Y7ReO14 crystallizes in the orthorhombic Pnnm space group. There are four inequivalent Y sites. In the first Y site, Y(1) is bonded in a body-centered cubic geometry to two equivalent O(1), two equivalent O(4), and four equivalent O(2) atoms. In the second Y site, Y(2) is bonded to two equivalent O(3) and four equivalent O(2) atoms to form distorted YO6 octahedra that share corners with two equivalent Re(1)O6 octahedra. The corner-sharing octahedral tilt angles are 49°. In the third Y site, Y(3) is bonded in a 7-coordinate geometry to one O(1), one O(3), one O(4), two equivalent O(2), and two equivalent O(5) atoms. In the fourth Y site, Y(4) is bonded to two equivalent O(1), two equivalent O(4), and four equivalent O(5) atoms to form distorted YO8 hexagonal bipyramids that share edges with two equivalent Re(1)O6 octahedra. Re(1) is bonded to two equivalent O(3) and four equivalent O(5) atoms to form ReO6 octahedra that share corners with two equivalent Y(2)O6 octahedra and edges with two equivalent Y(4)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles are 49°. There are five inequivalent O sites. In the first O site, O(1) is bonded to one Y(1), one Y(4), and two equivalent Y(3) atoms to form OY4 tetrahedra that share corners with two equivalent O(1)Y4 tetrahedra, corners with four equivalent O(2)Y4 tetrahedra, corners with four equivalent O(4)Y4 tetrahedra,  an edgeedge with one O(3)Y3Re tetrahedra,  an edgeedge with one O(4)Y4 tetrahedra, and edges with two equivalent O(2)Y4 tetrahedra. In the second O site, O(2) is bonded to one Y(1), one Y(2), and two equivalent Y(3) atoms to form OY4 tetrahedra that share corners with two equivalent O(3)Y3Re tetrahedra, corners with two equivalent O(1)Y4 tetrahedra, corners with two equivalent O(4)Y4 tetrahedra, corners with six equivalent O(2)Y4 tetrahedra,  an edgeedge with one O(3)Y3Re tetrahedra,  an edgeedge with one O(1)Y4 tetrahedra,  an edgeedge with one O(2)Y4 tetrahedra, and  an edgeedge with one O(4)Y4 tetrahedra. In the third O site, O(3) is bonded to one Y(2), two equivalent Y(3), and one Re(1) atom to form distorted OY3Re tetrahedra that share corners with two equivalent O(3)Y3Re tetrahedra, corners with two equivalent O(4)Y4 tetrahedra, corners with four equivalent O(2)Y4 tetrahedra,  an edgeedge with one O(1)Y4 tetrahedra, and edges with two equivalent O(2)Y4 tetrahedra. In the fourth O site, O(4) is bonded to one Y(1), one Y(4), and two equivalent Y(3) atoms to form OY4 tetrahedra that share corners with two equivalent O(3)Y3Re tetrahedra, corners with two equivalent O(4)Y4 tetrahedra, corners with four equivalent O(1)Y4 tetrahedra, corners with four equivalent O(2)Y4 tetrahedra,  an edgeedge with one O(1)Y4 tetrahedra, and edges with two equivalent O(2)Y4 tetrahedra. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Y(4), two equivalent Y(3), and one Re(1) atom.
Y7ReO14 crystallizes in the orthorhombic Pnnm space group. There are four inequivalent Y sites. In the first Y site, Y(1) is bonded in a body-centered cubic geometry to two equivalent O(1), two equivalent O(4), and four equivalent O(2) atoms. Both Y(1)-O(1) bond lengths are 2.52 Å. Both Y(1)-O(4) bond lengths are 2.53 Å. All Y(1)-O(2) bond lengths are 2.50 Å. In the second Y site, Y(2) is bonded to two equivalent O(3) and four equivalent O(2) atoms to form distorted YO6 octahedra that share corners with two equivalent Re(1)O6 octahedra. The corner-sharing octahedral tilt angles are 49°. Both Y(2)-O(3) bond lengths are 2.27 Å. All Y(2)-O(2) bond lengths are 2.26 Å. In the third Y site, Y(3) is bonded in a 7-coordinate geometry to one O(1), one O(3), one O(4), two equivalent O(2), and two equivalent O(5) atoms. The Y(3)-O(1) bond length is 2.24 Å. The Y(3)-O(3) bond length is 2.42 Å. The Y(3)-O(4) bond length is 2.30 Å. There is one shorter (2.26 Å) and one longer (2.32 Å) Y(3)-O(2) bond length. There is one shorter (2.31 Å) and one longer (2.70 Å) Y(3)-O(5) bond length. In the fourth Y site, Y(4) is bonded to two equivalent O(1), two equivalent O(4), and four equivalent O(5) atoms to form distorted YO8 hexagonal bipyramids that share edges with two equivalent Re(1)O6 octahedra. Both Y(4)-O(1) bond lengths are 2.30 Å. Both Y(4)-O(4) bond lengths are 2.24 Å. All Y(4)-O(5) bond lengths are 2.75 Å. Re(1) is bonded to two equivalent O(3) and four equivalent O(5) atoms to form ReO6 octahedra that share corners with two equivalent Y(2)O6 octahedra and edges with two equivalent Y(4)O8 hexagonal bipyramids. The corner-sharing octahedral tilt angles are 49°. Both Re(1)-O(3) bond lengths are 1.92 Å. All Re(1)-O(5) bond lengths are 1.87 Å. There are five inequivalent O sites. In the first O site, O(1) is bonded to one Y(1), one Y(4), and two equivalent Y(3) atoms to form OY4 tetrahedra that share corners with two equivalent O(1)Y4 tetrahedra, corners with four equivalent O(2)Y4 tetrahedra, corners with four equivalent O(4)Y4 tetrahedra,  an edgeedge with one O(3)Y3Re tetrahedra,  an edgeedge with one O(4)Y4 tetrahedra, and edges with two equivalent O(2)Y4 tetrahedra. In the second O site, O(2) is bonded to one Y(1), one Y(2), and two equivalent Y(3) atoms to form OY4 tetrahedra that share corners with two equivalent O(3)Y3Re tetrahedra, corners with two equivalent O(1)Y4 tetrahedra, corners with two equivalent O(4)Y4 tetrahedra, corners with six equivalent O(2)Y4 tetrahedra,  an edgeedge with one O(3)Y3Re tetrahedra,  an edgeedge with one O(1)Y4 tetrahedra,  an edgeedge with one O(2)Y4 tetrahedra, and  an edgeedge with one O(4)Y4 tetrahedra. In the third O site, O(3) is bonded to one Y(2), two equivalent Y(3), and one Re(1) atom to form distorted OY3Re tetrahedra that share corners with two equivalent O(3)Y3Re tetrahedra, corners with two equivalent O(4)Y4 tetrahedra, corners with four equivalent O(2)Y4 tetrahedra,  an edgeedge with one O(1)Y4 tetrahedra, and edges with two equivalent O(2)Y4 tetrahedra. In the fourth O site, O(4) is bonded to one Y(1), one Y(4), and two equivalent Y(3) atoms to form OY4 tetrahedra that share corners with two equivalent O(3)Y3Re tetrahedra, corners with two equivalent O(4)Y4 tetrahedra, corners with four equivalent O(1)Y4 tetrahedra, corners with four equivalent O(2)Y4 tetrahedra,  an edgeedge with one O(1)Y4 tetrahedra, and edges with two equivalent O(2)Y4 tetrahedra. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Y(4), two equivalent Y(3), and one Re(1) atom.