Cu2O3 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 two equivalent O(1) and two equivalent O(2) atoms. In the second Cu site, Cu(2) is bonded to one O(1), one O(2), and three equivalent O(3) atoms to form a mixture of distorted corner and edge-sharing CuO5 trigonal bipyramids. There are three inequivalent O sites. In the first O site, O(1) is bonded in a T-shaped geometry to one Cu(2) and two equivalent Cu(1) atoms. In the second O site, O(2) is bonded in a trigonal non-coplanar geometry to one Cu(2) and two equivalent Cu(1) atoms. In the third O site, O(3) is bonded in a T-shaped geometry to three equivalent Cu(2) atoms.
Cu2O3 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 two equivalent O(1) and two equivalent O(2) atoms. Both Cu(1)-O(1) bond lengths are 1.83 Å. There is one shorter (1.85 Å) and one longer (1.87 Å) Cu(1)-O(2) bond length. In the second Cu site, Cu(2) is bonded to one O(1), one O(2), and three equivalent O(3) atoms to form a mixture of distorted corner and edge-sharing CuO5 trigonal bipyramids. The Cu(2)-O(1) bond length is 2.27 Å. The Cu(2)-O(2) bond length is 1.88 Å. There are a spread of Cu(2)-O(3) bond distances ranging from 1.86-1.89 Å. There are three inequivalent O sites. In the first O site, O(1) is bonded in a T-shaped geometry to one Cu(2) and two equivalent Cu(1) atoms. In the second O site, O(2) is bonded in a trigonal non-coplanar geometry to one Cu(2) and two equivalent Cu(1) atoms. In the third O site, O(3) is bonded in a T-shaped geometry to three equivalent Cu(2) atoms.