivalent O(2) atoms. Both Cu(1)-O(1) bond lengths are 1.85 Å. Both Cu(1)-O(2) bond lengths are 1.89 Å. In the second Cu site, Cu(2) is bonded to one O(4), two equivalent O(1), and two equivalent O(3) atoms to form distorted edge-sharing CuO5 square pyramids. The Cu(2)-O(4) bond length is 1.87 Å. There is one shorter (1.83 Å) and one longer (1.84 Å) Cu(2)-O(1) bond length. There is one shorter (1.89 Å) and one longer (2.45 Å) Cu(2)-O(3) bond length. C(1) is bonded in a trigonal planar geometry to one O(2), one O(3), and one O(4) atom. The C(1)-O(2) bond length is 1.29 Å. The C(1)-O(3) bond length is 1.29 Å. The C(1)-O(4) bond length is 1.28 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded in a trigonal non-coplanar geometry to one Cu(1) and two equivalent Cu(2) atoms. In the second O site, O(2) is bonded in a bent 120 degrees geometry to one Cu(1) and one C(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to two equivalent Cu(2) and one C(1) atom. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to one Cu(2) and one C(1) atom.