TmCoAl crystallizes in the orthorhombic Amm2 space group. There are two inequivalent Tm sites. In the first Tm site, Tm(1) is bonded in a 12-coordinate geometry to three equivalent Tm(2), one Co(3), two equivalent Co(1), two equivalent Co(2), three equivalent Al(1), and four equivalent Al(2) atoms. In the second Tm site, Tm(2) is bonded in a 16-coordinate geometry to one Tm(2), three equivalent Tm(1), one Co(1), two equivalent Co(3), four equivalent Co(2), two equivalent Al(2), and three equivalent Al(1) atoms. There are three inequivalent Co sites. In the first Co site, Co(1) is bonded to two equivalent Tm(2), four equivalent Tm(1), two equivalent Al(1), and four equivalent Al(2) atoms to form CoTm6Al6 cuboctahedra that share corners with four equivalent Co(1)Tm6Al6 cuboctahedra, corners with four equivalent Al(1)Tm6Al2Co4 cuboctahedra, edges with two equivalent Co(1)Tm6Al6 cuboctahedra, faces with six equivalent Al(1)Tm6Al2Co4 cuboctahedra, and faces with eight equivalent Al(2)Tm6Al4Co2 cuboctahedra. In the second Co site, Co(2) is bonded in a 12-coordinate geometry to two equivalent Tm(1), four equivalent Tm(2), two equivalent Co(2), two equivalent Co(3), and two equivalent Al(1) atoms. In the third Co site, Co(3) is bonded in a 12-coordinate geometry to two equivalent Tm(1), four equivalent Tm(2), four equivalent Co(2), and two equivalent Al(1) atoms. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded to three equivalent Tm(1), three equivalent Tm(2), one Co(1), one Co(3), two equivalent Co(2), and two equivalent Al(2) atoms to form distorted AlTm6Al2Co4 cuboctahedra that share corners with two equivalent Co(1)Tm6Al6 cuboctahedra, corners with four equivalent Al(2)Tm6Al4Co2 cuboctahedra, edges with six equivalent Al(1)Tm6Al2Co4 cuboctahedra, faces with two equivalent Al(1)Tm6Al2Co4 cuboctahedra, faces with three equivalent Co(1)Tm6Al6 cuboctahedra, and faces with six equivalent Al(2)Tm6Al4Co2 cuboctahedra. In the second Al site, Al(2) is bonded to two equivalent Tm(2), four equivalent Tm(1), two equivalent Co(1), two equivalent Al(1), and two equivalent Al(2) atoms to form distorted AlTm6Al4Co2 cuboctahedra that share corners with four equivalent Al(1)Tm6Al2Co4 cuboctahedra, corners with four equivalent Al(2)Tm6Al4Co2 cuboctahedra, edges with two equivalent Al(2)Tm6Al4Co2 cuboctahedra, faces with four equivalent Co(1)Tm6Al6 cuboctahedra, faces with four equivalent Al(2)Tm6Al4Co2 cuboctahedra, and faces with six equivalent Al(1)Tm6Al2Co4 cuboctahedra.
