Cu4O3 crystallizes in the tetragonal I4_1/amd 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 in a linear geometry to two equivalent O(2) atoms. There are two inequivalent O sites. In the first O site, O(1) is bonded to four equivalent Cu(1) atoms to form a mixture of edge and corner-sharing OCu4 tetrahedra. In the second O site, O(2) is bonded to two equivalent Cu(1) and two equivalent Cu(2) atoms to form a mixture of edge and corner-sharing OCu4 tetrahedra.
Cu4O3 crystallizes in the tetragonal I4_1/amd 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 1.90 Å. Both Cu(1)-O(2) bond lengths are 1.98 Å. In the second Cu site, Cu(2) is bonded in a linear geometry to two equivalent O(2) atoms. Both Cu(2)-O(2) bond lengths are 1.83 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded to four equivalent Cu(1) atoms to form a mixture of edge and corner-sharing OCu4 tetrahedra. In the second O site, O(2) is bonded to two equivalent Cu(1) and two equivalent Cu(2) atoms to form a mixture of edge and corner-sharing OCu4 tetrahedra.