PtCu4O5 crystallizes in the monoclinic P2/m space group. Pt(1) is bonded in a square co-planar geometry to one O(1), one O(2), one O(3), and one O(4) atom. There are five 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 square co-planar geometry to two equivalent O(4) and two equivalent O(5) atoms. In the third Cu site, Cu(3) is bonded in a square co-planar geometry to four equivalent O(3) atoms. In the fourth Cu site, Cu(4) is bonded in a square co-planar geometry to two equivalent O(1) and two equivalent O(3) atoms. In the fifth Cu site, Cu(5) is bonded in a square co-planar geometry to one O(2), one O(4), and two equivalent O(5) atoms. There are five inequivalent O sites. In the first O site, O(1) is bonded to one Pt(1), one Cu(4), and two equivalent Cu(1) atoms to form a mixture of corner and edge-sharing OCu3Pt tetrahedra. In the second O site, O(2) is bonded to one Pt(1), one Cu(5), and two equivalent Cu(1) atoms to form OCu3Pt tetrahedra that share  a cornercorner with one O(3)Cu3Pt tetrahedra, corners with two equivalent O(2)Cu3Pt tetrahedra, corners with two equivalent O(5)Cu4 tetrahedra, corners with three equivalent O(1)Cu3Pt tetrahedra,  an edgeedge with one O(1)Cu3Pt tetrahedra, and  an edgeedge with one O(4)Cu3Pt tetrahedra. In the third O site, O(3) is bonded to one Pt(1), one Cu(4), and two equivalent Cu(3) atoms to form a mixture of corner and edge-sharing OCu3Pt tetrahedra. In the fourth O site, O(4) is bonded to one Pt(1), one Cu(5), and two equivalent Cu(2) atoms to form OCu3Pt tetrahedra that share  a cornercorner with one O(1)Cu3Pt tetrahedra,  a cornercorner with one O(3)Cu3Pt tetrahedra, corners with two equivalent O(4)Cu3Pt tetrahedra, corners with four equivalent O(5)Cu4 tetrahedra,  an edgeedge with one O(2)Cu3Pt tetrahedra, and  an edgeedge with one O(5)Cu4 tetrahedra. In the fifth O site, O(5) is bonded to two equivalent Cu(2) and two equivalent Cu(5) atoms to form OCu4 tetrahedra that share corners with two equivalent O(2)Cu3Pt tetrahedra, corners with two equivalent O(5)Cu4 tetrahedra, corners with four equivalent O(4)Cu3Pt tetrahedra,  an edgeedge with one O(4)Cu3Pt tetrahedra, and  an edgeedge with one O(5)Cu4 tetrahedra.
PtCu4O5 crystallizes in the monoclinic P2/m space group. Pt(1) is bonded in a square co-planar geometry to one O(1), one O(2), one O(3), and one O(4) atom. The Pt(1)-O(1) bond length is 2.03 Å. The Pt(1)-O(2) bond length is 2.03 Å. The Pt(1)-O(3) bond length is 2.03 Å. The Pt(1)-O(4) bond length is 2.02 Å. There are five 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 1.95 Å. Both Cu(1)-O(2) bond lengths are 1.94 Å. In the second Cu site, Cu(2) is bonded in a square co-planar geometry to two equivalent O(4) and two equivalent O(5) atoms. Both Cu(2)-O(4) bond lengths are 1.95 Å. Both Cu(2)-O(5) bond lengths are 1.94 Å. In the third Cu site, Cu(3) is bonded in a square co-planar geometry to four equivalent O(3) atoms. All Cu(3)-O(3) bond lengths are 1.94 Å. In the fourth Cu site, Cu(4) is bonded in a square co-planar geometry to two equivalent O(1) and two equivalent O(3) atoms. Both Cu(4)-O(1) bond lengths are 1.96 Å. Both Cu(4)-O(3) bond lengths are 1.95 Å. In the fifth Cu site, Cu(5) is bonded in a square co-planar geometry to one O(2), one O(4), and two equivalent O(5) atoms. The Cu(5)-O(2) bond length is 1.96 Å. The Cu(5)-O(4) bond length is 1.96 Å. There is one shorter (1.93 Å) and one longer (1.94 Å) Cu(5)-O(5) bond length. There are five inequivalent O sites. In the first O site, O(1) is bonded to one Pt(1), one Cu(4), and two equivalent Cu(1) atoms to form a mixture of corner and edge-sharing OCu3Pt tetrahedra. In the second O site, O(2) is bonded to one Pt(1), one Cu(5), and two equivalent Cu(1) atoms to form OCu3Pt tetrahedra that share  a cornercorner with one O(3)Cu3Pt tetrahedra, corners with two equivalent O(2)Cu3Pt tetrahedra, corners with two equivalent O(5)Cu4 tetrahedra, corners with three equivalent O(1)Cu3Pt tetrahedra,  an edgeedge with one O(1)Cu3Pt tetrahedra, and  an edgeedge with one O(4)Cu3Pt tetrahedra. In the third O site, O(3) is bonded to one Pt(1), one Cu(4), and two equivalent Cu(3) atoms to form a mixture of corner and edge-sharing OCu3Pt tetrahedra. In the fourth O site, O(4) is bonded to one Pt(1), one Cu(5), and two equivalent Cu(2) atoms to form OCu3Pt tetrahedra that share  a cornercorner with one O(1)Cu3Pt tetrahedra,  a cornercorner with one O(3)Cu3Pt tetrahedra, corners with two equivalent O(4)Cu3Pt tetrahedra, corners with four equivalent O(5)Cu4 tetrahedra,  an edgeedge with one O(2)Cu3Pt tetrahedra, and  an edgeedge with one O(5)Cu4 tetrahedra. In the fifth O site, O(5) is bonded to two equivalent Cu(2) and two equivalent Cu(5) atoms to form OCu4 tetrahedra that share corners with two equivalent O(2)Cu3Pt tetrahedra, corners with two equivalent O(5)Cu4 tetrahedra, corners with four equivalent O(4)Cu3Pt tetrahedra,  an edgeedge with one O(4)Cu3Pt tetrahedra, and  an edgeedge with one O(5)Cu4 tetrahedra.