K2CoF4 is (La,Ba)CuO4 structured and crystallizes in the tetragonal I4/mmm space group. K(1) is bonded in a 9-coordinate geometry to four equivalent F(1) and five equivalent F(2) atoms. Co(1) is bonded to two equivalent F(2) and four equivalent F(1) atoms to form corner-sharing CoF6 octahedra. The corner-sharing octahedra are not tilted. There are two inequivalent F sites. In the first F site, F(2) is bonded to five equivalent K(1) and one Co(1) atom to form distorted FK5Co octahedra that share corners with five equivalent F(2)K5Co octahedra, corners with twelve equivalent F(1)K4Co2 octahedra, edges with eight equivalent F(2)K5Co octahedra, and faces with four equivalent F(1)K4Co2 octahedra. The corner-sharing octahedral tilt angles range from 0-57°. In the second F site, F(1) is bonded to four equivalent K(1) and two equivalent Co(1) atoms to form distorted FK4Co2 octahedra that share corners with two equivalent F(1)K4Co2 octahedra, corners with twelve equivalent F(2)K5Co octahedra, edges with two equivalent F(1)K4Co2 octahedra, faces with four equivalent F(1)K4Co2 octahedra, and faces with four equivalent F(2)K5Co octahedra. The corner-sharing octahedral tilt angles range from 0-57°.
K2CoF4 is (La,Ba)CuO4 structured and crystallizes in the tetragonal I4/mmm space group. K(1) is bonded in a 9-coordinate geometry to four equivalent F(1) and five equivalent F(2) atoms. All K(1)-F(1) bond lengths are 2.81 Å. There is one shorter (2.66 Å) and four longer (2.92 Å) K(1)-F(2) bond lengths. Co(1) is bonded to two equivalent F(2) and four equivalent F(1) atoms to form corner-sharing CoF6 octahedra. The corner-sharing octahedra are not tilted. Both Co(1)-F(2) bond lengths are 2.04 Å. All Co(1)-F(1) bond lengths are 2.06 Å. There are two inequivalent F sites. In the first F site, F(2) is bonded to five equivalent K(1) and one Co(1) atom to form distorted FK5Co octahedra that share corners with five equivalent F(2)K5Co octahedra, corners with twelve equivalent F(1)K4Co2 octahedra, edges with eight equivalent F(2)K5Co octahedra, and faces with four equivalent F(1)K4Co2 octahedra. The corner-sharing octahedral tilt angles range from 0-57°. In the second F site, F(1) is bonded to four equivalent K(1) and two equivalent Co(1) atoms to form distorted FK4Co2 octahedra that share corners with two equivalent F(1)K4Co2 octahedra, corners with twelve equivalent F(2)K5Co octahedra, edges with two equivalent F(1)K4Co2 octahedra, faces with four equivalent F(1)K4Co2 octahedra, and faces with four equivalent F(2)K5Co octahedra. The corner-sharing octahedral tilt angles range from 0-57°.