Co2GeSi crystallizes in the monoclinic P2_1 space group. There are two inequivalent Co sites. In the first Co site, Co(1) is bonded in a 7-coordinate geometry to three equivalent Ge(1) and four equivalent Si(1) atoms. In the second Co site, Co(2) is bonded in a 7-coordinate geometry to four equivalent Ge(1) and three equivalent Si(1) atoms. Ge(1) is bonded in a 7-coordinate geometry to three equivalent Co(1), four equivalent Co(2), and four equivalent Si(1) atoms. Si(1) is bonded in a 13-coordinate geometry to three equivalent Co(2), four equivalent Co(1), four equivalent Ge(1), and two equivalent Si(1) atoms.
Co2GeSi crystallizes in the monoclinic P2_1 space group. There are two inequivalent Co sites. In the first Co site, Co(1) is bonded in a 7-coordinate geometry to three equivalent Ge(1) and four equivalent Si(1) atoms. There are a spread of Co(1)-Ge(1) bond distances ranging from 2.37-2.49 Å. There are a spread of Co(1)-Si(1) bond distances ranging from 2.35-2.54 Å. In the second Co site, Co(2) is bonded in a 7-coordinate geometry to four equivalent Ge(1) and three equivalent Si(1) atoms. There are a spread of Co(2)-Ge(1) bond distances ranging from 2.37-2.56 Å. There are a spread of Co(2)-Si(1) bond distances ranging from 2.31-2.57 Å. Ge(1) is bonded in a 7-coordinate geometry to three equivalent Co(1), four equivalent Co(2), and four equivalent Si(1) atoms. There are two shorter (2.78 Å) and two longer (2.85 Å) Ge(1)-Si(1) bond lengths. Si(1) is bonded in a 13-coordinate geometry to three equivalent Co(2), four equivalent Co(1), four equivalent Ge(1), and two equivalent Si(1) atoms. Both Si(1)-Si(1) bond lengths are 2.80 Å.