Cs(FO2SOH)OSO2F crystallizes in the monoclinic C2/c space group. Cs(1) is bonded to two equivalent O(3), four equivalent O(1), four equivalent O(2), and two equivalent F(1) atoms to form distorted CsO10F2 cuboctahedra that share corners with eight equivalent S(1)O3F tetrahedra, edges with four equivalent Cs(1)O10F2 cuboctahedra, and edges with two equivalent S(1)O3F tetrahedra. H(1) is bonded in a linear geometry to two equivalent O(3) atoms. S(1) is bonded to one O(1), one O(2), one O(3), and one F(1) atom to form SO3F tetrahedra that share corners with four equivalent Cs(1)O10F2 cuboctahedra and  an edgeedge with one Cs(1)O10F2 cuboctahedra. There are three inequivalent O sites. In the first O site, O(1) is bonded in a single-bond geometry to two equivalent Cs(1) and one S(1) atom. In the second O site, O(2) is bonded in a single-bond geometry to two equivalent Cs(1) and one S(1) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one Cs(1), one H(1), and one S(1) atom. F(1) is bonded in a single-bond geometry to one Cs(1) and one S(1) atom.
Cs(FO2SOH)OSO2F crystallizes in the monoclinic C2/c space group. Cs(1) is bonded to two equivalent O(3), four equivalent O(1), four equivalent O(2), and two equivalent F(1) atoms to form distorted CsO10F2 cuboctahedra that share corners with eight equivalent S(1)O3F tetrahedra, edges with four equivalent Cs(1)O10F2 cuboctahedra, and edges with two equivalent S(1)O3F tetrahedra. Both Cs(1)-O(3) bond lengths are 3.49 Å. There are two shorter (3.14 Å) and two longer (3.38 Å) Cs(1)-O(1) bond lengths. There are two shorter (3.21 Å) and two longer (3.57 Å) Cs(1)-O(2) bond lengths. Both Cs(1)-F(1) bond lengths are 3.31 Å. H(1) is bonded in a linear geometry to two equivalent O(3) atoms. Both H(1)-O(3) bond lengths are 1.21 Å. S(1) is bonded to one O(1), one O(2), one O(3), and one F(1) atom to form SO3F tetrahedra that share corners with four equivalent Cs(1)O10F2 cuboctahedra and  an edgeedge with one Cs(1)O10F2 cuboctahedra. The S(1)-O(1) bond length is 1.44 Å. The S(1)-O(2) bond length is 1.44 Å. The S(1)-O(3) bond length is 1.50 Å. The S(1)-F(1) bond length is 1.62 Å. There are three inequivalent O sites. In the first O site, O(1) is bonded in a single-bond geometry to two equivalent Cs(1) and one S(1) atom. In the second O site, O(2) is bonded in a single-bond geometry to two equivalent Cs(1) and one S(1) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one Cs(1), one H(1), and one S(1) atom. F(1) is bonded in a single-bond geometry to one Cs(1) and one S(1) atom.