Tm(MnAl2)4 crystallizes in the tetragonal I4/mmm space group. Tm(1) is bonded in a 20-coordinate geometry to eight equivalent Mn(1), four equivalent Al(1), and eight equivalent Al(2) atoms. Mn(1) is bonded in a 12-coordinate geometry to two equivalent Tm(1), two equivalent Mn(1), four equivalent Al(1), and four equivalent Al(2) atoms. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded in a 10-coordinate geometry to one Tm(1), four equivalent Mn(1), one Al(1), and four equivalent Al(2) atoms. In the second Al site, Al(2) is bonded in a 12-coordinate geometry to two equivalent Tm(1), four equivalent Mn(1), two equivalent Al(2), and four equivalent Al(1) atoms.
Tm(MnAl2)4 crystallizes in the tetragonal I4/mmm space group. Tm(1) is bonded in a 20-coordinate geometry to eight equivalent Mn(1), four equivalent Al(1), and eight equivalent Al(2) atoms. All Tm(1)-Mn(1) bond lengths are 3.35 Å. All Tm(1)-Al(1) bond lengths are 2.94 Å. All Tm(1)-Al(2) bond lengths are 3.23 Å. Mn(1) is bonded in a 12-coordinate geometry to two equivalent Tm(1), two equivalent Mn(1), four equivalent Al(1), and four equivalent Al(2) atoms. Both Mn(1)-Mn(1) bond lengths are 2.57 Å. All Mn(1)-Al(1) bond lengths are 2.64 Å. All Mn(1)-Al(2) bond lengths are 2.55 Å. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded in a 10-coordinate geometry to one Tm(1), four equivalent Mn(1), one Al(1), and four equivalent Al(2) atoms. The Al(1)-Al(1) bond length is 2.87 Å. There are two shorter (2.75 Å) and two longer (2.81 Å) Al(1)-Al(2) bond lengths. In the second Al site, Al(2) is bonded in a 12-coordinate geometry to two equivalent Tm(1), four equivalent Mn(1), two equivalent Al(2), and four equivalent Al(1) atoms. Both Al(2)-Al(2) bond lengths are 2.76 Å.