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Rh2ZnGe crystallizes in the orthorhombic Immm space group. The structure is one-dimensional and consists of two Rh2ZnGe ribbons oriented in the (1, 0, 0) direction. Rh is bonded in a linear geometry to one Zn and one Ge atom. The Rh–Zn bond length is 2.54 Å. The Rh–Ge bond length is 2.22 Å. Zn is bonded in a linear geometry to two equivalent Rh atoms. Ge is bonded in a linear geometry to two equivalent Rh atoms.
Rh2ZnGe is Heusler structured and crystallizes in the cubic Fm-3m space group. The structure is three-dimensional. Rh is bonded in a body-centered cubic geometry to four equivalent Zn and four equivalent Ge atoms. All Rh–Zn bond lengths are 2.64 Å. All Rh–Ge bond lengths are 2.64 Å. Zn is bonded in a body-centered cubic geometry to eight equivalent Rh atoms. Ge is bonded in a body-centered cubic geometry to eight equivalent Rh atoms.