Rb2CoF4 is (La,Ba)CuO4 structured and crystallizes in the tetragonal I4/mmm space group. Rb(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 Rb(1) and one Co(1) atom to form distorted FRb5Co octahedra that share corners with five equivalent F(2)Rb5Co octahedra, corners with twelve equivalent F(1)Rb4Co2 octahedra, edges with eight equivalent F(2)Rb5Co octahedra, and faces with four equivalent F(1)Rb4Co2 octahedra. The corner-sharing octahedral tilt angles range from 0-59°. In the second F site, F(1) is bonded to four equivalent Rb(1) and two equivalent Co(1) atoms to form distorted FRb4Co2 octahedra that share corners with two equivalent F(1)Rb4Co2 octahedra, corners with twelve equivalent F(2)Rb5Co octahedra, edges with two equivalent F(1)Rb4Co2 octahedra, faces with four equivalent F(1)Rb4Co2 octahedra, and faces with four equivalent F(2)Rb5Co octahedra. The corner-sharing octahedral tilt angles range from 0-59°.
Rb2CoF4 is (La,Ba)CuO4 structured and crystallizes in the tetragonal I4/mmm space group. Rb(1) is bonded in a 9-coordinate geometry to four equivalent F(1) and five equivalent F(2) atoms. All Rb(1)-F(1) bond lengths are 2.91 Å. There is one shorter (2.89 Å) and four longer (2.97 Å) Rb(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 2.10 Å. There are two inequivalent F sites. In the first F site, F(2) is bonded to five equivalent Rb(1) and one Co(1) atom to form distorted FRb5Co octahedra that share corners with five equivalent F(2)Rb5Co octahedra, corners with twelve equivalent F(1)Rb4Co2 octahedra, edges with eight equivalent F(2)Rb5Co octahedra, and faces with four equivalent F(1)Rb4Co2 octahedra. The corner-sharing octahedral tilt angles range from 0-59°. In the second F site, F(1) is bonded to four equivalent Rb(1) and two equivalent Co(1) atoms to form distorted FRb4Co2 octahedra that share corners with two equivalent F(1)Rb4Co2 octahedra, corners with twelve equivalent F(2)Rb5Co octahedra, edges with two equivalent F(1)Rb4Co2 octahedra, faces with four equivalent F(1)Rb4Co2 octahedra, and faces with four equivalent F(2)Rb5Co octahedra. The corner-sharing octahedral tilt angles range from 0-59°.