MgCu6OF11 crystallizes in the triclinic P1 space group. Mg(1) is bonded to one F(10), one F(11), one F(6), one F(7), and one F(9) atom to form MgF5 trigonal bipyramids that share corners with two equivalent Cu(6)F6 octahedra, corners with two equivalent Cu(2)OF4 trigonal bipyramids,  an edgeedge with one Cu(6)F6 octahedra, and  an edgeedge with one Cu(1)F5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 52-55°. There are six inequivalent Cu sites. In the first Cu site, Cu(1) is bonded to one F(1), one F(11), one F(2), one F(3), and one F(9) atom to form distorted CuF5 trigonal bipyramids that share  a cornercorner with one Cu(6)F6 octahedra, corners with four equivalent Cu(2)OF4 trigonal bipyramids, and  an edgeedge with one Mg(1)F5 trigonal bipyramid. The corner-sharing octahedral tilt angles are 64°. In the second Cu site, Cu(2) is bonded to one O(1), one F(1), one F(11), one F(3), and one F(9) atom to form CuOF4 trigonal bipyramids that share  a cornercorner with one Cu(6)F6 octahedra, corners with two equivalent Mg(1)F5 trigonal bipyramids, and corners with four equivalent Cu(1)F5 trigonal bipyramids. The corner-sharing octahedral tilt angles are 59°. In the third Cu site, Cu(3) is bonded in a 5-coordinate geometry to one O(1), one F(1), one F(2), one F(4), and one F(5) atom. In the fourth Cu site, Cu(4) is bonded in a 6-coordinate geometry to one O(1), one F(2), one F(3), one F(4), one F(5), and one F(7) atom. In the fifth Cu site, Cu(5) is bonded in a 5-coordinate geometry to one F(10), one F(4), one F(5), one F(8), and two equivalent F(6) atoms. In the sixth Cu site, Cu(6) is bonded to one F(10), one F(11), one F(5), one F(6), one F(7), and one F(8) atom to form distorted CuF6 octahedra that share  a cornercorner with one Cu(1)F5 trigonal bipyramid,  a cornercorner with one Cu(2)OF4 trigonal bipyramid, corners with two equivalent Mg(1)F5 trigonal bipyramids, and  an edgeedge with one Mg(1)F5 trigonal bipyramid. O(1) is bonded in a trigonal planar geometry to one Cu(2), one Cu(3), and one Cu(4) atom. There are eleven inequivalent F sites. In the first F site, F(1) is bonded in a distorted trigonal planar geometry to one Cu(1), one Cu(2), and one Cu(3) atom. In the second F site, F(2) is bonded in a distorted trigonal planar geometry to one Cu(1), one Cu(3), and one Cu(4) atom. In the third F site, F(3) is bonded in a 3-coordinate geometry to one Cu(1), one Cu(2), and one Cu(4) atom. In the fourth F site, F(4) is bonded in a 3-coordinate geometry to one Cu(3), one Cu(4), and one Cu(5) atom. In the fifth F site, F(5) is bonded in a 4-coordinate geometry to one Cu(3), one Cu(4), one Cu(5), and one Cu(6) atom. In the sixth F site, F(6) is bonded in a 4-coordinate geometry to one Mg(1), one Cu(6), and two equivalent Cu(5) atoms. In the seventh F site, F(7) is bonded in a distorted water-like geometry to one Mg(1), one Cu(4), and one Cu(6) atom. In the eighth F site, F(8) is bonded in an L-shaped geometry to one Cu(5) and one Cu(6) atom. In the ninth F site, F(9) is bonded in a distorted trigonal planar geometry to one Mg(1), one Cu(1), and one Cu(2) atom. In the tenth F site, F(10) is bonded in a 3-coordinate geometry to one Mg(1), one Cu(5), and one Cu(6) atom. In the eleventh F site, F(11) is bonded in a distorted tetrahedral geometry to one Mg(1), one Cu(1), one Cu(2), and one Cu(6) atom.
