Cu3O4 crystallizes in the orthorhombic Ibam space group. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a distorted 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 two equivalent O(2) and four equivalent O(1) atoms to form edge-sharing CuO6 octahedra. There are two inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Cu(1) and two equivalent Cu(2) atoms to form a mixture of corner and edge-sharing OCu4 trigonal pyramids. In the second O site, O(2) is bonded in a distorted trigonal non-coplanar geometry to one Cu(2) and two equivalent Cu(1) atoms.
Cu3O4 crystallizes in the orthorhombic Ibam space group. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a distorted square co-planar geometry to two equivalent O(1) and two equivalent O(2) atoms. Both Cu(1)-O(1) bond lengths are 1.90 Å. Both Cu(1)-O(2) bond lengths are 1.87 Å. In the second Cu site, Cu(2) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form edge-sharing CuO6 octahedra. Both Cu(2)-O(2) bond lengths are 1.98 Å. All Cu(2)-O(1) bond lengths are 1.99 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Cu(1) and two equivalent Cu(2) atoms to form a mixture of corner and edge-sharing OCu4 trigonal pyramids. In the second O site, O(2) is bonded in a distorted trigonal non-coplanar geometry to one Cu(2) and two equivalent Cu(1) atoms.