GdB2C2 crystallizes in the tetragonal P4/mbm space group. Gd(1) is bonded in a 16-coordinate geometry to eight equivalent B(1) and eight equivalent C(1) atoms. B(1) is bonded in a distorted trigonal planar geometry to four equivalent Gd(1) and three equivalent C(1) atoms. C(1) is bonded in a 3-coordinate geometry to four equivalent Gd(1) and three equivalent B(1) atoms.
GdB2C2 crystallizes in the tetragonal P4/mbm space group. Gd(1) is bonded in a 16-coordinate geometry to eight equivalent B(1) and eight equivalent C(1) atoms. All Gd(1)-B(1) bond lengths are 2.77 Å. All Gd(1)-C(1) bond lengths are 2.72 Å. B(1) is bonded in a distorted trigonal planar geometry to four equivalent Gd(1) and three equivalent C(1) atoms. There is one shorter (1.52 Å) and two longer (1.60 Å) B(1)-C(1) bond lengths. C(1) is bonded in a 3-coordinate geometry to four equivalent Gd(1) and three equivalent B(1) atoms.