LaRuSi2 crystallizes in the monoclinic P2_1/m space group. La(1) is bonded in a 11-coordinate geometry to two equivalent Ru(1), three equivalent Si(1), and six equivalent Si(2) atoms. Ru(1) is bonded in a 5-coordinate geometry to two equivalent La(1), one Si(2), and four equivalent Si(1) atoms. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded in a 9-coordinate geometry to three equivalent La(1), four equivalent Ru(1), and two equivalent Si(1) atoms. In the second Si site, Si(2) is bonded in a 9-coordinate geometry to six equivalent La(1), one Ru(1), and two equivalent Si(2) atoms.
LaRuSi2 crystallizes in the monoclinic P2_1/m space group. La(1) is bonded in a 11-coordinate geometry to two equivalent Ru(1), three equivalent Si(1), and six equivalent Si(2) atoms. Both La(1)-Ru(1) bond lengths are 3.29 Å. There is one shorter (3.05 Å) and two longer (3.16 Å) La(1)-Si(1) bond lengths. There are a spread of La(1)-Si(2) bond distances ranging from 3.16-3.34 Å. Ru(1) is bonded in a 5-coordinate geometry to two equivalent La(1), one Si(2), and four equivalent Si(1) atoms. The Ru(1)-Si(2) bond length is 2.44 Å. There are three shorter (2.39 Å) and one longer (2.46 Å) Ru(1)-Si(1) bond length. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded in a 9-coordinate geometry to three equivalent La(1), four equivalent Ru(1), and two equivalent Si(1) atoms. Both Si(1)-Si(1) bond lengths are 2.59 Å. In the second Si site, Si(2) is bonded in a 9-coordinate geometry to six equivalent La(1), one Ru(1), and two equivalent Si(2) atoms. Both Si(2)-Si(2) bond lengths are 2.55 Å.