Be(B6C)2 crystallizes in the trigonal R-3m space group. Be(1) is bonded in a linear geometry to two equivalent C(1) atoms. There are two inequivalent B sites. In the first B site, B(2) is bonded in a 6-coordinate geometry to three equivalent B(1) and three equivalent B(2) atoms. In the second B site, B(1) is bonded in a single-bond geometry to three equivalent B(2) and one C(1) atom. C(1) is bonded to one Be(1) and three equivalent B(1) atoms to form corner-sharing CBeB3 trigonal pyramids.
Be(B6C)2 crystallizes in the trigonal R-3m space group. Be(1) is bonded in a linear geometry to two equivalent C(1) atoms. Both Be(1)-C(1) bond lengths are 1.67 Å. There are two inequivalent B sites. In the first B site, B(2) is bonded in a 6-coordinate geometry to three equivalent B(1) and three equivalent B(2) atoms. There is one shorter (1.80 Å) and two longer (1.83 Å) B(2)-B(1) bond lengths. There is one shorter (1.73 Å) and two longer (1.85 Å) B(2)-B(2) bond lengths. In the second B site, B(1) is bonded in a single-bond geometry to three equivalent B(2) and one C(1) atom. The B(1)-C(1) bond length is 1.56 Å. C(1) is bonded to one Be(1) and three equivalent B(1) atoms to form corner-sharing CBeB3 trigonal pyramids.