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Be2MnRu crystallizes in the orthorhombic Immm space group. The structure is one-dimensional and consists of two Be2MnRu ribbons oriented in the (1, 0, 0) direction. Be is bonded in a linear geometry to one Mn and one Ru atom. The Be–Mn bond length is 2.41 Å. The Be–Ru bond length is 2.10 Å. Mn is bonded in a linear geometry to two equivalent Be atoms. Ru is bonded in a linear geometry to two equivalent Be atoms.
Be2MnRu is Heusler structured and crystallizes in the cubic Fm-3m space group. The structure is three-dimensional. Be is bonded in a body-centered cubic geometry to four equivalent Mn and four equivalent Ru atoms. All Be–Mn bond lengths are 2.40 Å. All Be–Ru bond lengths are 2.40 Å. Mn is bonded in a 8-coordinate geometry to eight equivalent Be and six equivalent Ru atoms. All Mn–Ru bond lengths are 2.77 Å. Ru is bonded in a distorted body-centered cubic geometry to eight equivalent Be and six equivalent Mn atoms.