TmCoAl crystallizes in the orthorhombic Amm2 space group. There are two inequivalent Tm sites. In the first Tm site, Tm(1) is bonded in a 12-coordinate geometry to three equivalent Tm(2), one Co(3), two equivalent Co(1), two equivalent Co(2), three equivalent Al(1), and four equivalent Al(2) atoms. There are two shorter (3.23 Å) and one longer (3.24 Å) Tm(1)-Tm(2) bond length. The Tm(1)-Co(3) bond length is 2.88 Å. Both Tm(1)-Co(1) bond lengths are 3.18 Å. Both Tm(1)-Co(2) bond lengths are 2.87 Å. There are two shorter (3.12 Å) and one longer (3.13 Å) Tm(1)-Al(1) bond length. There are two shorter (3.13 Å) and two longer (3.17 Å) Tm(1)-Al(2) bond lengths. In the second Tm site, Tm(2) is bonded in a 16-coordinate geometry to one Tm(2), three equivalent Tm(1), one Co(1), two equivalent Co(3), four equivalent Co(2), two equivalent Al(2), and three equivalent Al(1) atoms. The Tm(2)-Tm(2) bond length is 2.94 Å. The Tm(2)-Co(1) bond length is 3.10 Å. Both Tm(2)-Co(3) bond lengths are 3.06 Å. There are two shorter (2.99 Å) and two longer (3.07 Å) Tm(2)-Co(2) bond lengths. Both Tm(2)-Al(2) bond lengths are 3.12 Å. There is one shorter (3.01 Å) and two longer (3.15 Å) Tm(2)-Al(1) bond lengths. There are three inequivalent Co sites. In the first Co site, Co(1) is bonded to two equivalent Tm(2), four equivalent Tm(1), two equivalent Al(1), and four equivalent Al(2) atoms to form CoTm6Al6 cuboctahedra that share corners with four equivalent Co(1)Tm6Al6 cuboctahedra, corners with four equivalent Al(1)Tm6Al2Co4 cuboctahedra, edges with two equivalent Co(1)Tm6Al6 cuboctahedra, faces with six equivalent Al(1)Tm6Al2Co4 cuboctahedra, and faces with eight equivalent Al(2)Tm6Al4Co2 cuboctahedra. Both Co(1)-Al(1) bond lengths are 2.71 Å. There are two shorter (2.61 Å) and two longer (2.68 Å) Co(1)-Al(2) bond lengths. In the second Co site, Co(2) is bonded in a 12-coordinate geometry to two equivalent Tm(1), four equivalent Tm(2), two equivalent Co(2), two equivalent Co(3), and two equivalent Al(1) atoms. There is one shorter (2.52 Å) and one longer (2.85 Å) Co(2)-Co(2) bond length. There is one shorter (2.49 Å) and one longer (2.81 Å) Co(2)-Co(3) bond length. Both Co(2)-Al(1) bond lengths are 2.52 Å. In the third Co site, Co(3) is bonded in a 12-coordinate geometry to two equivalent Tm(1), four equivalent Tm(2), four equivalent Co(2), and two equivalent Al(1) atoms. Both Co(3)-Al(1) bond lengths are 2.52 Å. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded to three equivalent Tm(1), three equivalent Tm(2), one Co(1), one Co(3), two equivalent Co(2), and two equivalent Al(2) atoms to form distorted AlTm6Al2Co4 cuboctahedra that share corners with two equivalent Co(1)Tm6Al6 cuboctahedra, corners with four equivalent Al(2)Tm6Al4Co2 cuboctahedra, edges with six equivalent Al(1)Tm6Al2Co4 cuboctahedra, faces with two equivalent Al(1)Tm6Al2Co4 cuboctahedra, faces with three equivalent Co(1)Tm6Al6 cuboctahedra, and faces with six equivalent Al(2)Tm6Al4Co2 cuboctahedra. Both Al(1)-Al(2) bond lengths are 2.77 Å. In the second Al site, Al(2) is bonded to two equivalent Tm(2), four equivalent Tm(1), two equivalent Co(1), two equivalent Al(1), and two equivalent Al(2) atoms to form distorted AlTm6Al4Co2 cuboctahedra that share corners with four equivalent Al(1)Tm6Al2Co4 cuboctahedra, corners with four equivalent Al(2)Tm6Al4Co2 cuboctahedra, edges with two equivalent Al(2)Tm6Al4Co2 cuboctahedra, faces with four equivalent Co(1)Tm6Al6 cuboctahedra, faces with four equivalent Al(2)Tm6Al4Co2 cuboctahedra, and faces with six equivalent Al(1)Tm6Al2Co4 cuboctahedra. There is one shorter (2.65 Å) and one longer (2.71 Å) Al(2)-Al(2) bond length.