Y5O4F7 crystallizes in the monoclinic Pc space group. There are five inequivalent Y sites. In the first Y site, Y(1) is bonded in a 7-coordinate geometry to one O(2), one O(3), one O(4), one F(1), one F(2), one F(3), and one F(5) atom. In the second Y site, Y(2) is bonded in a distorted pentagonal pyramidal geometry to one O(2), one O(4), one F(2), one F(3), one F(4), and one F(6) atom. In the third Y site, Y(3) is bonded in a 6-coordinate geometry to one O(1), one O(4), one F(4), one F(5), one F(6), and one F(7) atom. In the fourth Y site, Y(4) is bonded in a 6-coordinate geometry to one O(1), one O(2), one O(3), one F(1), one F(5), one F(6), and one F(7) atom. In the fifth Y site, Y(5) is bonded in a 6-coordinate geometry to one O(1), one O(2), one O(4), two equivalent O(3), and one F(7) atom. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal non-coplanar geometry to one Y(3), one Y(4), and one Y(5) atom. In the second O site, O(2) is bonded to one Y(1), one Y(2), one Y(4), and one Y(5) atom to form a mixture of distorted edge and corner-sharing OY4 tetrahedra. In the third O site, O(3) is bonded to one Y(1), one Y(4), and two equivalent Y(5) atoms to form a mixture of edge and corner-sharing OY4 tetrahedra. In the fourth O site, O(4) is bonded to one Y(1), one Y(2), one Y(3), and one Y(5) atom to form a mixture of edge and corner-sharing OY4 tetrahedra. There are seven inequivalent F sites. In the first F site, F(1) is bonded in a water-like geometry to one Y(1) and one Y(4) atom. In the second F site, F(2) is bonded in a water-like geometry to one Y(1) and one Y(2) atom. In the third F site, F(3) is bonded in a 2-coordinate geometry to one Y(1) and one Y(2) atom. In the fourth F site, F(4) is bonded in a bent 150 degrees geometry to one Y(2) and one Y(3) atom. In the fifth F site, F(5) is bonded in a trigonal non-coplanar geometry to one Y(1), one Y(3), and one Y(4) atom. In the sixth F site, F(6) is bonded in a trigonal non-coplanar geometry to one Y(2), one Y(3), and one Y(4) atom. In the seventh F site, F(7) is bonded in a trigonal non-coplanar geometry to one Y(3), one Y(4), and one Y(5) atom.
Y5O4F7 crystallizes in the monoclinic Pc space group. There are five inequivalent Y sites. In the first Y site, Y(1) is bonded in a 7-coordinate geometry to one O(2), one O(3), one O(4), one F(1), one F(2), one F(3), and one F(5) atom. The Y(1)-O(2) bond length is 2.38 Å. The Y(1)-O(3) bond length is 2.32 Å. The Y(1)-O(4) bond length is 2.31 Å. The Y(1)-F(1) bond length is 2.19 Å. The Y(1)-F(2) bond length is 2.18 Å. The Y(1)-F(3) bond length is 2.57 Å. The Y(1)-F(5) bond length is 2.29 Å. In the second Y site, Y(2) is bonded in a distorted pentagonal pyramidal geometry to one O(2), one O(4), one F(2), one F(3), one F(4), and one F(6) atom. The Y(2)-O(2) bond length is 2.26 Å. The Y(2)-O(4) bond length is 2.27 Å. The Y(2)-F(2) bond length is 2.28 Å. The Y(2)-F(3) bond length is 2.17 Å. The Y(2)-F(4) bond length is 2.20 Å. The Y(2)-F(6) bond length is 2.37 Å. In the third Y site, Y(3) is bonded in a 6-coordinate geometry to one O(1), one O(4), one F(4), one F(5), one F(6), and one F(7) atom. The Y(3)-O(1) bond length is 2.17 Å. The Y(3)-O(4) bond length is 2.37 Å. The Y(3)-F(4) bond length is 2.16 Å. The Y(3)-F(5) bond length is 2.18 Å. The Y(3)-F(6) bond length is 2.30 Å. The Y(3)-F(7) bond length is 2.26 Å. In the fourth Y site, Y(4) is bonded in a 6-coordinate geometry to one O(1), one O(2), one O(3), one F(1), one F(5), one F(6), and one F(7) atom. The Y(4)-O(1) bond length is 2.28 Å. The Y(4)-O(2) bond length is 2.73 Å. The Y(4)-O(3) bond length is 2.36 Å. The Y(4)-F(1) bond length is 2.18 Å. The Y(4)-F(5) bond length is 2.25 Å. The Y(4)-F(6) bond length is 2.39 Å. The Y(4)-F(7) bond length is 2.22 Å. In the fifth Y site, Y(5) is bonded in a 6-coordinate geometry to one O(1), one O(2), one O(4), two equivalent O(3), and one F(7) atom. The Y(5)-O(1) bond length is 2.31 Å. The Y(5)-O(2) bond length is 2.33 Å. The Y(5)-O(4) bond length is 2.33 Å. There is one shorter (2.24 Å) and one longer (2.25 Å) Y(5)-O(3) bond length. The Y(5)-F(7) bond length is 2.49 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal non-coplanar geometry to one Y(3), one Y(4), and one Y(5) atom. In the second O site, O(2) is bonded to one Y(1), one Y(2), one Y(4), and one Y(5) atom to form a mixture of distorted edge and corner-sharing OY4 tetrahedra. In the third O site, O(3) is bonded to one Y(1), one Y(4), and two equivalent Y(5) atoms to form a mixture of edge and corner-sharing OY4 tetrahedra. In the fourth O site, O(4) is bonded to one Y(1), one Y(2), one Y(3), and one Y(5) atom to form a mixture of edge and corner-sharing OY4 tetrahedra. There are seven inequivalent F sites. In the first F site, F(1) is bonded in a water-like geometry to one Y(1) and one Y(4) atom. In the second F site, F(2) is bonded in a water-like geometry to one Y(1) and one Y(2) atom. In the third F site, F(3) is bonded in a 2-coordinate geometry to one Y(1) and one Y(2) atom. In the fourth F site, F(4) is bonded in a bent 150 degrees geometry to one Y(2) and one Y(3) atom. In the fifth F site, F(5) is bonded in a trigonal non-coplanar geometry to one Y(1), one Y(3), and one Y(4) atom. In the sixth F site, F(6) is bonded in a trigonal non-coplanar geometry to one Y(2), one Y(3), and one Y(4) atom. In the seventh F site, F(7) is bonded in a trigonal non-coplanar geometry to one Y(3), one Y(4), and one Y(5) atom.