MgCu6OF11 crystallizes in the triclinic P1 space group. Mg(1) is bonded to one F(10), one F(11), one F(6), one F(7), and one F(9) atom to form MgF5 trigonal bipyramids that share corners with two equivalent Cu(6)F6 octahedra, corners with two equivalent Cu(2)OF4 trigonal bipyramids,  an edgeedge with one Cu(6)F6 octahedra, and  an edgeedge with one Cu(1)F5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 52-55°. The Mg(1)-F(10) bond length is 1.98 Å. The Mg(1)-F(11) bond length is 2.04 Å. The Mg(1)-F(6) bond length is 2.00 Å. The Mg(1)-F(7) bond length is 1.95 Å. The Mg(1)-F(9) bond length is 1.96 Å. There are six inequivalent Cu sites. In the first Cu site, Cu(1) is bonded to one F(1), one F(11), one F(2), one F(3), and one F(9) atom to form distorted CuF5 trigonal bipyramids that share  a cornercorner with one Cu(6)F6 octahedra, corners with four equivalent Cu(2)OF4 trigonal bipyramids, and  an edgeedge with one Mg(1)F5 trigonal bipyramid. The corner-sharing octahedral tilt angles are 64°. The Cu(1)-F(1) bond length is 1.92 Å. The Cu(1)-F(11) bond length is 2.03 Å. The Cu(1)-F(2) bond length is 2.30 Å. The Cu(1)-F(3) bond length is 1.88 Å. The Cu(1)-F(9) bond length is 2.00 Å. In the second Cu site, Cu(2) is bonded to one O(1), one F(1), one F(11), one F(3), and one F(9) atom to form CuOF4 trigonal bipyramids that share  a cornercorner with one Cu(6)F6 octahedra, corners with two equivalent Mg(1)F5 trigonal bipyramids, and corners with four equivalent Cu(1)F5 trigonal bipyramids. The corner-sharing octahedral tilt angles are 59°. The Cu(2)-O(1) bond length is 1.87 Å. The Cu(2)-F(1) bond length is 1.96 Å. The Cu(2)-F(11) bond length is 2.13 Å. The Cu(2)-F(3) bond length is 2.14 Å. The Cu(2)-F(9) bond length is 2.21 Å. In the third Cu site, Cu(3) is bonded in a 5-coordinate geometry to one O(1), one F(1), one F(2), one F(4), and one F(5) atom. The Cu(3)-O(1) bond length is 1.86 Å. The Cu(3)-F(1) bond length is 2.24 Å. The Cu(3)-F(2) bond length is 1.94 Å. The Cu(3)-F(4) bond length is 2.42 Å. The Cu(3)-F(5) bond length is 1.99 Å. In the fourth Cu site, Cu(4) is bonded in a 6-coordinate geometry to one O(1), one F(2), one F(3), one F(4), one F(5), and one F(7) atom. The Cu(4)-O(1) bond length is 1.87 Å. The Cu(4)-F(2) bond length is 1.91 Å. The Cu(4)-F(3) bond length is 2.44 Å. The Cu(4)-F(4) bond length is 2.02 Å. The Cu(4)-F(5) bond length is 2.00 Å. The Cu(4)-F(7) bond length is 2.59 Å. In the fifth Cu site, Cu(5) is bonded in a 5-coordinate geometry to one F(10), one F(4), one F(5), one F(8), and two equivalent F(6) atoms. The Cu(5)-F(10) bond length is 2.16 Å. The Cu(5)-F(4) bond length is 1.90 Å. The Cu(5)-F(5) bond length is 2.17 Å. The Cu(5)-F(8) bond length is 1.95 Å. There is one shorter (2.26 Å) and one longer (2.56 Å) Cu(5)-F(6) bond length. In the sixth Cu site, Cu(6) is bonded to one F(10), one F(11), one F(5), one F(6), one F(7), and one F(8) atom to form distorted CuF6 octahedra that share  a cornercorner with one Cu(1)F5 trigonal bipyramid,  a cornercorner with one Cu(2)OF4 trigonal bipyramid, corners with two equivalent Mg(1)F5 trigonal bipyramids, and  an edgeedge with one Mg(1)F5 trigonal bipyramid. The Cu(6)-F(10) bond length is 2.18 Å. The Cu(6)-F(11) bond length is 2.39 Å. The Cu(6)-F(5) bond length is 2.50 Å. The Cu(6)-F(6) bond length is 2.14 Å. The Cu(6)-F(7) bond length is 1.89 Å. The Cu(6)-F(8) bond length is 1.89 Å. O(1) is bonded in a trigonal planar geometry to one Cu(2), one Cu(3), and one Cu(4) atom. There are eleven inequivalent F sites. In the first F site, F(1) is bonded in a distorted trigonal planar geometry to one Cu(1), one Cu(2), and one Cu(3) atom. In the second F site, F(2) is bonded in a distorted trigonal planar geometry to one Cu(1), one Cu(3), and one Cu(4) atom. In the third F site, F(3) is bonded in a 3-coordinate geometry to one Cu(1), one Cu(2), and one Cu(4) atom. In the fourth F site, F(4) is bonded in a 3-coordinate geometry to one Cu(3), one Cu(4), and one Cu(5) atom. In the fifth F site, F(5) is bonded in a 4-coordinate geometry to one Cu(3), one Cu(4), one Cu(5), and one Cu(6) atom. In the sixth F site, F(6) is bonded in a 4-coordinate geometry to one Mg(1), one Cu(6), and two equivalent Cu(5) atoms. In the seventh F site, F(7) is bonded in a distorted water-like geometry to one Mg(1), one Cu(4), and one Cu(6) atom. In the eighth F site, F(8) is bonded in an L-shaped geometry to one Cu(5) and one Cu(6) atom. In the ninth F site, F(9) is bonded in a distorted trigonal planar geometry to one Mg(1), one Cu(1), and one Cu(2) atom. In the tenth F site, F(10) is bonded in a 3-coordinate geometry to one Mg(1), one Cu(5), and one Cu(6) atom. In the eleventh F site, F(11) is bonded in a distorted tetrahedral geometry to one Mg(1), one Cu(1), one Cu(2), and one Cu(6) atom.