GdFeC2 crystallizes in the orthorhombic Amm2 space group. Gd(1) is bonded in a 8-coordinate geometry to eight equivalent C(1) atoms. Fe(1) is bonded in a 4-coordinate geometry to four equivalent C(1) atoms. C(1) is bonded in a 7-coordinate geometry to four equivalent Gd(1), two equivalent Fe(1), and one C(1) atom.
GdFeC2 crystallizes in the orthorhombic Amm2 space group. Gd(1) is bonded in a 8-coordinate geometry to eight equivalent C(1) atoms. There are four shorter (2.64 Å) and four longer (2.72 Å) Gd(1)-C(1) bond lengths. Fe(1) is bonded in a 4-coordinate geometry to four equivalent C(1) atoms. There are two shorter (1.94 Å) and two longer (1.98 Å) Fe(1)-C(1) bond lengths. C(1) is bonded in a 7-coordinate geometry to four equivalent Gd(1), two equivalent Fe(1), and one C(1) atom. The C(1)-C(1) bond length is 1.40 Å.