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DyTl is Tetraauricupride structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Dy is bonded in a body-centered cubic geometry to eight equivalent Tl atoms. All Dy–Tl bond lengths are 3.29 Å. Tl is bonded in a body-centered cubic geometry to eight equivalent Dy atoms.
DyTl3 is Uranium Silicide structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Dy is bonded to twelve equivalent Tl atoms to form DyTl12 cuboctahedra that share corners with twelve equivalent DyTl12 cuboctahedra, edges with twenty-four equivalent TlDy4Tl8 cuboctahedra, faces with six equivalent DyTl12 cuboctahedra, and faces with twelve equivalent TlDy4Tl8 cuboctahedra. All Dy–Tl bond lengths are 3.38 Å. Tl is bonded to four equivalent Dy and eight equivalent Tl atoms to form distorted TlDy4Tl8 cuboctahedra that share corners with twelve equivalent TlDy4Tl8 cuboctahedra, edges with eight equivalent DyTl12 cuboctahedra, edges with sixteen equivalent TlDy4Tl8 cuboctahedra, faces with four equivalent DyTl12 cuboctahedra, and faces with fourteen equivalent TlDy4Tl8 cuboctahedra. All Tl–Tl bond lengths are 3.38 Å.
Dy2Tl crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. there are two inequivalent Dy sites. In the first Dy site, Dy is bonded in a 6-coordinate geometry to eight Dy and six equivalent Tl atoms. There are two shorter (3.37 Å) and six longer (3.55 Å) Dy–Dy bond lengths. All Dy–Tl bond lengths are 3.55 Å. In the second Dy site, Dy is bonded to six equivalent Dy and five equivalent Tl atoms to form a mixture of distorted corner and face-sharing DyDy6Tl5 trigonal bipyramids. There are three shorter (3.13 Å) and two longer (3.37 Å) Dy–Tl bond lengths. Tl is bonded in a 11-coordinate geometry to eleven Dy atoms.
Dy5Tl3 crystallizes in the hexagonal P6_3/mcm space group. The structure is three-dimensional. there are two inequivalent Dy sites. In the first Dy site, Dy is bonded in a 6-coordinate geometry to six equivalent Tl atoms. All Dy–Tl bond lengths are 3.22 Å. In the second Dy site, Dy is bonded in a 3-coordinate geometry to five equivalent Tl atoms. There are a spread of Dy–Tl bond distances ranging from 3.15–3.69 Å. Tl is bonded in a 9-coordinate geometry to nine Dy atoms.