B13C2 crystallizes in the trigonal R-3m space group. There are three inequivalent B sites. In the first B site, B(1) is bonded in a linear geometry to two equivalent C(1) atoms. In the second B site, B(2) is bonded in a single-bond geometry to three equivalent B(3) and one C(1) atom. In the third B site, B(3) is bonded in a 6-coordinate geometry to three equivalent B(2) and three equivalent B(3) atoms. C(1) is bonded to one B(1) and three equivalent B(2) atoms to form corner-sharing CB4 trigonal pyramids.
B13C2 crystallizes in the trigonal R-3m space group. There are three inequivalent B sites. In the first B site, B(1) is bonded in a linear geometry to two equivalent C(1) atoms. Both B(1)-C(1) bond lengths are 1.44 Å. In the second B site, B(2) is bonded in a single-bond geometry to three equivalent B(3) and one C(1) atom. There is one shorter (1.79 Å) and two longer (1.81 Å) B(2)-B(3) bond lengths. The B(2)-C(1) bond length is 1.61 Å. In the third B site, B(3) is bonded in a 6-coordinate geometry to three equivalent B(2) and three equivalent B(3) atoms. There is one shorter (1.76 Å) and two longer (1.79 Å) B(3)-B(3) bond lengths. C(1) is bonded to one B(1) and three equivalent B(2) atoms to form corner-sharing CB4 trigonal pyramids.