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EuIn2 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 In atoms. There are six shorter (3.32 Å) and six longer (3.72 Å) Eu–In bond lengths. In is bonded in a 10-coordinate geometry to six equivalent Eu and four equivalent In atoms. There are three shorter (3.01 Å) and one longer (3.16 Å) In–In bond lengths.
EuIn2(IrGe)4 crystallizes in the tetragonal I-42m space group. The structure is three-dimensional. Eu is bonded in a 12-coordinate geometry to four equivalent Ir, four equivalent In, and eight equivalent Ge atoms. All Eu–Ir bond lengths are 3.51 Å. All Eu–In bond lengths are 3.51 Å. There are four shorter (3.25 Å) and four longer (3.58 Å) Eu–Ge bond lengths. Ir is bonded in a 6-coordinate geometry to one Eu, two equivalent In, and four equivalent Ge atoms. Both Ir–In bond lengths are 2.79 Å. There are a spread of Ir–Ge bond distances ranging from 2.40–2.63 Å. In is bonded in a 10-coordinate geometry to two equivalent Eu, four equivalent Ir, and four equivalent Ge atoms. All In–Ge bond lengths are 3.09 Å. Ge is bonded in a 5-coordinate geometry to two equivalent Eu, four equivalent Ir, and two equivalent In atoms.