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SrAg2 crystallizes in the orthorhombic Imma space group. The structure is three-dimensional. Sr is bonded in a 12-coordinate geometry to twelve equivalent Ag atoms. There are a spread of Sr–Ag bond distances ranging from 3.36–3.55 Å. Ag is bonded in a 10-coordinate geometry to six equivalent Sr and four equivalent Ag atoms. There are a spread of Ag–Ag bond distances ranging from 2.84–3.06 Å.
SrAg2(O2I)4 crystallizes in the tetragonal I422 space group. The structure is three-dimensional. Sr2+ is bonded in a body-centered cubic geometry to eight equivalent O2- atoms. All Sr–O bond lengths are 2.59 Å. Ag3+ is bonded in a distorted square co-planar geometry to four equivalent O2- atoms. All Ag–O bond lengths are 2.38 Å. O2- is bonded to one Sr2+, one Ag3+, and two equivalent I2+ atoms to form a mixture of distorted edge and corner-sharing OSrAgI2 tetrahedra. There are one shorter (1.99 Å) and one longer (2.44 Å) O–I bond lengths. I2+ is bonded in a square co-planar geometry to four equivalent O2- atoms.