La4C2Br5 crystallizes in the orthorhombic Immm space group. There are two inequivalent La sites. In the first La site, La(1) is bonded in a 8-coordinate geometry to four equivalent C(1), two equivalent Br(1), and two equivalent Br(2) atoms. In the second La site, La(2) is bonded in a 7-coordinate geometry to one C(1) and six equivalent Br(1) atoms. C(1) is bonded in a 6-coordinate geometry to one La(2), four equivalent La(1), and one C(1) atom. There are two inequivalent Br sites. In the first Br site, Br(1) is bonded in a 4-coordinate geometry to one La(1) and three equivalent La(2) atoms. In the second Br site, Br(2) is bonded in a square co-planar geometry to four equivalent La(1) atoms.
La4C2Br5 crystallizes in the orthorhombic Immm space group. There are two inequivalent La sites. In the first La site, La(1) is bonded in a 8-coordinate geometry to four equivalent C(1), two equivalent Br(1), and two equivalent Br(2) atoms. All La(1)-C(1) bond lengths are 2.73 Å. Both La(1)-Br(1) bond lengths are 3.10 Å. Both La(1)-Br(2) bond lengths are 3.18 Å. In the second La site, La(2) is bonded in a 7-coordinate geometry to one C(1) and six equivalent Br(1) atoms. The La(2)-C(1) bond length is 2.31 Å. There are four shorter (3.07 Å) and two longer (3.62 Å) La(2)-Br(1) bond lengths. C(1) is bonded in a 6-coordinate geometry to one La(2), four equivalent La(1), and one C(1) atom. The C(1)-C(1) bond length is 1.42 Å. There are two inequivalent Br sites. In the first Br site, Br(1) is bonded in a 4-coordinate geometry to one La(1) and three equivalent La(2) atoms. In the second Br site, Br(2) is bonded in a square co-planar geometry to four equivalent La(1) atoms.