Sm3Ru2Ge4 crystallizes in the monoclinic C2/m space group. There are two inequivalent Sm sites. In the first Sm site, Sm(1) is bonded in a 8-coordinate geometry to two equivalent Ge(2) and six equivalent Ge(1) atoms. In the second Sm site, Sm(2) is bonded in a 11-coordinate geometry to four equivalent Ru(1), three equivalent Ge(1), and four equivalent Ge(2) atoms. Ru(1) is bonded in a 8-coordinate geometry to four equivalent Sm(2), one Ge(1), and three equivalent Ge(2) atoms. There are two inequivalent Ge sites. In the first Ge site, Ge(1) is bonded in a 9-coordinate geometry to three equivalent Sm(1), three equivalent Sm(2), one Ru(1), and two equivalent Ge(1) atoms. In the second Ge site, Ge(2) is bonded in a 8-coordinate geometry to one Sm(1), four equivalent Sm(2), and three equivalent Ru(1) atoms.
Sm3Ru2Ge4 crystallizes in the monoclinic C2/m space group. There are two inequivalent Sm sites. In the first Sm site, Sm(1) is bonded in a 8-coordinate geometry to two equivalent Ge(2) and six equivalent Ge(1) atoms. Both Sm(1)-Ge(2) bond lengths are 3.15 Å. There are four shorter (3.09 Å) and two longer (3.42 Å) Sm(1)-Ge(1) bond lengths. In the second Sm site, Sm(2) is bonded in a 11-coordinate geometry to four equivalent Ru(1), three equivalent Ge(1), and four equivalent Ge(2) atoms. There are a spread of Sm(2)-Ru(1) bond distances ranging from 3.08-3.22 Å. There is one shorter (3.00 Å) and two longer (3.04 Å) Sm(2)-Ge(1) bond lengths. There are two shorter (3.15 Å) and two longer (3.21 Å) Sm(2)-Ge(2) bond lengths. Ru(1) is bonded in a 8-coordinate geometry to four equivalent Sm(2), one Ge(1), and three equivalent Ge(2) atoms. The Ru(1)-Ge(1) bond length is 2.44 Å. There are two shorter (2.43 Å) and one longer (2.51 Å) Ru(1)-Ge(2) bond length. There are two inequivalent Ge sites. In the first Ge site, Ge(1) is bonded in a 9-coordinate geometry to three equivalent Sm(1), three equivalent Sm(2), one Ru(1), and two equivalent Ge(1) atoms. Both Ge(1)-Ge(1) bond lengths are 2.81 Å. In the second Ge site, Ge(2) is bonded in a 8-coordinate geometry to one Sm(1), four equivalent Sm(2), and three equivalent Ru(1) atoms.