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Ac3I crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Ac is bonded in a distorted see-saw-like geometry to four equivalent I atoms. There are two shorter (3.77 Å) and two longer (3.96 Å) Ac–I bond lengths. I is bonded to twelve equivalent Ac atoms to form a mixture of corner and face-sharing IAc12 cuboctahedra.
Ac3Y is beta Cu3Ti-like structured and crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Ac is bonded to eight equivalent Ac and four equivalent Y atoms to form AcAc8Y4 cuboctahedra that share corners with four equivalent YAc12 cuboctahedra, corners with fourteen equivalent AcAc8Y4 cuboctahedra, edges with six equivalent YAc12 cuboctahedra, edges with twelve equivalent AcAc8Y4 cuboctahedra, faces with four equivalent YAc12 cuboctahedra, and faces with sixteen equivalent AcAc8Y4 cuboctahedra. There are a spread of Ac–Ac bond distances ranging from 3.86–3.98 Å. There are two shorter (3.88 Å) and two longer (3.92 Å) Ac–Y bond lengths. Y is bonded to twelve equivalent Ac atoms to form YAc12 cuboctahedra that share corners with six equivalent YAc12 cuboctahedra, corners with twelve equivalent AcAc8Y4 cuboctahedra, edges with eighteen equivalent AcAc8Y4 cuboctahedra, faces with eight equivalent YAc12 cuboctahedra, and faces with twelve equivalent AcAc8Y4 cuboctahedra.
Ac3Y is beta Cu3Ti-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 Y atoms to form AcAc8Y4 cuboctahedra that share corners with twelve equivalent AcAc8Y4 cuboctahedra, edges with eight equivalent YAc12 cuboctahedra, edges with sixteen AcAc8Y4 cuboctahedra, faces with four equivalent YAc12 cuboctahedra, and faces with fourteen AcAc8Y4 cuboctahedra. All Ac–Ac bond lengths are 3.90 Å. All Ac–Y bond lengths are 3.90 Å. In the second Ac site, Ac is bonded to eight equivalent Ac and four equivalent Y atoms to form AcAc8Y4 cuboctahedra that share corners with four equivalent AcAc8Y4 cuboctahedra, corners with eight equivalent YAc12 cuboctahedra, edges with twenty-four AcAc8Y4 cuboctahedra, faces with six equivalent YAc12 cuboctahedra, and faces with twelve AcAc8Y4 cuboctahedra. All Ac–Y bond lengths are 3.90 Å. Y is bonded to twelve Ac atoms to form YAc12 cuboctahedra that share corners with four equivalent YAc12 cuboctahedra, corners with eight equivalent AcAc8Y4 cuboctahedra, edges with eight equivalent YAc12 cuboctahedra, edges with sixteen equivalent AcAc8Y4 cuboctahedra, faces with four equivalent YAc12 cuboctahedra, and faces with fourteen AcAc8Y4 cuboctahedra.
AcY3 is Uranium Silicide structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Ac is bonded to twelve equivalent Y atoms to form AcY12 cuboctahedra that share corners with twelve equivalent AcY12 cuboctahedra, edges with twenty-four equivalent YAc4Y8 cuboctahedra, faces with six equivalent AcY12 cuboctahedra, and faces with twelve equivalent YAc4Y8 cuboctahedra. All Ac–Y bond lengths are 3.69 Å. Y is bonded to four equivalent Ac and eight equivalent Y atoms to form YAc4Y8 cuboctahedra that share corners with twelve equivalent YAc4Y8 cuboctahedra, edges with eight equivalent AcY12 cuboctahedra, edges with sixteen equivalent YAc4Y8 cuboctahedra, faces with four equivalent AcY12 cuboctahedra, and faces with fourteen equivalent YAc4Y8 cuboctahedra. All Y–Y bond lengths are 3.69 Å.
Ac3I 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 four equivalent I atoms to form a mixture of distorted corner and edge-sharing AcI4 cuboctahedra. All Ac–I bond lengths are 3.93 Å. In the second Ac site, Ac is bonded in a square co-planar geometry to four equivalent I atoms. All Ac–I bond lengths are 3.85 Å. I is bonded to twelve Ac atoms to form a mixture of corner, edge, and face-sharing IAc12 cuboctahedra.
AcY3 is beta Cu3Ti-like structured and crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Ac is bonded to twelve Y atoms to form AcY12 cuboctahedra that share corners with four equivalent AcY12 cuboctahedra, corners with eight equivalent YAc4Y8 cuboctahedra, edges with eight equivalent AcY12 cuboctahedra, edges with sixteen equivalent YAc4Y8 cuboctahedra, faces with four equivalent AcY12 cuboctahedra, and faces with fourteen YAc4Y8 cuboctahedra. There are eight shorter (3.69 Å) and four longer (3.70 Å) Ac–Y bond lengths. There are two inequivalent Y sites. In the first Y site, Y is bonded to four equivalent Ac and eight Y atoms to form YAc4Y8 cuboctahedra that share corners with twelve equivalent YAc4Y8 cuboctahedra, edges with eight equivalent AcY12 cuboctahedra, edges with sixteen YAc4Y8 cuboctahedra, faces with four equivalent AcY12 cuboctahedra, and faces with fourteen YAc4Y8 cuboctahedra. There are four shorter (3.69 Å) and four longer (3.70 Å) Y–Y bond lengths. In the second Y site, Y is bonded to four equivalent Ac and eight equivalent Y atoms to form YAc4Y8 cuboctahedra that share corners with four equivalent YAc4Y8 cuboctahedra, corners with eight equivalent AcY12 cuboctahedra, edges with twenty-four YAc4Y8 cuboctahedra, faces with six equivalent AcY12 cuboctahedra, and faces with twelve YAc4Y8 cuboctahedra.