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La2C3 is Plutonium carbide structured and crystallizes in the cubic I-43d space group. The structure is three-dimensional. La3+ is bonded in a 9-coordinate geometry to nine equivalent C2- atoms. There are a spread of La–C bond distances ranging from 2.70–3.00 Å. C2- is bonded in a 5-coordinate geometry to six equivalent La3+ and one C2- atom. The C–C bond length is 1.33 Å.
LaC2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. La2+ is bonded in a distorted q4 geometry to ten equivalent C1- atoms. There are two shorter (2.64 Å) and eight longer (2.86 Å) La–C bond lengths. C1- is bonded in a 6-coordinate geometry to five equivalent La2+ and one C1- atom. The C–C bond length is 1.30 Å.
LaC is Tungsten Carbide structured and crystallizes in the hexagonal P-6m2 space group. The structure is three-dimensional. La3+ is bonded to six equivalent C3- atoms to form a mixture of distorted edge, face, and corner-sharing LaC6 pentagonal pyramids. All La–C bond lengths are 2.70 Å. C3- is bonded to six equivalent La3+ atoms to form a mixture of distorted edge, face, and corner-sharing CLa6 pentagonal pyramids.