Cu8O7 crystallizes in the monoclinic Cm space group. There are six inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a square co-planar geometry to one O(1), one O(3), one O(4), and one O(6) atom. In the second Cu site, Cu(2) is bonded in a distorted T-shaped geometry to one O(2), one O(5), and one O(7) atom. In the third Cu site, Cu(3) is bonded in a square co-planar geometry to one O(1), one O(2), one O(3), and one O(5) atom. In the fourth Cu site, Cu(4) is bonded in a T-shaped geometry to one O(1), one O(5), and one O(6) atom. In the fifth Cu site, Cu(5) is bonded in a rectangular see-saw-like geometry to one O(2), one O(3), one O(4), and one O(7) atom. In the sixth Cu site, Cu(6) is bonded in a distorted T-shaped geometry to one O(4), one O(6), and one O(7) atom. There are seven inequivalent O sites. In the first O site, O(1) is bonded to one Cu(1), one Cu(4), and two equivalent Cu(3) atoms to form a mixture of corner and edge-sharing OCu4 tetrahedra. In the second O site, O(2) is bonded to one Cu(2), one Cu(5), and two equivalent Cu(3) atoms to form a mixture of corner and edge-sharing OCu4 tetrahedra. In the third O site, O(3) is bonded to one Cu(1), one Cu(5), and two equivalent Cu(3) atoms to form a mixture of corner and edge-sharing OCu4 tetrahedra. In the fourth O site, O(4) is bonded to one Cu(1), one Cu(5), and two equivalent Cu(6) atoms to form a mixture of corner and edge-sharing OCu4 tetrahedra. In the fifth O site, O(5) is bonded to one Cu(2), one Cu(4), and two equivalent Cu(3) atoms to form a mixture of corner and edge-sharing OCu4 tetrahedra. In the sixth O site, O(6) is bonded to one Cu(1), one Cu(4), and two equivalent Cu(6) atoms to form a mixture of corner and edge-sharing OCu4 tetrahedra. In the seventh O site, O(7) is bonded to one Cu(2), one Cu(5), and two equivalent Cu(6) atoms to form a mixture of distorted corner and edge-sharing OCu4 tetrahedra.
Cu8O7 crystallizes in the monoclinic Cm space group. There are six inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a square co-planar geometry to one O(1), one O(3), one O(4), and one O(6) atom. The Cu(1)-O(1) bond length is 1.94 Å. The Cu(1)-O(3) bond length is 1.93 Å. The Cu(1)-O(4) bond length is 1.95 Å. The Cu(1)-O(6) bond length is 1.88 Å. In the second Cu site, Cu(2) is bonded in a distorted T-shaped geometry to one O(2), one O(5), and one O(7) atom. The Cu(2)-O(2) bond length is 1.87 Å. The Cu(2)-O(5) bond length is 1.86 Å. The Cu(2)-O(7) bond length is 2.30 Å. In the third Cu site, Cu(3) is bonded in a square co-planar geometry to one O(1), one O(2), one O(3), and one O(5) atom. The Cu(3)-O(1) bond length is 1.94 Å. The Cu(3)-O(2) bond length is 1.97 Å. The Cu(3)-O(3) bond length is 1.91 Å. The Cu(3)-O(5) bond length is 2.01 Å. In the fourth Cu site, Cu(4) is bonded in a T-shaped geometry to one O(1), one O(5), and one O(6) atom. The Cu(4)-O(1) bond length is 1.91 Å. The Cu(4)-O(5) bond length is 1.89 Å. The Cu(4)-O(6) bond length is 2.04 Å. In the fifth Cu site, Cu(5) is bonded in a rectangular see-saw-like geometry to one O(2), one O(3), one O(4), and one O(7) atom. The Cu(5)-O(2) bond length is 1.94 Å. The Cu(5)-O(3) bond length is 1.93 Å. The Cu(5)-O(4) bond length is 1.95 Å. The Cu(5)-O(7) bond length is 1.93 Å. In the sixth Cu site, Cu(6) is bonded in a distorted T-shaped geometry to one O(4), one O(6), and one O(7) atom. The Cu(6)-O(4) bond length is 1.91 Å. The Cu(6)-O(6) bond length is 2.05 Å. The Cu(6)-O(7) bond length is 1.85 Å. There are seven inequivalent O sites. In the first O site, O(1) is bonded to one Cu(1), one Cu(4), and two equivalent Cu(3) atoms to form a mixture of corner and edge-sharing OCu4 tetrahedra. In the second O site, O(2) is bonded to one Cu(2), one Cu(5), and two equivalent Cu(3) atoms to form a mixture of corner and edge-sharing OCu4 tetrahedra. In the third O site, O(3) is bonded to one Cu(1), one Cu(5), and two equivalent Cu(3) atoms to form a mixture of corner and edge-sharing OCu4 tetrahedra. In the fourth O site, O(4) is bonded to one Cu(1), one Cu(5), and two equivalent Cu(6) atoms to form a mixture of corner and edge-sharing OCu4 tetrahedra. In the fifth O site, O(5) is bonded to one Cu(2), one Cu(4), and two equivalent Cu(3) atoms to form a mixture of corner and edge-sharing OCu4 tetrahedra. In the sixth O site, O(6) is bonded to one Cu(1), one Cu(4), and two equivalent Cu(6) atoms to form a mixture of corner and edge-sharing OCu4 tetrahedra. In the seventh O site, O(7) is bonded to one Cu(2), one Cu(5), and two equivalent Cu(6) atoms to form a mixture of distorted corner and edge-sharing OCu4 tetrahedra.