CuHO2 crystallizes in the orthorhombic Cmc2_1 space group. Cu(1) is bonded to two equivalent O(1) and four equivalent O(2) atoms to form a mixture of corner and edge-sharing CuO6 octahedra. The corner-sharing octahedral tilt angles are 21°. H(1) is bonded in a distorted linear geometry to two equivalent O(1) atoms. There are two inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Cu(1) and two equivalent H(1) atoms to form distorted OCu2H2 tetrahedra that share corners with four equivalent O(1)Cu2H2 tetrahedra, corners with six equivalent O(2)Cu4 trigonal pyramids, and  an edgeedge with one O(2)Cu4 trigonal pyramid. In the second O site, O(2) is bonded to four equivalent Cu(1) atoms to form OCu4 trigonal pyramids that share corners with six equivalent O(1)Cu2H2 tetrahedra, corners with four equivalent O(2)Cu4 trigonal pyramids,  an edgeedge with one O(1)Cu2H2 tetrahedra, and edges with four equivalent O(2)Cu4 trigonal pyramids.
CuHO2 crystallizes in the orthorhombic Cmc2_1 space group. Cu(1) is bonded to two equivalent O(1) and four equivalent O(2) atoms to form a mixture of corner and edge-sharing CuO6 octahedra. The corner-sharing octahedral tilt angles are 21°. Both Cu(1)-O(1) bond lengths are 1.97 Å. There are a spread of Cu(1)-O(2) bond distances ranging from 2.00-2.06 Å. H(1) is bonded in a distorted linear geometry to two equivalent O(1) atoms. There is one shorter (1.02 Å) and one longer (1.58 Å) H(1)-O(1) bond length. There are two inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Cu(1) and two equivalent H(1) atoms to form distorted OCu2H2 tetrahedra that share corners with four equivalent O(1)Cu2H2 tetrahedra, corners with six equivalent O(2)Cu4 trigonal pyramids, and  an edgeedge with one O(2)Cu4 trigonal pyramid. In the second O site, O(2) is bonded to four equivalent Cu(1) atoms to form OCu4 trigonal pyramids that share corners with six equivalent O(1)Cu2H2 tetrahedra, corners with four equivalent O(2)Cu4 trigonal pyramids,  an edgeedge with one O(1)Cu2H2 tetrahedra, and edges with four equivalent O(2)Cu4 trigonal pyramids.