MgCu4(OF2)2 crystallizes in the triclinic P1 space group. Mg(1) is bonded in a tetrahedral geometry to one F(1), one F(2), one F(3), and one F(4) atom. There are four inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a linear geometry to one O(1) and one O(2) atom. In the second Cu site, Cu(2) is bonded in a rectangular see-saw-like geometry to one O(1), one O(2), one F(1), and one F(4) atom. In the third Cu site, Cu(3) is bonded in a rectangular see-saw-like geometry to one O(1), one O(2), one F(2), and one F(3) atom. In the fourth Cu site, Cu(4) is bonded in a distorted linear geometry to one O(1) and one O(2) atom. There are two inequivalent O sites. In the first O site, O(1) is bonded to one Cu(1), one Cu(2), one Cu(3), and one Cu(4) atom to form corner-sharing OCu4 tetrahedra. In the second O site, O(2) is bonded to one Cu(1), one Cu(2), one Cu(3), and one Cu(4) atom to form corner-sharing OCu4 tetrahedra. There are four inequivalent F sites. In the first F site, F(1) is bonded in a distorted linear geometry to one Mg(1) and one Cu(2) atom. In the second F site, F(2) is bonded in a distorted water-like geometry to one Mg(1) and one Cu(3) atom. In the third F site, F(3) is bonded in a distorted linear geometry to one Mg(1) and one Cu(3) atom. In the fourth F site, F(4) is bonded in a distorted water-like geometry to one Mg(1) and one Cu(2) atom.
MgCu4(OF2)2 crystallizes in the triclinic P1 space group. Mg(1) is bonded in a tetrahedral geometry to one F(1), one F(2), one F(3), and one F(4) atom. The Mg(1)-F(1) bond length is 1.87 Å. The Mg(1)-F(2) bond length is 1.90 Å. The Mg(1)-F(3) bond length is 1.87 Å. The Mg(1)-F(4) bond length is 1.90 Å. There are four inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a linear geometry to one O(1) and one O(2) atom. The Cu(1)-O(1) bond length is 1.86 Å. The Cu(1)-O(2) bond length is 1.86 Å. In the second Cu site, Cu(2) is bonded in a rectangular see-saw-like geometry to one O(1), one O(2), one F(1), and one F(4) atom. The Cu(2)-O(1) bond length is 1.97 Å. The Cu(2)-O(2) bond length is 1.98 Å. The Cu(2)-F(1) bond length is 1.97 Å. The Cu(2)-F(4) bond length is 1.99 Å. In the third Cu site, Cu(3) is bonded in a rectangular see-saw-like geometry to one O(1), one O(2), one F(2), and one F(3) atom. The Cu(3)-O(1) bond length is 1.97 Å. The Cu(3)-O(2) bond length is 1.98 Å. The Cu(3)-F(2) bond length is 2.00 Å. The Cu(3)-F(3) bond length is 1.98 Å. In the fourth Cu site, Cu(4) is bonded in a distorted linear geometry to one O(1) and one O(2) atom. The Cu(4)-O(1) bond length is 1.86 Å. The Cu(4)-O(2) bond length is 1.86 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded to one Cu(1), one Cu(2), one Cu(3), and one Cu(4) atom to form corner-sharing OCu4 tetrahedra. In the second O site, O(2) is bonded to one Cu(1), one Cu(2), one Cu(3), and one Cu(4) atom to form corner-sharing OCu4 tetrahedra. There are four inequivalent F sites. In the first F site, F(1) is bonded in a distorted linear geometry to one Mg(1) and one Cu(2) atom. In the second F site, F(2) is bonded in a distorted water-like geometry to one Mg(1) and one Cu(3) atom. In the third F site, F(3) is bonded in a distorted linear geometry to one Mg(1) and one Cu(3) atom. In the fourth F site, F(4) is bonded in a distorted water-like geometry to one Mg(1) and one Cu(2) atom.