TmDyMn4 is Hexagonal Laves-derived structured and crystallizes in the trigonal P-3m1 space group. Tm(1) is bonded in a 16-coordinate geometry to three equivalent Tm(1), one Dy(1), three equivalent Mn(2), and nine equivalent Mn(3) atoms. Dy(1) is bonded in a 16-coordinate geometry to one Tm(1), three equivalent Dy(1), three equivalent Mn(1), and nine equivalent Mn(3) atoms. There are three inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to six equivalent Dy(1) and six equivalent Mn(3) atoms to form MnDy6Mn6 cuboctahedra that share corners with twelve equivalent Mn(3)Dy3Tm3Mn6 cuboctahedra, edges with six equivalent Mn(1)Dy6Mn6 cuboctahedra, faces with two equivalent Mn(2)Tm6Mn6 cuboctahedra, and faces with eighteen equivalent Mn(3)Dy3Tm3Mn6 cuboctahedra. In the second Mn site, Mn(2) is bonded to six equivalent Tm(1) and six equivalent Mn(3) atoms to form MnTm6Mn6 cuboctahedra that share corners with twelve equivalent Mn(3)Dy3Tm3Mn6 cuboctahedra, edges with six equivalent Mn(2)Tm6Mn6 cuboctahedra, faces with two equivalent Mn(1)Dy6Mn6 cuboctahedra, and faces with eighteen equivalent Mn(3)Dy3Tm3Mn6 cuboctahedra. In the third Mn site, Mn(3) is bonded to three equivalent Tm(1), three equivalent Dy(1), one Mn(1), one Mn(2), and four equivalent Mn(3) atoms to form MnDy3Tm3Mn6 cuboctahedra that share corners with two equivalent Mn(1)Dy6Mn6 cuboctahedra, corners with two equivalent Mn(2)Tm6Mn6 cuboctahedra, corners with fourteen equivalent Mn(3)Dy3Tm3Mn6 cuboctahedra, edges with six equivalent Mn(3)Dy3Tm3Mn6 cuboctahedra, faces with three equivalent Mn(1)Dy6Mn6 cuboctahedra, faces with three equivalent Mn(2)Tm6Mn6 cuboctahedra, and faces with twelve equivalent Mn(3)Dy3Tm3Mn6 cuboctahedra.
TmDyMn4 is Hexagonal Laves-derived structured and crystallizes in the trigonal P-3m1 space group. Tm(1) is bonded in a 16-coordinate geometry to three equivalent Tm(1), one Dy(1), three equivalent Mn(2), and nine equivalent Mn(3) atoms. All Tm(1)-Tm(1) bond lengths are 3.12 Å. The Tm(1)-Dy(1) bond length is 3.13 Å. All Tm(1)-Mn(2) bond lengths are 2.98 Å. There are three shorter (2.97 Å) and six longer (2.98 Å) Tm(1)-Mn(3) bond lengths. Dy(1) is bonded in a 16-coordinate geometry to one Tm(1), three equivalent Dy(1), three equivalent Mn(1), and nine equivalent Mn(3) atoms. All Dy(1)-Dy(1) bond lengths are 3.12 Å. All Dy(1)-Mn(1) bond lengths are 2.99 Å. There are six shorter (3.00 Å) and three longer (3.01 Å) Dy(1)-Mn(3) bond lengths. There are three inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to six equivalent Dy(1) and six equivalent Mn(3) atoms to form MnDy6Mn6 cuboctahedra that share corners with twelve equivalent Mn(3)Dy3Tm3Mn6 cuboctahedra, edges with six equivalent Mn(1)Dy6Mn6 cuboctahedra, faces with two equivalent Mn(2)Tm6Mn6 cuboctahedra, and faces with eighteen equivalent Mn(3)Dy3Tm3Mn6 cuboctahedra. All Mn(1)-Mn(3) bond lengths are 2.58 Å. In the second Mn site, Mn(2) is bonded to six equivalent Tm(1) and six equivalent Mn(3) atoms to form MnTm6Mn6 cuboctahedra that share corners with twelve equivalent Mn(3)Dy3Tm3Mn6 cuboctahedra, edges with six equivalent Mn(2)Tm6Mn6 cuboctahedra, faces with two equivalent Mn(1)Dy6Mn6 cuboctahedra, and faces with eighteen equivalent Mn(3)Dy3Tm3Mn6 cuboctahedra. All Mn(2)-Mn(3) bond lengths are 2.55 Å. In the third Mn site, Mn(3) is bonded to three equivalent Tm(1), three equivalent Dy(1), one Mn(1), one Mn(2), and four equivalent Mn(3) atoms to form MnDy3Tm3Mn6 cuboctahedra that share corners with two equivalent Mn(1)Dy6Mn6 cuboctahedra, corners with two equivalent Mn(2)Tm6Mn6 cuboctahedra, corners with fourteen equivalent Mn(3)Dy3Tm3Mn6 cuboctahedra, edges with six equivalent Mn(3)Dy3Tm3Mn6 cuboctahedra, faces with three equivalent Mn(1)Dy6Mn6 cuboctahedra, faces with three equivalent Mn(2)Tm6Mn6 cuboctahedra, and faces with twelve equivalent Mn(3)Dy3Tm3Mn6 cuboctahedra. There are two shorter (2.52 Å) and two longer (2.57 Å) Mn(3)-Mn(3) bond lengths.