Ac3Si crystallizes in the hexagonal P6_3/mmc space group. Ac(1) is bonded in a 4-coordinate geometry to four equivalent Si(1) atoms. Si(1) is bonded to twelve equivalent Ac(1) atoms to form a mixture of distorted face and corner-sharing SiAc12 cuboctahedra.
Ac3Si crystallizes in the hexagonal P6_3/mmc space group. Ac(1) is bonded in a 4-coordinate geometry to four equivalent Si(1) atoms. There are two shorter (3.42 Å) and two longer (3.80 Å) Ac(1)-Si(1) bond lengths. Si(1) is bonded to twelve equivalent Ac(1) atoms to form a mixture of distorted face and corner-sharing SiAc12 cuboctahedra.