Gd4B4O11F2 crystallizes in the monoclinic C2/c space group. There are two inequivalent Gd sites. In the first Gd site, Gd(1) is bonded in a 10-coordinate geometry to one O(1), one O(2), one O(4), two equivalent O(3), two equivalent O(5), two equivalent O(6), and one F(1) atom. In the second Gd site, Gd(2) is bonded in a 9-coordinate geometry to one O(1), one O(3), one O(5), one O(6), two equivalent O(2), and three equivalent F(1) atoms. There are two inequivalent B sites. In the first B site, B(1) is bonded to one O(1), one O(2), one O(4), and one O(6) atom to form corner-sharing BO4 tetrahedra. In the second B site, B(2) is bonded in a trigonal planar geometry to one O(1), one O(3), and one O(5) atom. There are six inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 120 degrees geometry to one Gd(1), one Gd(2), one B(1), and one B(2) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one Gd(1), two equivalent Gd(2), and one B(1) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to one Gd(2), two equivalent Gd(1), and one B(2) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to two equivalent Gd(1) and two equivalent B(1) atoms. In the fifth O site, O(5) is bonded in a distorted single-bond geometry to one Gd(2), two equivalent Gd(1), and one B(2) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to one Gd(2), two equivalent Gd(1), and one B(1) atom. F(1) is bonded to one Gd(1) and three equivalent Gd(2) atoms to form a mixture of distorted edge and corner-sharing FGd4 tetrahedra.
Gd4B4O11F2 crystallizes in the monoclinic C2/c space group. There are two inequivalent Gd sites. In the first Gd site, Gd(1) is bonded in a 10-coordinate geometry to one O(1), one O(2), one O(4), two equivalent O(3), two equivalent O(5), two equivalent O(6), and one F(1) atom. The Gd(1)-O(1) bond length is 2.61 Å. The Gd(1)-O(2) bond length is 2.65 Å. The Gd(1)-O(4) bond length is 2.39 Å. There is one shorter (2.38 Å) and one longer (2.49 Å) Gd(1)-O(3) bond length. There is one shorter (2.43 Å) and one longer (2.79 Å) Gd(1)-O(5) bond length. There is one shorter (2.39 Å) and one longer (2.73 Å) Gd(1)-O(6) bond length. The Gd(1)-F(1) bond length is 2.46 Å. In the second Gd site, Gd(2) is bonded in a 9-coordinate geometry to one O(1), one O(3), one O(5), one O(6), two equivalent O(2), and three equivalent F(1) atoms. The Gd(2)-O(1) bond length is 2.46 Å. The Gd(2)-O(3) bond length is 2.47 Å. The Gd(2)-O(5) bond length is 2.46 Å. The Gd(2)-O(6) bond length is 2.41 Å. There is one shorter (2.31 Å) and one longer (2.34 Å) Gd(2)-O(2) bond length. There are a spread of Gd(2)-F(1) bond distances ranging from 2.51-2.87 Å. There are two inequivalent B sites. In the first B site, B(1) is bonded to one O(1), one O(2), one O(4), and one O(6) atom to form corner-sharing BO4 tetrahedra. The B(1)-O(1) bond length is 1.58 Å. The B(1)-O(2) bond length is 1.46 Å. The B(1)-O(4) bond length is 1.51 Å. The B(1)-O(6) bond length is 1.42 Å. In the second B site, B(2) is bonded in a trigonal planar geometry to one O(1), one O(3), and one O(5) atom. The B(2)-O(1) bond length is 1.40 Å. The B(2)-O(3) bond length is 1.38 Å. The B(2)-O(5) bond length is 1.37 Å. There are six inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 120 degrees geometry to one Gd(1), one Gd(2), one B(1), and one B(2) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one Gd(1), two equivalent Gd(2), and one B(1) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to one Gd(2), two equivalent Gd(1), and one B(2) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to two equivalent Gd(1) and two equivalent B(1) atoms. In the fifth O site, O(5) is bonded in a distorted single-bond geometry to one Gd(2), two equivalent Gd(1), and one B(2) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to one Gd(2), two equivalent Gd(1), and one B(1) atom. F(1) is bonded to one Gd(1) and three equivalent Gd(2) atoms to form a mixture of distorted edge and corner-sharing FGd4 tetrahedra.