(Cs2SeF6)2Cl2 crystallizes in the cubic Fm-3m space group. The structure consists of four hydrochloric acid atoms inside a Cs2SeF6 framework. In the Cs2SeF6 framework, Cs(1) is bonded to twelve equivalent F(1) atoms to form distorted CsF12 cuboctahedra that share corners with twelve equivalent Cs(1)F12 cuboctahedra, faces with six equivalent Cs(1)F12 cuboctahedra, and faces with four equivalent Se(1)F6 octahedra. Se(1) is bonded to six equivalent F(1) atoms to form SeF6 octahedra that share faces with eight equivalent Cs(1)F12 cuboctahedra. F(1) is bonded in a single-bond geometry to four equivalent Cs(1) and one Se(1) atom.
(Cs2SeF6)2Cl2 crystallizes in the cubic Fm-3m space group. The structure consists of four hydrochloric acid atoms inside a Cs2SeF6 framework. In the Cs2SeF6 framework, Cs(1) is bonded to twelve equivalent F(1) atoms to form distorted CsF12 cuboctahedra that share corners with twelve equivalent Cs(1)F12 cuboctahedra, faces with six equivalent Cs(1)F12 cuboctahedra, and faces with four equivalent Se(1)F6 octahedra. All Cs(1)-F(1) bond lengths are 3.49 Å. Se(1) is bonded to six equivalent F(1) atoms to form SeF6 octahedra that share faces with eight equivalent Cs(1)F12 cuboctahedra. All Se(1)-F(1) bond lengths are 1.92 Å. F(1) is bonded in a single-bond geometry to four equivalent Cs(1) and one Se(1) atom.