Pr2CoO4 is (La,Ba)CuO4 structured and crystallizes in the tetragonal I4/mmm space group. Pr(1) is bonded in a 9-coordinate geometry to four equivalent O(2) and five equivalent O(1) atoms. Co(1) is bonded to two equivalent O(1) and four equivalent O(2) atoms to form corner-sharing CoO6 octahedra. The corner-sharing octahedra are not tilted. There are two inequivalent O sites. In the first O site, O(2) is bonded to four equivalent Pr(1) and two equivalent Co(1) atoms to form OPr4Co2 octahedra that share corners with two equivalent O(2)Pr4Co2 octahedra, corners with twelve equivalent O(1)Pr5Co octahedra, edges with two equivalent O(2)Pr4Co2 octahedra, faces with four equivalent O(2)Pr4Co2 octahedra, and faces with four equivalent O(1)Pr5Co octahedra. The corner-sharing octahedral tilt angles range from 0-50°. In the second O site, O(1) is bonded to five equivalent Pr(1) and one Co(1) atom to form distorted OPr5Co octahedra that share corners with five equivalent O(1)Pr5Co octahedra, corners with twelve equivalent O(2)Pr4Co2 octahedra, edges with eight equivalent O(1)Pr5Co octahedra, and faces with four equivalent O(2)Pr4Co2 octahedra. The corner-sharing octahedral tilt angles range from 0-50°.
Pr2CoO4 is (La,Ba)CuO4 structured and crystallizes in the tetragonal I4/mmm space group. Pr(1) is bonded in a 9-coordinate geometry to four equivalent O(2) and five equivalent O(1) atoms. All Pr(1)-O(2) bond lengths are 2.60 Å. There is one shorter (2.31 Å) and four longer (2.80 Å) Pr(1)-O(1) bond lengths. Co(1) is bonded to two equivalent O(1) and four equivalent O(2) atoms to form corner-sharing CoO6 octahedra. The corner-sharing octahedra are not tilted. Both Co(1)-O(1) bond lengths are 2.28 Å. All Co(1)-O(2) bond lengths are 1.94 Å. There are two inequivalent O sites. In the first O site, O(2) is bonded to four equivalent Pr(1) and two equivalent Co(1) atoms to form OPr4Co2 octahedra that share corners with two equivalent O(2)Pr4Co2 octahedra, corners with twelve equivalent O(1)Pr5Co octahedra, edges with two equivalent O(2)Pr4Co2 octahedra, faces with four equivalent O(2)Pr4Co2 octahedra, and faces with four equivalent O(1)Pr5Co octahedra. The corner-sharing octahedral tilt angles range from 0-50°. In the second O site, O(1) is bonded to five equivalent Pr(1) and one Co(1) atom to form distorted OPr5Co octahedra that share corners with five equivalent O(1)Pr5Co octahedra, corners with twelve equivalent O(2)Pr4Co2 octahedra, edges with eight equivalent O(1)Pr5Co octahedra, and faces with four equivalent O(2)Pr4Co2 octahedra. The corner-sharing octahedral tilt angles range from 0-50°.