Cr6O11 crystallizes in the triclinic P-1 space group. There are six inequivalent Cr sites. In the first Cr site, Cr(1) is bonded to one O(11), one O(2), one O(3), one O(9), and two equivalent O(7) atoms to form a mixture of edge and corner-sharing CrO6 octahedra. The corner-sharing octahedral tilt angles range from 49-52°. In the second Cr site, Cr(2) is bonded to one O(1), one O(2), one O(3), one O(7), and two equivalent O(6) atoms to form a mixture of edge and corner-sharing CrO6 octahedra. The corner-sharing octahedral tilt angles range from 46-53°. In the third Cr site, Cr(3) is bonded to one O(10), one O(11), one O(5), one O(8), and two equivalent O(4) atoms to form a mixture of distorted edge, face, and corner-sharing CrO6 octahedra. The corner-sharing octahedral tilt angles range from 45-55°. In the fourth Cr site, Cr(4) is bonded to one O(1), one O(11), one O(3), one O(4), one O(8), and one O(9) atom to form a mixture of edge and corner-sharing CrO6 octahedra. The corner-sharing octahedral tilt angles range from 45-60°. In the fifth Cr site, Cr(5) is bonded to one O(10), one O(2), one O(5), one O(6), one O(8), and one O(9) atom to form a mixture of edge and corner-sharing CrO6 octahedra. The corner-sharing octahedral tilt angles range from 45-60°. In the sixth Cr site, Cr(6) is bonded to one O(1), one O(4), one O(5), one O(8), and two equivalent O(10) atoms to form a mixture of distorted edge, face, and corner-sharing CrO6 octahedra. The corner-sharing octahedral tilt angles range from 45-55°. There are eleven inequivalent O sites. In the first O site, O(11) is bonded in a trigonal planar geometry to one Cr(1), one Cr(3), and one Cr(4) atom. In the second O site, O(1) is bonded in a distorted trigonal planar geometry to one Cr(2), one Cr(4), and one Cr(6) atom. In the third O site, O(2) is bonded in a trigonal planar geometry to one Cr(1), one Cr(2), and one Cr(5) atom. In the fourth O site, O(3) is bonded in a trigonal planar geometry to one Cr(1), one Cr(2), and one Cr(4) atom. In the fifth O site, O(4) is bonded to one Cr(4), one Cr(6), and two equivalent Cr(3) atoms to form a mixture of edge and corner-sharing OCr4 trigonal pyramids. In the sixth O site, O(5) is bonded in a trigonal planar geometry to one Cr(3), one Cr(5), and one Cr(6) atom. In the seventh O site, O(6) is bonded in a distorted trigonal planar geometry to one Cr(5) and two equivalent Cr(2) atoms. In the eighth O site, O(7) is bonded in a distorted trigonal planar geometry to one Cr(2) and two equivalent Cr(1) atoms. In the ninth O site, O(8) is bonded to one Cr(3), one Cr(4), one Cr(5), and one Cr(6) atom to form distorted edge-sharing OCr4 trigonal pyramids. In the tenth O site, O(9) is bonded in a distorted trigonal planar geometry to one Cr(1), one Cr(4), and one Cr(5) atom. In the eleventh O site, O(10) is bonded to one Cr(3), one Cr(5), and two equivalent Cr(6) atoms to form a mixture of edge and corner-sharing OCr4 trigonal pyramids.
