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Gd2C is trigonal omega-like structured and crystallizes in the trigonal R-3m space group. The structure is two-dimensional and consists of three Gd2C sheets oriented in the (0, 0, 1) direction. Gd is bonded in a distorted T-shaped geometry to three equivalent C atoms. All Gd–C bond lengths are 2.50 Å. C is bonded to six equivalent Gd atoms to form edge-sharing CGd6 octahedra.
Gd2O2CN2 crystallizes in the trigonal P-3m1 space group. The structure is three-dimensional. Gd3+ is bonded in a 7-coordinate geometry to three equivalent N3- and four equivalent O2- atoms. All Gd–N bond lengths are 2.61 Å. There are three shorter (2.28 Å) and one longer (2.33 Å) Gd–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 Gd3+ and one C4+ atom. O2- is bonded to four equivalent Gd3+ atoms to form a mixture of edge and corner-sharing OGd4 tetrahedra.