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SrCl2 is Fluorite structured and crystallizes in the cubic Fm-3m space group. The structure is three-dimensional. Sr2+ is bonded in a body-centered cubic geometry to eight equivalent Cl1- atoms. All Sr–Cl bond lengths are 3.05 Å. Cl1- is bonded to four equivalent Sr2+ atoms to form a mixture of edge and corner-sharing ClSr4 tetrahedra.
SrCl3 crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Sr is bonded to twelve equivalent Cl atoms to form a mixture of corner and face-sharing SrCl12 cuboctahedra. There are six shorter (3.17 Å) and six longer (3.36 Å) Sr–Cl bond lengths. Cl is bonded in a see-saw-like geometry to four equivalent Sr atoms.