La3SiBr3 crystallizes in the cubic I4_132 space group. La(1) is bonded to two equivalent Si(1) and four equivalent Br(1) atoms to form a mixture of edge and corner-sharing LaSi2Br4 octahedra. The corner-sharing octahedral tilt angles range from 3-6°. Si(1) is bonded to six equivalent La(1) atoms to form edge-sharing SiLa6 octahedra. Br(1) is bonded in a rectangular see-saw-like geometry to four equivalent La(1) atoms.
La3SiBr3 crystallizes in the cubic I4_132 space group. La(1) is bonded to two equivalent Si(1) and four equivalent Br(1) atoms to form a mixture of edge and corner-sharing LaSi2Br4 octahedra. The corner-sharing octahedral tilt angles range from 3-6°. Both La(1)-Si(1) bond lengths are 2.95 Å. There are two shorter (3.14 Å) and two longer (3.19 Å) La(1)-Br(1) bond lengths. Si(1) is bonded to six equivalent La(1) atoms to form edge-sharing SiLa6 octahedra. Br(1) is bonded in a rectangular see-saw-like geometry to four equivalent La(1) atoms.