Pr2Ir2O7 crystallizes in the cubic Fd-3m space group. Pr(1) is bonded to two equivalent O(2) and six equivalent O(1) atoms to form distorted PrO8 hexagonal bipyramids that share edges with six equivalent Pr(1)O8 hexagonal bipyramids and edges with six equivalent Ir(1)O6 octahedra. Ir(1) is bonded to six equivalent O(1) atoms to form IrO6 octahedra that share corners with six equivalent Ir(1)O6 octahedra and edges with six equivalent Pr(1)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles are 49°. There are two inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Pr(1) and two equivalent Ir(1) atoms to form distorted OPr2Ir2 tetrahedra that share corners with two equivalent O(2)Pr4 tetrahedra, corners with twelve equivalent O(1)Pr2Ir2 tetrahedra,  an edgeedge with one O(2)Pr4 tetrahedra, and edges with four equivalent O(1)Pr2Ir2 tetrahedra. In the second O site, O(2) is bonded to four equivalent Pr(1) atoms to form OPr4 tetrahedra that share corners with four equivalent O(2)Pr4 tetrahedra, corners with twelve equivalent O(1)Pr2Ir2 tetrahedra, and edges with six equivalent O(1)Pr2Ir2 tetrahedra.
Pr2Ir2O7 crystallizes in the cubic Fd-3m space group. Pr(1) is bonded to two equivalent O(2) and six equivalent O(1) atoms to form distorted PrO8 hexagonal bipyramids that share edges with six equivalent Pr(1)O8 hexagonal bipyramids and edges with six equivalent Ir(1)O6 octahedra. Both Pr(1)-O(2) bond lengths are 2.26 Å. All Pr(1)-O(1) bond lengths are 2.56 Å. Ir(1) is bonded to six equivalent O(1) atoms to form IrO6 octahedra that share corners with six equivalent Ir(1)O6 octahedra and edges with six equivalent Pr(1)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles are 49°. All Ir(1)-O(1) bond lengths are 2.03 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Pr(1) and two equivalent Ir(1) atoms to form distorted OPr2Ir2 tetrahedra that share corners with two equivalent O(2)Pr4 tetrahedra, corners with twelve equivalent O(1)Pr2Ir2 tetrahedra,  an edgeedge with one O(2)Pr4 tetrahedra, and edges with four equivalent O(1)Pr2Ir2 tetrahedra. In the second O site, O(2) is bonded to four equivalent Pr(1) atoms to form OPr4 tetrahedra that share corners with four equivalent O(2)Pr4 tetrahedra, corners with twelve equivalent O(1)Pr2Ir2 tetrahedra, and edges with six equivalent O(1)Pr2Ir2 tetrahedra.