K2MnF4 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(2) and five equivalent F(1) atoms. Mn(1) is bonded to two equivalent F(1) and four equivalent F(2) atoms to form corner-sharing MnF6 octahedra. The corner-sharing octahedra are not tilted. There are two inequivalent F sites. In the first F site, F(2) is bonded to four equivalent K(1) and two equivalent Mn(1) atoms to form distorted FK4Mn2 octahedra that share corners with two equivalent F(2)K4Mn2 octahedra, corners with twelve equivalent F(1)K5Mn octahedra, edges with two equivalent F(2)K4Mn2 octahedra, faces with four equivalent F(2)K4Mn2 octahedra, and faces with four equivalent F(1)K5Mn octahedra. The corner-sharing octahedral tilt angles range from 0-56°. In the second F site, F(1) is bonded to five equivalent K(1) and one Mn(1) atom to form distorted FK5Mn octahedra that share corners with five equivalent F(1)K5Mn octahedra, corners with twelve equivalent F(2)K4Mn2 octahedra, edges with eight equivalent F(1)K5Mn octahedra, and faces with four equivalent F(2)K4Mn2 octahedra. The corner-sharing octahedral tilt angles range from 0-56°.
K2MnF4 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(2) and five equivalent F(1) atoms. All K(1)-F(2) bond lengths are 2.83 Å. There is one shorter (2.57 Å) and four longer (2.94 Å) K(1)-F(1) bond lengths. Mn(1) is bonded to two equivalent F(1) and four equivalent F(2) atoms to form corner-sharing MnF6 octahedra. The corner-sharing octahedra are not tilted. Both Mn(1)-F(1) bond lengths are 2.11 Å. All Mn(1)-F(2) bond lengths are 2.08 Å. There are two inequivalent F sites. In the first F site, F(2) is bonded to four equivalent K(1) and two equivalent Mn(1) atoms to form distorted FK4Mn2 octahedra that share corners with two equivalent F(2)K4Mn2 octahedra, corners with twelve equivalent F(1)K5Mn octahedra, edges with two equivalent F(2)K4Mn2 octahedra, faces with four equivalent F(2)K4Mn2 octahedra, and faces with four equivalent F(1)K5Mn octahedra. The corner-sharing octahedral tilt angles range from 0-56°. In the second F site, F(1) is bonded to five equivalent K(1) and one Mn(1) atom to form distorted FK5Mn octahedra that share corners with five equivalent F(1)K5Mn octahedra, corners with twelve equivalent F(2)K4Mn2 octahedra, edges with eight equivalent F(1)K5Mn octahedra, and faces with four equivalent F(2)K4Mn2 octahedra. The corner-sharing octahedral tilt angles range from 0-56°.