TmB2C crystallizes in the tetragonal P4_2/mbc space group. Tm(1) is bonded in a 14-coordinate geometry to four equivalent B(1), six equivalent B(2), and four equivalent C(1) atoms. There are two inequivalent B sites. In the first B site, B(1) is bonded in a distorted water-like geometry to four equivalent Tm(1) and two equivalent C(1) atoms. In the second B site, B(2) is bonded in a distorted single-bond geometry to six equivalent Tm(1) and one C(1) atom. C(1) is bonded in a 3-coordinate geometry to four equivalent Tm(1), one B(2), and two equivalent B(1) atoms.
TmB2C crystallizes in the tetragonal P4_2/mbc space group. Tm(1) is bonded in a 14-coordinate geometry to four equivalent B(1), six equivalent B(2), and four equivalent C(1) atoms. There are two shorter (2.59 Å) and two longer (2.61 Å) Tm(1)-B(1) bond lengths. There are a spread of Tm(1)-B(2) bond distances ranging from 2.72-2.74 Å. There are two shorter (2.55 Å) and two longer (2.57 Å) Tm(1)-C(1) bond lengths. There are two inequivalent B sites. In the first B site, B(1) is bonded in a distorted water-like geometry to four equivalent Tm(1) and two equivalent C(1) atoms. Both B(1)-C(1) bond lengths are 1.62 Å. In the second B site, B(2) is bonded in a distorted single-bond geometry to six equivalent Tm(1) and one C(1) atom. The B(2)-C(1) bond length is 1.59 Å. C(1) is bonded in a 3-coordinate geometry to four equivalent Tm(1), one B(2), and two equivalent B(1) atoms.