Y5Re2O12 crystallizes in the monoclinic C2/m space group. There are three inequivalent Y sites. In the first Y site, Y(1) is bonded in a 7-coordinate geometry to one O(2), two equivalent O(3), and four equivalent O(4) atoms. In the second Y site, Y(2) is bonded to one O(2), two equivalent O(4), and four equivalent O(3) atoms to form distorted YO7 pentagonal bipyramids that share corners with two equivalent Y(3)O6 octahedra,  an edgeedge with one Y(3)O6 octahedra, edges with two equivalent Re(1)O6 octahedra, and edges with two equivalent Y(2)O7 pentagonal bipyramids. The corner-sharing octahedral tilt angles are 56°. In the third Y site, Y(3) is bonded to two equivalent O(1) and four equivalent O(3) atoms to form YO6 octahedra that share corners with four equivalent Re(1)O6 octahedra, corners with four equivalent Y(2)O7 pentagonal bipyramids, and edges with two equivalent Y(2)O7 pentagonal bipyramids. The corner-sharing octahedral tilt angles are 38°. Re(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(4) atoms to form ReO6 octahedra that share corners with two equivalent Y(3)O6 octahedra, edges with two equivalent Re(1)O6 octahedra, and edges with two equivalent Y(2)O7 pentagonal bipyramids. The corner-sharing octahedral tilt angles are 38°. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Y(3) and two equivalent Re(1) atoms. In the second O site, O(2) is bonded to one Y(1), one Y(2), and two equivalent Re(1) atoms to form distorted OY2Re2 tetrahedra that share corners with two equivalent O(4)Y3Re tetrahedra, corners with six equivalent O(3)Y4 tetrahedra,  an edgeedge with one O(2)Y2Re2 tetrahedra, and edges with four equivalent O(4)Y3Re tetrahedra. In the third O site, O(3) is bonded to one Y(1), one Y(3), and two equivalent Y(2) atoms to form OY4 tetrahedra that share corners with three equivalent O(2)Y2Re2 tetrahedra, corners with four equivalent O(3)Y4 tetrahedra, corners with six equivalent O(4)Y3Re tetrahedra,  an edgeedge with one O(4)Y3Re tetrahedra, and edges with three equivalent O(3)Y4 tetrahedra. In the fourth O site, O(4) is bonded to one Y(2), two equivalent Y(1), and one Re(1) atom to form distorted OY3Re tetrahedra that share  a cornercorner with one O(2)Y2Re2 tetrahedra, corners with four equivalent O(4)Y3Re tetrahedra, corners with six equivalent O(3)Y4 tetrahedra,  an edgeedge with one O(3)Y4 tetrahedra, edges with two equivalent O(2)Y2Re2 tetrahedra, and edges with two equivalent O(4)Y3Re tetrahedra.
Y5Re2O12 crystallizes in the monoclinic C2/m space group. There are three inequivalent Y sites. In the first Y site, Y(1) is bonded in a 7-coordinate geometry to one O(2), two equivalent O(3), and four equivalent O(4) atoms. The Y(1)-O(2) bond length is 2.31 Å. Both Y(1)-O(3) bond lengths are 2.28 Å. There are two shorter (2.27 Å) and two longer (2.47 Å) Y(1)-O(4) bond lengths. In the second Y site, Y(2) is bonded to one O(2), two equivalent O(4), and four equivalent O(3) atoms to form distorted YO7 pentagonal bipyramids that share corners with two equivalent Y(3)O6 octahedra,  an edgeedge with one Y(3)O6 octahedra, edges with two equivalent Re(1)O6 octahedra, and edges with two equivalent Y(2)O7 pentagonal bipyramids. The corner-sharing octahedral tilt angles are 56°. The Y(2)-O(2) bond length is 2.38 Å. Both Y(2)-O(4) bond lengths are 2.42 Å. There are two shorter (2.27 Å) and two longer (2.32 Å) Y(2)-O(3) bond lengths. In the third Y site, Y(3) is bonded to two equivalent O(1) and four equivalent O(3) atoms to form YO6 octahedra that share corners with four equivalent Re(1)O6 octahedra, corners with four equivalent Y(2)O7 pentagonal bipyramids, and edges with two equivalent Y(2)O7 pentagonal bipyramids. The corner-sharing octahedral tilt angles are 38°. Both Y(3)-O(1) bond lengths are 2.20 Å. All Y(3)-O(3) bond lengths are 2.31 Å. Re(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(4) atoms to form ReO6 octahedra that share corners with two equivalent Y(3)O6 octahedra, edges with two equivalent Re(1)O6 octahedra, and edges with two equivalent Y(2)O7 pentagonal bipyramids. The corner-sharing octahedral tilt angles are 38°. Both Re(1)-O(1) bond lengths are 1.97 Å. Both Re(1)-O(2) bond lengths are 2.09 Å. Both Re(1)-O(4) bond lengths are 1.96 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Y(3) and two equivalent Re(1) atoms. In the second O site, O(2) is bonded to one Y(1), one Y(2), and two equivalent Re(1) atoms to form distorted OY2Re2 tetrahedra that share corners with two equivalent O(4)Y3Re tetrahedra, corners with six equivalent O(3)Y4 tetrahedra,  an edgeedge with one O(2)Y2Re2 tetrahedra, and edges with four equivalent O(4)Y3Re tetrahedra. In the third O site, O(3) is bonded to one Y(1), one Y(3), and two equivalent Y(2) atoms to form OY4 tetrahedra that share corners with three equivalent O(2)Y2Re2 tetrahedra, corners with four equivalent O(3)Y4 tetrahedra, corners with six equivalent O(4)Y3Re tetrahedra,  an edgeedge with one O(4)Y3Re tetrahedra, and edges with three equivalent O(3)Y4 tetrahedra. In the fourth O site, O(4) is bonded to one Y(2), two equivalent Y(1), and one Re(1) atom to form distorted OY3Re tetrahedra that share  a cornercorner with one O(2)Y2Re2 tetrahedra, corners with four equivalent O(4)Y3Re tetrahedra, corners with six equivalent O(3)Y4 tetrahedra,  an edgeedge with one O(3)Y4 tetrahedra, edges with two equivalent O(2)Y2Re2 tetrahedra, and edges with two equivalent O(4)Y3Re tetrahedra.