Cr(CuO3)2 crystallizes in the monoclinic P2_1/c space group. Cr(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form CrO4 tetrahedra that share corners with two equivalent Cu(1)O6 octahedra, corners with two equivalent Cu(2)O6 octahedra, and corners with three equivalent Cu(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 45-59°. There are three inequivalent Cu sites. In the first Cu site, Cu(1) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(5) atoms to form distorted CuO6 octahedra that share corners with four equivalent Cr(1)O4 tetrahedra, edges with two equivalent Cu(2)O6 octahedra, and edges with two equivalent Cu(3)O6 octahedra. In the second Cu site, Cu(2) is bonded to two equivalent O(3), two equivalent O(4), and two equivalent O(5) atoms to form CuO6 octahedra that share corners with four equivalent Cr(1)O4 tetrahedra, edges with two equivalent Cu(1)O6 octahedra, and edges with two equivalent Cu(3)O6 octahedra. In the third Cu site, Cu(3) is bonded to one O(1), one O(2), one O(4), one O(5), and two equivalent O(6) atoms to form distorted CuO6 octahedra that share corners with two equivalent Cu(3)O6 octahedra, corners with three equivalent Cr(1)O4 tetrahedra,  an edgeedge with one Cu(1)O6 octahedra, and  an edgeedge with one Cu(2)O6 octahedra. The corner-sharing octahedral tilt angles are 44°. There are six inequivalent O sites. In the first O site, O(6) is bonded in a bent 150 degrees geometry to two equivalent Cu(3) atoms. In the second O site, O(1) is bonded in a 3-coordinate geometry to one Cr(1), one Cu(1), and one Cu(3) atom. In the third O site, O(2) is bonded in a distorted single-bond geometry to one Cr(1) and one Cu(3) atom. In the fourth O site, O(3) is bonded in a trigonal planar geometry to one Cr(1), one Cu(1), and one Cu(2) atom. In the fifth O site, O(4) is bonded in a distorted single-bond geometry to one Cr(1), one Cu(2), and one Cu(3) atom. In the sixth O site, O(5) is bonded in a trigonal non-coplanar geometry to one Cu(1), one Cu(2), and one Cu(3) atom.
Cr(CuO3)2 crystallizes in the monoclinic P2_1/c space group. Cr(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form CrO4 tetrahedra that share corners with two equivalent Cu(1)O6 octahedra, corners with two equivalent Cu(2)O6 octahedra, and corners with three equivalent Cu(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 45-59°. The Cr(1)-O(1) bond length is 1.69 Å. The Cr(1)-O(2) bond length is 1.61 Å. The Cr(1)-O(3) bond length is 1.78 Å. The Cr(1)-O(4) bond length is 1.63 Å. There are three inequivalent Cu sites. In the first Cu site, Cu(1) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(5) atoms to form distorted CuO6 octahedra that share corners with four equivalent Cr(1)O4 tetrahedra, edges with two equivalent Cu(2)O6 octahedra, and edges with two equivalent Cu(3)O6 octahedra. Both Cu(1)-O(1) bond lengths are 2.43 Å. Both Cu(1)-O(3) bond lengths are 1.90 Å. Both Cu(1)-O(5) bond lengths are 1.90 Å. In the second Cu site, Cu(2) is bonded to two equivalent O(3), two equivalent O(4), and two equivalent O(5) atoms to form CuO6 octahedra that share corners with four equivalent Cr(1)O4 tetrahedra, edges with two equivalent Cu(1)O6 octahedra, and edges with two equivalent Cu(3)O6 octahedra. Both Cu(2)-O(3) bond lengths are 1.94 Å. Both Cu(2)-O(4) bond lengths are 2.31 Å. Both Cu(2)-O(5) bond lengths are 1.95 Å. In the third Cu site, Cu(3) is bonded to one O(1), one O(2), one O(4), one O(5), and two equivalent O(6) atoms to form distorted CuO6 octahedra that share corners with two equivalent Cu(3)O6 octahedra, corners with three equivalent Cr(1)O4 tetrahedra,  an edgeedge with one Cu(1)O6 octahedra, and  an edgeedge with one Cu(2)O6 octahedra. The corner-sharing octahedral tilt angles are 44°. The Cu(3)-O(1) bond length is 1.95 Å. The Cu(3)-O(2) bond length is 2.32 Å. The Cu(3)-O(4) bond length is 2.39 Å. The Cu(3)-O(5) bond length is 1.94 Å. There is one shorter (1.82 Å) and one longer (1.88 Å) Cu(3)-O(6) bond length. There are six inequivalent O sites. In the first O site, O(6) is bonded in a bent 150 degrees geometry to two equivalent Cu(3) atoms. In the second O site, O(1) is bonded in a 3-coordinate geometry to one Cr(1), one Cu(1), and one Cu(3) atom. In the third O site, O(2) is bonded in a distorted single-bond geometry to one Cr(1) and one Cu(3) atom. In the fourth O site, O(3) is bonded in a trigonal planar geometry to one Cr(1), one Cu(1), and one Cu(2) atom. In the fifth O site, O(4) is bonded in a distorted single-bond geometry to one Cr(1), one Cu(2), and one Cu(3) atom. In the sixth O site, O(5) is bonded in a trigonal non-coplanar geometry to one Cu(1), one Cu(2), and one Cu(3) atom.