HoLa4C10 crystallizes in the orthorhombic Fmmm space group. Ho(1) is bonded in a distorted q4 geometry to four equivalent C(1) and six equivalent C(3) atoms. 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. There are three inequivalent C sites. In the first C site, C(1) is bonded in a 6-coordinate geometry to one Ho(1), one La(2), three equivalent La(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 three equivalent Ho(1), two equivalent La(1), and one C(3) atom.
HoLa4C10 crystallizes in the orthorhombic Fmmm space group. Ho(1) is bonded in a distorted q4 geometry to four equivalent C(1) and six equivalent C(3) atoms. All Ho(1)-C(1) bond lengths are 2.67 Å. There are two shorter (2.60 Å) and four longer (2.85 Å) Ho(1)-C(3) bond lengths. 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 2.77 Å. There are two shorter (2.60 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 2.92 Å. There are a spread of La(2)-C(2) bond distances ranging from 2.60-2.85 Å. There are three inequivalent C sites. In the first C site, C(1) is bonded in a 6-coordinate geometry to one Ho(1), one La(2), three equivalent La(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 three equivalent Ho(1), two equivalent La(1), and one C(3) atom. The C(3)-C(3) bond length is 1.30 Å.