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Eu4Ir crystallizes in the tetragonal I4_1/amd space group. The structure is three-dimensional. Eu is bonded in a distorted water-like geometry to two equivalent Ir atoms. There are one shorter (2.86 Å) and one longer (3.24 Å) Eu–Ir bond lengths. Ir is bonded in a 8-coordinate geometry to eight equivalent Eu atoms.
EuIr2 is Cubic Laves structured and crystallizes in the cubic Fd-3m space group. The structure is three-dimensional. Eu is bonded in a 12-coordinate geometry to twelve equivalent Ir atoms. All Eu–Ir bond lengths are 3.18 Å. Ir is bonded to six equivalent Eu and six equivalent Ir atoms to form a mixture of face, edge, and corner-sharing IrEu6Ir6 cuboctahedra. All Ir–Ir bond lengths are 2.71 Å.