La2Ni5C3 crystallizes in the tetragonal P4/mbm space group. La(1) is bonded in a 14-coordinate geometry to two equivalent Ni(2), eight equivalent Ni(1), and four equivalent C(1) atoms. There are two inequivalent Ni sites. In the first Ni site, Ni(1) is bonded in a distorted bent 150 degrees geometry to four equivalent La(1), one C(1), and one C(2) atom. In the second Ni site, Ni(2) is bonded in a linear geometry to four equivalent La(1) and two equivalent C(2) atoms. There are two inequivalent C sites. In the first C site, C(1) is bonded in a 7-coordinate geometry to four equivalent La(1), two equivalent Ni(1), and one C(1) atom. In the second C site, C(2) is bonded to two equivalent Ni(2) and four equivalent Ni(1) atoms to form corner-sharing CNi6 octahedra. The corner-sharing octahedra are not tilted.
La2Ni5C3 crystallizes in the tetragonal P4/mbm space group. La(1) is bonded in a 14-coordinate geometry to two equivalent Ni(2), eight equivalent Ni(1), and four equivalent C(1) atoms. Both La(1)-Ni(2) bond lengths are 3.10 Å. There are four shorter (2.99 Å) and four longer (3.00 Å) La(1)-Ni(1) bond lengths. All La(1)-C(1) bond lengths are 2.85 Å. There are two inequivalent Ni sites. In the first Ni site, Ni(1) is bonded in a distorted bent 150 degrees geometry to four equivalent La(1), one C(1), and one C(2) atom. The Ni(1)-C(1) bond length is 1.90 Å. The Ni(1)-C(2) bond length is 1.86 Å. In the second Ni site, Ni(2) is bonded in a linear geometry to four equivalent La(1) and two equivalent C(2) atoms. Both Ni(2)-C(2) bond lengths are 2.01 Å. There are two inequivalent C sites. In the first C site, C(1) is bonded in a 7-coordinate geometry to four equivalent La(1), two equivalent Ni(1), and one C(1) atom. The C(1)-C(1) bond length is 1.36 Å. In the second C site, C(2) is bonded to two equivalent Ni(2) and four equivalent Ni(1) atoms to form corner-sharing CNi6 octahedra. The corner-sharing octahedra are not tilted.