TcAl6 crystallizes in the orthorhombic Cmcm space group. Tc(1) is bonded in a distorted q6 geometry to two equivalent Al(2), four equivalent Al(1), and four equivalent Al(3) atoms. There are three inequivalent Al sites. In the first Al site, Al(1) is bonded in a 11-coordinate geometry to two equivalent Tc(1), one Al(1), four equivalent Al(2), and four equivalent Al(3) atoms. In the second Al site, Al(3) is bonded in a distorted bent 150 degrees geometry to two equivalent Tc(1), four equivalent Al(1), and four equivalent Al(2) atoms. In the third Al site, Al(2) is bonded in a 11-coordinate geometry to one Tc(1), two equivalent Al(2), four equivalent Al(1), and four equivalent Al(3) atoms.
TcAl6 crystallizes in the orthorhombic Cmcm space group. Tc(1) is bonded in a distorted q6 geometry to two equivalent Al(2), four equivalent Al(1), and four equivalent Al(3) atoms. Both Tc(1)-Al(2) bond lengths are 2.50 Å. All Tc(1)-Al(1) bond lengths are 2.62 Å. There are two shorter (2.58 Å) and two longer (2.64 Å) Tc(1)-Al(3) bond lengths. There are three inequivalent Al sites. In the first Al site, Al(1) is bonded in a 11-coordinate geometry to two equivalent Tc(1), one Al(1), four equivalent Al(2), and four equivalent Al(3) atoms. The Al(1)-Al(1) bond length is 2.66 Å. There are two shorter (2.76 Å) and two longer (2.88 Å) Al(1)-Al(2) bond lengths. There are two shorter (2.84 Å) and two longer (2.95 Å) Al(1)-Al(3) bond lengths. In the second Al site, Al(3) is bonded in a distorted bent 150 degrees geometry to two equivalent Tc(1), four equivalent Al(1), and four equivalent Al(2) atoms. There are two shorter (2.94 Å) and two longer (2.95 Å) Al(3)-Al(2) bond lengths. In the third Al site, Al(2) is bonded in a 11-coordinate geometry to one Tc(1), two equivalent Al(2), four equivalent Al(1), and four equivalent Al(3) atoms. There is one shorter (2.52 Å) and one longer (2.68 Å) Al(2)-Al(2) bond length.