Cr6O11 crystallizes in the triclinic P-1 space group. There are six inequivalent Cr sites. In the first Cr site, Cr(1) is bonded to one O(11), one O(2), one O(3), one O(9), and two equivalent O(7) atoms to form a mixture of edge and corner-sharing CrO6 octahedra. The corner-sharing octahedral tilt angles range from 49-52°. The Cr(1)-O(11) bond length is 1.91 Å. The Cr(1)-O(2) bond length is 1.92 Å. The Cr(1)-O(3) bond length is 1.90 Å. The Cr(1)-O(9) bond length is 1.91 Å. There is one shorter (1.90 Å) and one longer (1.91 Å) Cr(1)-O(7) bond length. In the second Cr site, Cr(2) is bonded to one O(1), one O(2), one O(3), one O(7), and two equivalent O(6) atoms to form a mixture of edge and corner-sharing CrO6 octahedra. The corner-sharing octahedral tilt angles range from 46-53°. The Cr(2)-O(1) bond length is 1.93 Å. The Cr(2)-O(2) bond length is 1.90 Å. The Cr(2)-O(3) bond length is 1.93 Å. The Cr(2)-O(7) bond length is 1.91 Å. There is one shorter (1.91 Å) and one longer (1.92 Å) Cr(2)-O(6) bond length. In the third Cr site, Cr(3) is bonded to one O(10), one O(11), one O(5), one O(8), and two equivalent O(4) atoms to form a mixture of distorted edge, face, and corner-sharing CrO6 octahedra. The corner-sharing octahedral tilt angles range from 45-55°. The Cr(3)-O(10) bond length is 1.95 Å. The Cr(3)-O(11) bond length is 1.87 Å. The Cr(3)-O(5) bond length is 1.85 Å. The Cr(3)-O(8) bond length is 2.07 Å. There is one shorter (1.93 Å) and one longer (2.07 Å) Cr(3)-O(4) bond length. In the fourth Cr site, Cr(4) is bonded to one O(1), one O(11), one O(3), one O(4), one O(8), and one O(9) atom to form a mixture of edge and corner-sharing CrO6 octahedra. The corner-sharing octahedral tilt angles range from 45-60°. The Cr(4)-O(1) bond length is 1.92 Å. The Cr(4)-O(11) bond length is 1.90 Å. The Cr(4)-O(3) bond length is 1.87 Å. The Cr(4)-O(4) bond length is 2.02 Å. The Cr(4)-O(8) bond length is 2.02 Å. The Cr(4)-O(9) bond length is 1.86 Å. In the fifth Cr site, Cr(5) is bonded to one O(10), one O(2), one O(5), one O(6), one O(8), and one O(9) atom to form a mixture of edge and corner-sharing CrO6 octahedra. The corner-sharing octahedral tilt angles range from 45-60°. The Cr(5)-O(10) bond length is 2.00 Å. The Cr(5)-O(2) bond length is 1.88 Å. The Cr(5)-O(5) bond length is 1.94 Å. The Cr(5)-O(6) bond length is 1.88 Å. The Cr(5)-O(8) bond length is 2.03 Å. The Cr(5)-O(9) bond length is 1.91 Å. In the sixth Cr site, Cr(6) is bonded to one O(1), one O(4), one O(5), one O(8), and two equivalent O(10) atoms to form a mixture of distorted edge, face, and corner-sharing CrO6 octahedra. The corner-sharing octahedral tilt angles range from 45-55°. The Cr(6)-O(1) bond length is 1.84 Å. The Cr(6)-O(4) bond length is 1.98 Å. The Cr(6)-O(5) bond length is 1.88 Å. The Cr(6)-O(8) bond length is 2.01 Å. There is one shorter (1.93 Å) and one longer (2.05 Å) Cr(6)-O(10) bond length. There are eleven inequivalent O sites. In the first O site, O(11) is bonded in a trigonal planar geometry to one Cr(1), one Cr(3), and one Cr(4) atom. In the second O site, O(1) is bonded in a distorted trigonal planar geometry to one Cr(2), one Cr(4), and one Cr(6) atom. In the third O site, O(2) is bonded in a trigonal planar geometry to one Cr(1), one Cr(2), and one Cr(5) atom. In the fourth O site, O(3) is bonded in a trigonal planar geometry to one Cr(1), one Cr(2), and one Cr(4) atom. In the fifth O site, O(4) is bonded to one Cr(4), one Cr(6), and two equivalent Cr(3) atoms to form a mixture of edge and corner-sharing OCr4 trigonal pyramids. In the sixth O site, O(5) is bonded in a trigonal planar geometry to one Cr(3), one Cr(5), and one Cr(6) atom. In the seventh O site, O(6) is bonded in a distorted trigonal planar geometry to one Cr(5) and two equivalent Cr(2) atoms. In the eighth O site, O(7) is bonded in a distorted trigonal planar geometry to one Cr(2) and two equivalent Cr(1) atoms. In the ninth O site, O(8) is bonded to one Cr(3), one Cr(4), one Cr(5), and one Cr(6) atom to form distorted edge-sharing OCr4 trigonal pyramids. In the tenth O site, O(9) is bonded in a distorted trigonal planar geometry to one Cr(1), one Cr(4), and one Cr(5) atom. In the eleventh O site, O(10) is bonded to one Cr(3), one Cr(5), and two equivalent Cr(6) atoms to form a mixture of edge and corner-sharing OCr4 trigonal pyramids.