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Er2C is trigonal omega-like structured and crystallizes in the trigonal R-3m space group. The structure is two-dimensional and consists of three Er2C sheets oriented in the (0, 0, 1) direction. Er is bonded in a distorted T-shaped geometry to three equivalent C atoms. All Er–C bond lengths are 2.45 Å. C is bonded to six equivalent Er atoms to form edge-sharing CEr6 octahedra.
Er2C(NO)2 crystallizes in the trigonal P-3m1 space group. The structure is three-dimensional. Er3+ is bonded in a 7-coordinate geometry to three equivalent N3- and four equivalent O2- atoms. All Er–N bond lengths are 2.55 Å. There are three shorter (2.21 Å) and one longer (2.28 Å) Er–O bond lengths. C4+ is bonded in a linear geometry to two equivalent N3- atoms. Both C–N bond lengths are 1.24 Å. N3- is bonded in a 1-coordinate geometry to three equivalent Er3+ and one C4+ atom. O2- is bonded to four equivalent Er3+ atoms to form a mixture of edge and corner-sharing OEr4 tetrahedra.