Cs2KRuF6 is (Cubic) Perovskite-derived structured and crystallizes in the tetragonal I4/mmm space group. Cs(1) is bonded to four equivalent F(2) and eight equivalent F(1) atoms to form CsF12 cuboctahedra that share corners with twelve equivalent Cs(1)F12 cuboctahedra, faces with six equivalent Cs(1)F12 cuboctahedra, faces with four equivalent K(1)F6 octahedra, and faces with four equivalent Ru(1)F6 octahedra. K(1) is bonded to two equivalent F(2) and four equivalent F(1) atoms to form KF6 octahedra that share corners with six equivalent Ru(1)F6 octahedra and faces with eight equivalent Cs(1)F12 cuboctahedra. The corner-sharing octahedra are not tilted. Ru(1) is bonded to two equivalent F(2) and four equivalent F(1) atoms to form RuF6 octahedra that share corners with six equivalent K(1)F6 octahedra and faces with eight equivalent Cs(1)F12 cuboctahedra. The corner-sharing octahedra are not tilted. There are two inequivalent F sites. In the first F site, F(1) is bonded in a distorted linear geometry to four equivalent Cs(1), one K(1), and one Ru(1) atom. In the second F site, F(2) is bonded in a distorted linear geometry to four equivalent Cs(1), one K(1), and one Ru(1) atom.
Cs2KRuF6 is (Cubic) Perovskite-derived structured and crystallizes in the tetragonal I4/mmm space group. Cs(1) is bonded to four equivalent F(2) and eight equivalent F(1) atoms to form CsF12 cuboctahedra that share corners with twelve equivalent Cs(1)F12 cuboctahedra, faces with six equivalent Cs(1)F12 cuboctahedra, faces with four equivalent K(1)F6 octahedra, and faces with four equivalent Ru(1)F6 octahedra. All Cs(1)-F(2) bond lengths are 3.21 Å. All Cs(1)-F(1) bond lengths are 3.23 Å. K(1) is bonded to two equivalent F(2) and four equivalent F(1) atoms to form KF6 octahedra that share corners with six equivalent Ru(1)F6 octahedra and faces with eight equivalent Cs(1)F12 cuboctahedra. The corner-sharing octahedra are not tilted. Both K(1)-F(2) bond lengths are 2.53 Å. All K(1)-F(1) bond lengths are 2.53 Å. Ru(1) is bonded to two equivalent F(2) and four equivalent F(1) atoms to form RuF6 octahedra that share corners with six equivalent K(1)F6 octahedra and faces with eight equivalent Cs(1)F12 cuboctahedra. The corner-sharing octahedra are not tilted. Both Ru(1)-F(2) bond lengths are 2.06 Å. All Ru(1)-F(1) bond lengths are 1.99 Å. There are two inequivalent F sites. In the first F site, F(1) is bonded in a distorted linear geometry to four equivalent Cs(1), one K(1), and one Ru(1) atom. In the second F site, F(2) is bonded in a distorted linear geometry to four equivalent Cs(1), one K(1), and one Ru(1) atom.