TmC2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Tm is bonded in a distorted q4 geometry to ten equivalent C atoms. There are two shorter (2.40 Å) and eight longer (2.63 Å) Tm–C bond lengths. C is bonded in a 6-coordinate geometry to five equivalent Tm and one C atom. The C–C bond length is 1.31 Å.
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