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YGe crystallizes in the orthorhombic Cmcm space group. The structure is three-dimensional. Y is bonded in a 5-coordinate geometry to seven equivalent Ge atoms. There are five shorter (2.98 Å) and two longer (3.23 Å) Y–Ge bond lengths. Ge is bonded in a 5-coordinate geometry to seven equivalent Y and two equivalent Ge atoms. Both Ge–Ge bond lengths are 2.70 Å.
Li(YGe)4 is delta Molybdenum Boride-derived structured and crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. Li is bonded in a distorted T-shaped geometry to five Ge atoms. There are a spread of Li–Ge bond distances ranging from 2.71–3.17 Å. There are two inequivalent Y sites. In the first Y site, Y is bonded in a 6-coordinate geometry to six Ge atoms. There are a spread of Y–Ge bond distances ranging from 2.87–3.04 Å. In the second Y site, Y is bonded in a 7-coordinate geometry to seven Ge atoms. There are a spread of Y–Ge bond distances ranging from 2.99–3.40 Å. There are three inequivalent Ge sites. In the first Ge site, Ge is bonded in a 8-coordinate geometry to one Li, six Y, and one Ge atom. The Ge–Ge bond length is 2.57 Å. In the second Ge site, Ge is bonded in a 9-coordinate geometry to two equivalent Li, six Y, and one Ge atom. In the third Ge site, Ge is bonded in a 9-coordinate geometry to one Li, seven Y, and one Ge atom. The Ge–Ge bond length is 2.68 Å.