Sm2RuGe2 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 Ru(1), one Ge(2), and five equivalent Ge(1) atoms. In the second Sm site, Sm(2) is bonded in a 10-coordinate geometry to four equivalent Ru(1), two equivalent Ge(1), and five equivalent Ge(2) atoms. Ru(1) is bonded in a 10-coordinate geometry to two equivalent Sm(1), 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 two equivalent Sm(2), five equivalent Sm(1), one Ru(1), and one Ge(1) atom. In the second Ge site, Ge(2) is bonded in a 10-coordinate geometry to one Sm(1), five equivalent Sm(2), three equivalent Ru(1), and one Ge(2) atom.
Sm2RuGe2 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 Ru(1), one Ge(2), and five equivalent Ge(1) atoms. Both Sm(1)-Ru(1) bond lengths are 3.36 Å. The Sm(1)-Ge(2) bond length is 2.95 Å. There are a spread of Sm(1)-Ge(1) bond distances ranging from 3.08-3.33 Å. In the second Sm site, Sm(2) is bonded in a 10-coordinate geometry to four equivalent Ru(1), two equivalent Ge(1), and five equivalent Ge(2) atoms. There are a spread of Sm(2)-Ru(1) bond distances ranging from 3.11-3.27 Å. Both Sm(2)-Ge(1) bond lengths are 2.99 Å. There are a spread of Sm(2)-Ge(2) bond distances ranging from 3.11-3.45 Å. Ru(1) is bonded in a 10-coordinate geometry to two equivalent Sm(1), four equivalent Sm(2), one Ge(1), and three equivalent Ge(2) atoms. The Ru(1)-Ge(1) bond length is 2.61 Å. There are two shorter (2.45 Å) and one longer (2.50 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 two equivalent Sm(2), five equivalent Sm(1), one Ru(1), and one Ge(1) atom. The Ge(1)-Ge(1) bond length is 2.70 Å. In the second Ge site, Ge(2) is bonded in a 10-coordinate geometry to one Sm(1), five equivalent Sm(2), three equivalent Ru(1), and one Ge(2) atom. The Ge(2)-Ge(2) bond length is 2.94 Å.