Pr3OsO7 crystallizes in the orthorhombic Cmcm space group. There are two inequivalent Pr sites. In the first Pr site, Pr(1) is bonded in a body-centered cubic geometry to four equivalent O(2) and four equivalent O(3) atoms. In the second Pr site, Pr(2) is bonded to one O(1), two equivalent O(2), and four equivalent O(3) atoms to form distorted PrO7 pentagonal bipyramids that share corners with two equivalent Os(1)O6 octahedra, corners with three equivalent Pr(2)O7 pentagonal bipyramids, edges with two equivalent Os(1)O6 octahedra, and edges with two equivalent Pr(2)O7 pentagonal bipyramids. The corner-sharing octahedral tilt angles are 34°. Os(1) is bonded to two equivalent O(1) and four equivalent O(3) atoms to form OsO6 octahedra that share corners with two equivalent Os(1)O6 octahedra, corners with four equivalent Pr(2)O7 pentagonal bipyramids, and edges with four equivalent Pr(2)O7 pentagonal bipyramids. The corner-sharing octahedral tilt angles are 36°. There are three inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to two equivalent Pr(2) and two equivalent Os(1) atoms. In the second O site, O(2) is bonded to two equivalent Pr(1) and two equivalent Pr(2) atoms to form a mixture of edge and corner-sharing OPr4 tetrahedra. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Pr(1), two equivalent Pr(2), and one Os(1) atom.
Pr3OsO7 crystallizes in the orthorhombic Cmcm space group. There are two inequivalent Pr sites. In the first Pr site, Pr(1) is bonded in a body-centered cubic geometry to four equivalent O(2) and four equivalent O(3) atoms. All Pr(1)-O(2) bond lengths are 2.40 Å. All Pr(1)-O(3) bond lengths are 2.75 Å. In the second Pr site, Pr(2) is bonded to one O(1), two equivalent O(2), and four equivalent O(3) atoms to form distorted PrO7 pentagonal bipyramids that share corners with two equivalent Os(1)O6 octahedra, corners with three equivalent Pr(2)O7 pentagonal bipyramids, edges with two equivalent Os(1)O6 octahedra, and edges with two equivalent Pr(2)O7 pentagonal bipyramids. The corner-sharing octahedral tilt angles are 34°. The Pr(2)-O(1) bond length is 2.59 Å. There is one shorter (2.31 Å) and one longer (2.32 Å) Pr(2)-O(2) bond length. There are two shorter (2.46 Å) and two longer (2.51 Å) Pr(2)-O(3) bond lengths. Os(1) is bonded to two equivalent O(1) and four equivalent O(3) atoms to form OsO6 octahedra that share corners with two equivalent Os(1)O6 octahedra, corners with four equivalent Pr(2)O7 pentagonal bipyramids, and edges with four equivalent Pr(2)O7 pentagonal bipyramids. The corner-sharing octahedral tilt angles are 36°. Both Os(1)-O(1) bond lengths are 2.00 Å. All Os(1)-O(3) bond lengths are 1.98 Å. There are three inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to two equivalent Pr(2) and two equivalent Os(1) atoms. In the second O site, O(2) is bonded to two equivalent Pr(1) and two equivalent Pr(2) atoms to form a mixture of edge and corner-sharing OPr4 tetrahedra. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Pr(1), two equivalent Pr(2), and one Os(1) atom.