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Ac3Ag crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Ac is bonded in a 4-coordinate geometry to four equivalent Ag atoms. There are two shorter (3.57 Å) and two longer (3.87 Å) Ac–Ag bond lengths. Ag is bonded to twelve equivalent Ac atoms to form a mixture of corner and face-sharing AgAc12 cuboctahedra.
Ac3Ag is Uranium Silicide-like structured and crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. there are two inequivalent Ac sites. In the first Ac site, Ac is bonded to eight Ac and four equivalent Ag atoms to form distorted AcAc8Ag4 cuboctahedra that share corners with twelve equivalent AcAc8Ag4 cuboctahedra, edges with eight equivalent AcAc8Ag4 cuboctahedra, edges with eight equivalent AgAc12 cuboctahedra, faces with four equivalent AgAc12 cuboctahedra, and faces with ten equivalent AcAc8Ag4 cuboctahedra. There are four shorter (3.68 Å) and four longer (3.81 Å) Ac–Ac bond lengths. All Ac–Ag bond lengths are 3.81 Å. In the second Ac site, Ac is bonded in a distorted square co-planar geometry to eight equivalent Ac and four equivalent Ag atoms. All Ac–Ag bond lengths are 3.68 Å. Ag is bonded to twelve Ac atoms to form AgAc12 cuboctahedra that share corners with four equivalent AgAc12 cuboctahedra, edges with eight equivalent AgAc12 cuboctahedra, edges with sixteen equivalent AcAc8Ag4 cuboctahedra, faces with four equivalent AgAc12 cuboctahedra, and faces with eight equivalent AcAc8Ag4 cuboctahedra.