La4YC10 crystallizes in the orthorhombic Fmmm space group. There are two inequivalent La sites. In the first La site, La(1) is bonded in a distorted q4 geometry to two equivalent C(2), two equivalent C(3), and six equivalent C(1) atoms. In the second La site, La(2) is bonded in a distorted q4 geometry to two equivalent C(1) and eight equivalent C(2) atoms. Y(1) is bonded in a distorted q4 geometry to four equivalent C(1) and six equivalent C(3) atoms. There are three inequivalent C sites. In the first C site, C(1) is bonded in a 6-coordinate geometry to one La(2), three equivalent La(1), one Y(1), and one C(1) atom. In the second C site, C(2) is bonded in a 6-coordinate geometry to one La(1), four equivalent La(2), and one C(2) atom. In the third C site, C(3) is bonded in a 6-coordinate geometry to two equivalent La(1), three equivalent Y(1), and one C(3) atom.
La4YC10 crystallizes in the orthorhombic Fmmm space group. There are two inequivalent La sites. In the first La site, La(1) is bonded in a distorted q4 geometry to two equivalent C(2), two equivalent C(3), and six equivalent C(1) atoms. Both La(1)-C(2) bond lengths are 2.83 Å. Both La(1)-C(3) bond lengths are 2.79 Å. There are two shorter (2.61 Å) and four longer (2.86 Å) La(1)-C(1) bond lengths. In the second La site, La(2) is bonded in a distorted q4 geometry to two equivalent C(1) and eight equivalent C(2) atoms. Both La(2)-C(1) bond lengths are 2.91 Å. There are a spread of La(2)-C(2) bond distances ranging from 2.61-2.86 Å. Y(1) is bonded in a distorted q4 geometry to four equivalent C(1) and six equivalent C(3) atoms. All Y(1)-C(1) bond lengths are 2.70 Å. There are two shorter (2.60 Å) and four longer (2.86 Å) Y(1)-C(3) bond lengths. There are three inequivalent C sites. In the first C site, C(1) is bonded in a 6-coordinate geometry to one La(2), three equivalent La(1), one Y(1), and one C(1) atom. The C(1)-C(1) bond length is 1.30 Å. In the second C site, C(2) is bonded in a 6-coordinate geometry to one La(1), four equivalent La(2), and one C(2) atom. The C(2)-C(2) bond length is 1.30 Å. In the third C site, C(3) is bonded in a 6-coordinate geometry to two equivalent La(1), three equivalent Y(1), and one C(3) atom. The C(3)-C(3) bond length is 1.30 Å.