La4Co2Sn5 crystallizes in the monoclinic C2/m space group. There are two inequivalent La sites. In the first La site, La(1) is bonded in a 10-coordinate geometry to two equivalent Co(1), one Sn(3), three equivalent Sn(1), and four equivalent Sn(2) atoms. In the second La site, La(2) is bonded in a 9-coordinate geometry to two equivalent Co(1), two equivalent Sn(1), two equivalent Sn(3), and three equivalent Sn(2) atoms. Co(1) is bonded in a 9-coordinate geometry to two equivalent La(1), two equivalent La(2), one Sn(2), one Sn(3), and three equivalent Sn(1) atoms. There are three inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a 8-coordinate geometry to two equivalent La(2), three equivalent La(1), three equivalent Co(1), and two equivalent Sn(3) atoms. In the second Sn site, Sn(2) is bonded in a 9-coordinate geometry to three equivalent La(2), four equivalent La(1), one Co(1), and one Sn(2) atom. In the third Sn site, Sn(3) is bonded in a 12-coordinate geometry to two equivalent La(1), four equivalent La(2), two equivalent Co(1), and four equivalent Sn(1) atoms.
La4Co2Sn5 crystallizes in the monoclinic C2/m space group. There are two inequivalent La sites. In the first La site, La(1) is bonded in a 10-coordinate geometry to two equivalent Co(1), one Sn(3), three equivalent Sn(1), and four equivalent Sn(2) atoms. Both La(1)-Co(1) bond lengths are 3.33 Å. The La(1)-Sn(3) bond length is 3.72 Å. There are two shorter (3.26 Å) and one longer (3.30 Å) La(1)-Sn(1) bond length. There are two shorter (3.42 Å) and two longer (3.47 Å) La(1)-Sn(2) bond lengths. In the second La site, La(2) is bonded in a 9-coordinate geometry to two equivalent Co(1), two equivalent Sn(1), two equivalent Sn(3), and three equivalent Sn(2) atoms. Both La(2)-Co(1) bond lengths are 3.21 Å. There is one shorter (3.29 Å) and one longer (3.63 Å) La(2)-Sn(1) bond length. Both La(2)-Sn(3) bond lengths are 3.44 Å. There are two shorter (3.27 Å) and one longer (3.46 Å) La(2)-Sn(2) bond length. Co(1) is bonded in a 9-coordinate geometry to two equivalent La(1), two equivalent La(2), one Sn(2), one Sn(3), and three equivalent Sn(1) atoms. The Co(1)-Sn(2) bond length is 2.64 Å. The Co(1)-Sn(3) bond length is 2.60 Å. All Co(1)-Sn(1) bond lengths are 2.73 Å. There are three inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a 8-coordinate geometry to two equivalent La(2), three equivalent La(1), three equivalent Co(1), and two equivalent Sn(3) atoms. Both Sn(1)-Sn(3) bond lengths are 3.31 Å. In the second Sn site, Sn(2) is bonded in a 9-coordinate geometry to three equivalent La(2), four equivalent La(1), one Co(1), and one Sn(2) atom. The Sn(2)-Sn(2) bond length is 3.01 Å. In the third Sn site, Sn(3) is bonded in a 12-coordinate geometry to two equivalent La(1), four equivalent La(2), two equivalent Co(1), and four equivalent Sn(1) atoms.