Tc3Os crystallizes in the hexagonal P-6m2 space group. There are two inequivalent Tc sites. In the first Tc site, Tc(1) is bonded to six equivalent Tc(1) and six equivalent Tc(2) atoms to form TcTc12 cuboctahedra that share corners with six equivalent Tc(1)Tc12 cuboctahedra, corners with twelve equivalent Os(1)Tc6Os6 cuboctahedra, edges with six equivalent Tc(1)Tc12 cuboctahedra, edges with twelve equivalent Tc(2)Tc9Os3 cuboctahedra, faces with two equivalent Os(1)Tc6Os6 cuboctahedra, faces with six equivalent Tc(1)Tc12 cuboctahedra, and faces with twelve equivalent Tc(2)Tc9Os3 cuboctahedra. In the second Tc site, Tc(2) is bonded to three equivalent Tc(1), six equivalent Tc(2), and three equivalent Os(1) atoms to form distorted TcTc9Os3 cuboctahedra that share corners with eighteen equivalent Tc(2)Tc9Os3 cuboctahedra, edges with six equivalent Tc(1)Tc12 cuboctahedra, edges with six equivalent Tc(2)Tc9Os3 cuboctahedra, edges with six equivalent Os(1)Tc6Os6 cuboctahedra, faces with six equivalent Tc(1)Tc12 cuboctahedra, faces with six equivalent Os(1)Tc6Os6 cuboctahedra, and faces with eight equivalent Tc(2)Tc9Os3 cuboctahedra. Os(1) is bonded to six equivalent Tc(2) and six equivalent Os(1) atoms to form distorted OsTc6Os6 cuboctahedra that share corners with six equivalent Os(1)Tc6Os6 cuboctahedra, corners with twelve equivalent Tc(1)Tc12 cuboctahedra, edges with six equivalent Os(1)Tc6Os6 cuboctahedra, edges with twelve equivalent Tc(2)Tc9Os3 cuboctahedra, faces with two equivalent Tc(1)Tc12 cuboctahedra, faces with six equivalent Os(1)Tc6Os6 cuboctahedra, and faces with twelve equivalent Tc(2)Tc9Os3 cuboctahedra.
Tc3Os crystallizes in the hexagonal P-6m2 space group. There are two inequivalent Tc sites. In the first Tc site, Tc(1) is bonded to six equivalent Tc(1) and six equivalent Tc(2) atoms to form TcTc12 cuboctahedra that share corners with six equivalent Tc(1)Tc12 cuboctahedra, corners with twelve equivalent Os(1)Tc6Os6 cuboctahedra, edges with six equivalent Tc(1)Tc12 cuboctahedra, edges with twelve equivalent Tc(2)Tc9Os3 cuboctahedra, faces with two equivalent Os(1)Tc6Os6 cuboctahedra, faces with six equivalent Tc(1)Tc12 cuboctahedra, and faces with twelve equivalent Tc(2)Tc9Os3 cuboctahedra. All Tc(1)-Tc(1) bond lengths are 2.74 Å. All Tc(1)-Tc(2) bond lengths are 2.70 Å. In the second Tc site, Tc(2) is bonded to three equivalent Tc(1), six equivalent Tc(2), and three equivalent Os(1) atoms to form distorted TcTc9Os3 cuboctahedra that share corners with eighteen equivalent Tc(2)Tc9Os3 cuboctahedra, edges with six equivalent Tc(1)Tc12 cuboctahedra, edges with six equivalent Tc(2)Tc9Os3 cuboctahedra, edges with six equivalent Os(1)Tc6Os6 cuboctahedra, faces with six equivalent Tc(1)Tc12 cuboctahedra, faces with six equivalent Os(1)Tc6Os6 cuboctahedra, and faces with eight equivalent Tc(2)Tc9Os3 cuboctahedra. All Tc(2)-Tc(2) bond lengths are 2.74 Å. All Tc(2)-Os(1) bond lengths are 2.69 Å. Os(1) is bonded to six equivalent Tc(2) and six equivalent Os(1) atoms to form distorted OsTc6Os6 cuboctahedra that share corners with six equivalent Os(1)Tc6Os6 cuboctahedra, corners with twelve equivalent Tc(1)Tc12 cuboctahedra, edges with six equivalent Os(1)Tc6Os6 cuboctahedra, edges with twelve equivalent Tc(2)Tc9Os3 cuboctahedra, faces with two equivalent Tc(1)Tc12 cuboctahedra, faces with six equivalent Os(1)Tc6Os6 cuboctahedra, and faces with twelve equivalent Tc(2)Tc9Os3 cuboctahedra. All Os(1)-Os(1) bond lengths are 2.74 Å.