Cu2(OH)2CO3 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 rectangular see-saw-like geometry to one O(1), one O(2), one O(4), and one O(5) atom. In the second Cu site, Cu(2) is bonded to one O(2), one O(3), two equivalent O(4), and two equivalent O(5) atoms to form distorted edge-sharing CuO6 octahedra. C(1) is bonded in a trigonal planar geometry to one O(1), one O(2), and one O(3) atom. There are two inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(4) atom. In the second H site, H(2) is bonded in a single-bond geometry to one O(1) and one O(5) atom. There are five inequivalent O sites. In the first O site, O(4) is bonded in a distorted single-bond geometry to one Cu(1), two equivalent Cu(2), and one H(1) atom. In the second O site, O(5) is bonded in a distorted single-bond geometry to one Cu(1), two equivalent Cu(2), and one H(2) atom. In the third O site, O(1) is bonded in a 3-coordinate geometry to one Cu(1), one C(1), and one H(2) atom. In the fourth O site, O(2) is bonded in a 3-coordinate geometry to one Cu(1), one Cu(2), and one C(1) atom. In the fifth O site, O(3) is bonded in a distorted bent 120 degrees geometry to one Cu(2) and one C(1) atom.
Cu2(OH)2CO3 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 rectangular see-saw-like geometry to one O(1), one O(2), one O(4), and one O(5) atom. The Cu(1)-O(1) bond length is 2.00 Å. The Cu(1)-O(2) bond length is 2.06 Å. The Cu(1)-O(4) bond length is 1.92 Å. The Cu(1)-O(5) bond length is 1.93 Å. In the second Cu site, Cu(2) is bonded to one O(2), one O(3), two equivalent O(4), and two equivalent O(5) atoms to form distorted edge-sharing CuO6 octahedra. The Cu(2)-O(2) bond length is 2.12 Å. The Cu(2)-O(3) bond length is 2.07 Å. There is one shorter (1.93 Å) and one longer (2.44 Å) Cu(2)-O(4) bond length. There is one shorter (1.93 Å) and one longer (2.42 Å) Cu(2)-O(5) bond length. C(1) is bonded in a trigonal planar geometry to one O(1), one O(2), and one O(3) atom. The C(1)-O(1) bond length is 1.30 Å. The C(1)-O(2) bond length is 1.31 Å. The C(1)-O(3) bond length is 1.29 Å. There are two inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(4) atom. The H(1)-O(4) bond length is 0.99 Å. In the second H site, H(2) is bonded in a single-bond geometry to one O(1) and one O(5) atom. The H(2)-O(1) bond length is 1.72 Å. The H(2)-O(5) bond length is 0.99 Å. There are five inequivalent O sites. In the first O site, O(4) is bonded in a distorted single-bond geometry to one Cu(1), two equivalent Cu(2), and one H(1) atom. In the second O site, O(5) is bonded in a distorted single-bond geometry to one Cu(1), two equivalent Cu(2), and one H(2) atom. In the third O site, O(1) is bonded in a 3-coordinate geometry to one Cu(1), one C(1), and one H(2) atom. In the fourth O site, O(2) is bonded in a 3-coordinate geometry to one Cu(1), one Cu(2), and one C(1) atom. In the fifth O site, O(3) is bonded in a distorted bent 120 degrees geometry to one Cu(2) and one C(1) atom.