Cr4OF11 crystallizes in the monoclinic C2 space group. There are four inequivalent Cr sites. In the first Cr site, Cr(1) is bonded to one O(1), one F(1), one F(2), one F(4), one F(5), and one F(8) atom to form CrOF5 octahedra that share corners with three equivalent Cr(4)F6 octahedra and corners with three equivalent Cr(2)OF5 octahedra. The corner-sharing octahedral tilt angles range from 35-39°. In the second Cr site, Cr(2) is bonded to one O(1), one F(10), one F(2), one F(3), one F(5), and one F(7) atom to form CrOF5 octahedra that share corners with three equivalent Cr(3)F6 octahedra and corners with three equivalent Cr(1)OF5 octahedra. The corner-sharing octahedral tilt angles range from 35-40°. In the third Cr site, Cr(3) is bonded to one F(10), one F(12), one F(3), one F(7), and two equivalent F(6) atoms to form CrF6 octahedra that share corners with three equivalent Cr(3)F6 octahedra and corners with three equivalent Cr(2)OF5 octahedra. The corner-sharing octahedral tilt angles range from 35-40°. In the fourth Cr site, Cr(4) is bonded to one F(1), one F(11), one F(4), one F(8), and two equivalent F(9) atoms to form CrF6 octahedra that share corners with three equivalent Cr(4)F6 octahedra and corners with three equivalent Cr(1)OF5 octahedra. The corner-sharing octahedral tilt angles range from 35-39°. O(1) is bonded in a bent 150 degrees geometry to one Cr(1) and one Cr(2) atom. There are twelve inequivalent F sites. In the first F site, F(9) is bonded in a bent 150 degrees geometry to two equivalent Cr(4) atoms. In the second F site, F(10) is bonded in a bent 150 degrees geometry to one Cr(2) and one Cr(3) atom. In the third F site, F(11) is bonded in a bent 150 degrees geometry to two equivalent Cr(4) atoms. In the fourth F site, F(12) is bonded in a bent 150 degrees geometry to two equivalent Cr(3) atoms. In the fifth F site, F(1) is bonded in a bent 150 degrees geometry to one Cr(1) and one Cr(4) atom. In the sixth F site, F(2) is bonded in a bent 150 degrees geometry to one Cr(1) and one Cr(2) atom. In the seventh F site, F(3) is bonded in a bent 150 degrees geometry to one Cr(2) and one Cr(3) atom. In the eighth F site, F(4) is bonded in a bent 150 degrees geometry to one Cr(1) and one Cr(4) atom. In the ninth F site, F(5) is bonded in a bent 150 degrees geometry to one Cr(1) and one Cr(2) atom. In the tenth F site, F(6) is bonded in a bent 150 degrees geometry to two equivalent Cr(3) atoms. In the eleventh F site, F(7) is bonded in a bent 150 degrees geometry to one Cr(2) and one Cr(3) atom. In the twelfth F site, F(8) is bonded in a bent 150 degrees geometry to one Cr(1) and one Cr(4) atom.
Cr4OF11 crystallizes in the monoclinic C2 space group. There are four inequivalent Cr sites. In the first Cr site, Cr(1) is bonded to one O(1), one F(1), one F(2), one F(4), one F(5), and one F(8) atom to form CrOF5 octahedra that share corners with three equivalent Cr(4)F6 octahedra and corners with three equivalent Cr(2)OF5 octahedra. The corner-sharing octahedral tilt angles range from 35-39°. The Cr(1)-O(1) bond length is 1.84 Å. The Cr(1)-F(1) bond length is 1.99 Å. The Cr(1)-F(2) bond length is 1.96 Å. The Cr(1)-F(4) bond length is 1.94 Å. The Cr(1)-F(5) bond length is 1.94 Å. The Cr(1)-F(8) bond length is 1.94 Å. In the second Cr site, Cr(2) is bonded to one O(1), one F(10), one F(2), one F(3), one F(5), and one F(7) atom to form CrOF5 octahedra that share corners with three equivalent Cr(3)F6 octahedra and corners with three equivalent Cr(1)OF5 octahedra. The corner-sharing octahedral tilt angles range from 35-40°. The Cr(2)-O(1) bond length is 1.82 Å. The Cr(2)-F(10) bond length is 1.99 Å. The Cr(2)-F(2) bond length is 1.97 Å. The Cr(2)-F(3) bond length is 1.95 Å. The Cr(2)-F(5) bond length is 1.95 Å. The Cr(2)-F(7) bond length is 1.97 Å. In the third Cr site, Cr(3) is bonded to one F(10), one F(12), one F(3), one F(7), and two equivalent F(6) atoms to form CrF6 octahedra that share corners with three equivalent Cr(3)F6 octahedra and corners with three equivalent Cr(2)OF5 octahedra. The corner-sharing octahedral tilt angles range from 35-40°. The Cr(3)-F(10) bond length is 1.97 Å. The Cr(3)-F(12) bond length is 1.95 Å. The Cr(3)-F(3) bond length is 1.94 Å. The Cr(3)-F(7) bond length is 1.95 Å. There is one shorter (1.93 Å) and one longer (1.94 Å) Cr(3)-F(6) bond length. In the fourth Cr site, Cr(4) is bonded to one F(1), one F(11), one F(4), one F(8), and two equivalent F(9) atoms to form CrF6 octahedra that share corners with three equivalent Cr(4)F6 octahedra and corners with three equivalent Cr(1)OF5 octahedra. The corner-sharing octahedral tilt angles range from 35-39°. The Cr(4)-F(1) bond length is 1.97 Å. The Cr(4)-F(11) bond length is 1.97 Å. The Cr(4)-F(4) bond length is 1.92 Å. The Cr(4)-F(8) bond length is 1.96 Å. There is one shorter (1.94 Å) and one longer (1.95 Å) Cr(4)-F(9) bond length. O(1) is bonded in a bent 150 degrees geometry to one Cr(1) and one Cr(2) atom. There are twelve inequivalent F sites. In the first F site, F(9) is bonded in a bent 150 degrees geometry to two equivalent Cr(4) atoms. In the second F site, F(10) is bonded in a bent 150 degrees geometry to one Cr(2) and one Cr(3) atom. In the third F site, F(11) is bonded in a bent 150 degrees geometry to two equivalent Cr(4) atoms. In the fourth F site, F(12) is bonded in a bent 150 degrees geometry to two equivalent Cr(3) atoms. In the fifth F site, F(1) is bonded in a bent 150 degrees geometry to one Cr(1) and one Cr(4) atom. In the sixth F site, F(2) is bonded in a bent 150 degrees geometry to one Cr(1) and one Cr(2) atom. In the seventh F site, F(3) is bonded in a bent 150 degrees geometry to one Cr(2) and one Cr(3) atom. In the eighth F site, F(4) is bonded in a bent 150 degrees geometry to one Cr(1) and one Cr(4) atom. In the ninth F site, F(5) is bonded in a bent 150 degrees geometry to one Cr(1) and one Cr(2) atom. In the tenth F site, F(6) is bonded in a bent 150 degrees geometry to two equivalent Cr(3) atoms. In the eleventh F site, F(7) is bonded in a bent 150 degrees geometry to one Cr(2) and one Cr(3) atom. In the twelfth F site, F(8) is bonded in a bent 150 degrees geometry to one Cr(1) and one Cr(4) atom.