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EuTl2 crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Eu is bonded in a 12-coordinate geometry to twelve equivalent Tl atoms. There are six shorter (3.41 Å) and six longer (3.83 Å) Eu–Tl bond lengths. Tl is bonded in a 10-coordinate geometry to six equivalent Eu and four equivalent Tl atoms. There are three shorter (3.08 Å) and one longer (3.29 Å) Tl–Tl bond lengths.
EuTl is Tetraauricupride structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Eu is bonded in a body-centered cubic geometry to eight equivalent Tl atoms. All Eu–Tl bond lengths are 3.91 Å. Tl is bonded in a body-centered cubic geometry to eight equivalent Eu atoms.
Eu3Tl is beta Cu3Ti-like structured and crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Eu is bonded to eight equivalent Eu and four equivalent Tl atoms to form distorted EuEu8Tl4 cuboctahedra that share corners with four equivalent TlEu12 cuboctahedra, corners with fourteen equivalent EuEu8Tl4 cuboctahedra, edges with six equivalent TlEu12 cuboctahedra, edges with twelve equivalent EuEu8Tl4 cuboctahedra, faces with four equivalent TlEu12 cuboctahedra, and faces with sixteen equivalent EuEu8Tl4 cuboctahedra. There are a spread of Eu–Eu bond distances ranging from 3.51–3.90 Å. There are two shorter (3.52 Å) and two longer (3.70 Å) Eu–Tl bond lengths. Tl is bonded to twelve equivalent Eu atoms to form TlEu12 cuboctahedra that share corners with six equivalent TlEu12 cuboctahedra, corners with twelve equivalent EuEu8Tl4 cuboctahedra, edges with eighteen equivalent EuEu8Tl4 cuboctahedra, faces with eight equivalent TlEu12 cuboctahedra, and faces with twelve equivalent EuEu8Tl4 cuboctahedra.
EuTl3 is Uranium Silicide structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Eu is bonded to twelve equivalent Tl atoms to form EuTl12 cuboctahedra that share corners with twelve equivalent EuTl12 cuboctahedra, edges with twenty-four equivalent TlEu4Tl8 cuboctahedra, faces with six equivalent EuTl12 cuboctahedra, and faces with twelve equivalent TlEu4Tl8 cuboctahedra. All Eu–Tl bond lengths are 3.50 Å. Tl is bonded to four equivalent Eu and eight equivalent Tl atoms to form distorted TlEu4Tl8 cuboctahedra that share corners with twelve equivalent TlEu4Tl8 cuboctahedra, edges with eight equivalent EuTl12 cuboctahedra, edges with sixteen equivalent TlEu4Tl8 cuboctahedra, faces with four equivalent EuTl12 cuboctahedra, and faces with fourteen equivalent TlEu4Tl8 cuboctahedra. All Tl–Tl bond lengths are 3.50 Å.
EuTl3 crystallizes in the orthorhombic Cmcm space group. The structure is three-dimensional. Eu is bonded to twelve Tl atoms to form a mixture of corner and face-sharing EuTl12 cuboctahedra. There are a spread of Eu–Tl bond distances ranging from 3.44–3.64 Å. There are two inequivalent Tl sites. In the first Tl site, Tl is bonded in a 4-coordinate geometry to four equivalent Eu atoms. In the second Tl site, Tl is bonded in a 4-coordinate geometry to four equivalent Eu atoms.