K2CuF4 crystallizes in the orthorhombic Cmmm space group. K(1) is bonded in a 10-coordinate geometry to two equivalent F(1), two equivalent F(2), and six equivalent F(3) atoms. Cu(1) is bonded to two equivalent F(1), two equivalent F(2), and two equivalent F(3) atoms to form corner-sharing CuF6 octahedra. The corner-sharing octahedra are not tilted. There are three inequivalent F sites. In the first F site, F(1) is bonded to four equivalent K(1) and two equivalent Cu(1) atoms to form a mixture of corner and edge-sharing FK4Cu2 octahedra. The corner-sharing octahedra are not tilted. In the second F site, F(2) is bonded in a distorted linear geometry to four equivalent K(1) and two equivalent Cu(1) atoms. In the third F site, F(3) is bonded in a distorted single-bond geometry to six equivalent K(1) and one Cu(1) atom.
K2CuF4 crystallizes in the orthorhombic Cmmm space group. K(1) is bonded in a 10-coordinate geometry to two equivalent F(1), two equivalent F(2), and six equivalent F(3) atoms. Both K(1)-F(1) bond lengths are 2.68 Å. Both K(1)-F(2) bond lengths are 2.88 Å. There are four shorter (2.96 Å) and two longer (3.09 Å) K(1)-F(3) bond lengths. Cu(1) is bonded to two equivalent F(1), two equivalent F(2), and two equivalent F(3) atoms to form corner-sharing CuF6 octahedra. The corner-sharing octahedra are not tilted. Both Cu(1)-F(1) bond lengths are 2.22 Å. Both Cu(1)-F(2) bond lengths are 1.96 Å. Both Cu(1)-F(3) bond lengths are 1.96 Å. There are three inequivalent F sites. In the first F site, F(1) is bonded to four equivalent K(1) and two equivalent Cu(1) atoms to form a mixture of corner and edge-sharing FK4Cu2 octahedra. The corner-sharing octahedra are not tilted. In the second F site, F(2) is bonded in a distorted linear geometry to four equivalent K(1) and two equivalent Cu(1) atoms. In the third F site, F(3) is bonded in a distorted single-bond geometry to six equivalent K(1) and one Cu(1) atom.