Yb5(BO3)2F9 crystallizes in the monoclinic C2/c space group. There are three inequivalent Yb sites. In the first Yb site, Yb(1) is bonded in a 7-coordinate geometry to two equivalent O(2), one F(2), two equivalent F(1), and two equivalent F(4) atoms. In the second Yb site, Yb(2) is bonded in a 9-coordinate geometry to one O(1), one O(2), one O(3), one F(1), one F(3), one F(4), one F(5), and two equivalent F(2) atoms. In the third Yb site, Yb(3) is bonded in a 7-coordinate geometry to two equivalent O(1), two equivalent O(3), one F(3), and two equivalent F(5) atoms. B(1) is bonded in a tetrahedral geometry to one O(1), one O(2), one O(3), and one F(5) atom. There are three inequivalent O sites. In the first O site, O(2) is bonded in a distorted single-bond geometry to one Yb(2), two equivalent Yb(1), and one B(1) atom. In the second O site, O(3) is bonded in a distorted single-bond geometry to one Yb(2), one Yb(3), and one B(1) atom. In the third O site, O(1) is bonded in a distorted single-bond geometry to one Yb(2), one Yb(3), and one B(1) atom. There are five inequivalent F sites. In the first F site, F(5) is bonded in a distorted single-bond geometry to one Yb(2), one Yb(3), and one B(1) atom. In the second F site, F(3) is bonded in a distorted single-bond geometry to one Yb(3) and two equivalent Yb(2) atoms. In the third F site, F(1) is bonded in a distorted trigonal planar geometry to one Yb(2) and two equivalent Yb(1) atoms. In the fourth F site, F(2) is bonded in a distorted trigonal planar geometry to one Yb(1) and two equivalent Yb(2) atoms. In the fifth F site, F(4) is bonded in a trigonal planar geometry to one Yb(2) and two equivalent Yb(1) atoms.
Yb5(BO3)2F9 crystallizes in the monoclinic C2/c space group. There are three inequivalent Yb sites. In the first Yb site, Yb(1) is bonded in a 7-coordinate geometry to two equivalent O(2), one F(2), two equivalent F(1), and two equivalent F(4) atoms. There is one shorter (2.50 Å) and one longer (2.57 Å) Yb(1)-O(2) bond length. The Yb(1)-F(2) bond length is 2.39 Å. There is one shorter (2.20 Å) and one longer (2.24 Å) Yb(1)-F(1) bond length. There is one shorter (2.19 Å) and one longer (2.22 Å) Yb(1)-F(4) bond length. In the second Yb site, Yb(2) is bonded in a 9-coordinate geometry to one O(1), one O(2), one O(3), one F(1), one F(3), one F(4), one F(5), and two equivalent F(2) atoms. The Yb(2)-O(1) bond length is 2.51 Å. The Yb(2)-O(2) bond length is 2.75 Å. The Yb(2)-O(3) bond length is 2.50 Å. The Yb(2)-F(1) bond length is 2.20 Å. The Yb(2)-F(3) bond length is 2.76 Å. The Yb(2)-F(4) bond length is 2.29 Å. The Yb(2)-F(5) bond length is 2.57 Å. There is one shorter (2.29 Å) and one longer (2.38 Å) Yb(2)-F(2) bond length. In the third Yb site, Yb(3) is bonded in a 7-coordinate geometry to two equivalent O(1), two equivalent O(3), one F(3), and two equivalent F(5) atoms. Both Yb(3)-O(1) bond lengths are 2.32 Å. Both Yb(3)-O(3) bond lengths are 2.50 Å. The Yb(3)-F(3) bond length is 2.10 Å. Both Yb(3)-F(5) bond lengths are 2.36 Å. B(1) is bonded in a tetrahedral geometry to one O(1), one O(2), one O(3), and one F(5) atom. The B(1)-O(1) bond length is 1.42 Å. The B(1)-O(2) bond length is 1.43 Å. The B(1)-O(3) bond length is 1.42 Å. The B(1)-F(5) bond length is 1.49 Å. There are three inequivalent O sites. In the first O site, O(2) is bonded in a distorted single-bond geometry to one Yb(2), two equivalent Yb(1), and one B(1) atom. In the second O site, O(3) is bonded in a distorted single-bond geometry to one Yb(2), one Yb(3), and one B(1) atom. In the third O site, O(1) is bonded in a distorted single-bond geometry to one Yb(2), one Yb(3), and one B(1) atom. There are five inequivalent F sites. In the first F site, F(5) is bonded in a distorted single-bond geometry to one Yb(2), one Yb(3), and one B(1) atom. In the second F site, F(3) is bonded in a distorted single-bond geometry to one Yb(3) and two equivalent Yb(2) atoms. In the third F site, F(1) is bonded in a distorted trigonal planar geometry to one Yb(2) and two equivalent Yb(1) atoms. In the fourth F site, F(2) is bonded in a distorted trigonal planar geometry to one Yb(1) and two equivalent Yb(2) atoms. In the fifth F site, F(4) is bonded in a trigonal planar geometry to one Yb(2) and two equivalent Yb(1) atoms.