(Cr3B7O13)2F2 crystallizes in the cubic F-43c space group. The structure consists of eight hydrofluoric acid atoms inside a Cr3B7O13 framework. In the Cr3B7O13 framework, Cr(1) is bonded in a square co-planar geometry to four equivalent O(1) atoms. There are two inequivalent B sites. In the first B site, B(2) is bonded to four equivalent O(1) atoms to form corner-sharing BO4 tetrahedra. In the second B site, B(1) is bonded to one O(2) and three equivalent O(1) atoms to form corner-sharing BO4 tetrahedra. There are two inequivalent O sites. In the first O site, O(2) is bonded in a tetrahedral geometry to four equivalent B(1) atoms. In the second O site, O(1) is bonded in a trigonal planar geometry to one Cr(1), one B(1), and one B(2) atom.
(Cr3B7O13)2F2 crystallizes in the cubic F-43c space group. The structure consists of eight hydrofluoric acid atoms inside a Cr3B7O13 framework. In the Cr3B7O13 framework, Cr(1) is bonded in a square co-planar geometry to four equivalent O(1) atoms. All Cr(1)-O(1) bond lengths are 2.08 Å. There are two inequivalent B sites. In the first B site, B(2) is bonded to four equivalent O(1) atoms to form corner-sharing BO4 tetrahedra. All B(2)-O(1) bond lengths are 1.47 Å. In the second B site, B(1) is bonded to one O(2) and three equivalent O(1) atoms to form corner-sharing BO4 tetrahedra. The B(1)-O(2) bond length is 1.69 Å. All B(1)-O(1) bond lengths are 1.44 Å. There are two inequivalent O sites. In the first O site, O(2) is bonded in a tetrahedral geometry to four equivalent B(1) atoms. In the second O site, O(1) is bonded in a trigonal planar geometry to one Cr(1), one B(1), and one B(2) atom.