Y3Co6Sn5 crystallizes in the orthorhombic Immm space group. There are two inequivalent Y sites. In the first Y site, Y(1) is bonded to four equivalent Co(2) and eight equivalent Sn(1) atoms to form distorted YCo4Sn8 cuboctahedra that share edges with two equivalent Sn(2)Y4Co8 cuboctahedra and faces with two equivalent Y(1)Co4Sn8 cuboctahedra. In the second Y site, Y(2) is bonded in a 14-coordinate geometry to two equivalent Co(1), four equivalent Co(2), two equivalent Sn(2), and six equivalent Sn(1) atoms. There are two inequivalent Co sites. In the first Co site, Co(1) is bonded in a 10-coordinate geometry to two equivalent Y(2), four equivalent Co(2), two equivalent Sn(1), and two equivalent Sn(2) atoms. In the second Co site, Co(2) is bonded in a 10-coordinate geometry to one Y(1), two equivalent Y(2), one Co(2), two equivalent Co(1), one Sn(2), and three equivalent Sn(1) atoms. There are two inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a 10-coordinate geometry to two equivalent Y(1), three equivalent Y(2), one Co(1), three equivalent Co(2), and one Sn(1) atom. In the second Sn site, Sn(2) is bonded to four equivalent Y(2), four equivalent Co(1), and four equivalent Co(2) atoms to form SnY4Co8 cuboctahedra that share edges with two equivalent Y(1)Co4Sn8 cuboctahedra and faces with two equivalent Sn(2)Y4Co8 cuboctahedra.
Y3Co6Sn5 crystallizes in the orthorhombic Immm space group. There are two inequivalent Y sites. In the first Y site, Y(1) is bonded to four equivalent Co(2) and eight equivalent Sn(1) atoms to form distorted YCo4Sn8 cuboctahedra that share edges with two equivalent Sn(2)Y4Co8 cuboctahedra and faces with two equivalent Y(1)Co4Sn8 cuboctahedra. All Y(1)-Co(2) bond lengths are 2.96 Å. All Y(1)-Sn(1) bond lengths are 3.43 Å. In the second Y site, Y(2) is bonded in a 14-coordinate geometry to two equivalent Co(1), four equivalent Co(2), two equivalent Sn(2), and six equivalent Sn(1) atoms. Both Y(2)-Co(1) bond lengths are 2.96 Å. All Y(2)-Co(2) bond lengths are 3.21 Å. Both Y(2)-Sn(2) bond lengths are 3.12 Å. There are four shorter (3.16 Å) and two longer (3.30 Å) Y(2)-Sn(1) bond lengths. There are two inequivalent Co sites. In the first Co site, Co(1) is bonded in a 10-coordinate geometry to two equivalent Y(2), four equivalent Co(2), two equivalent Sn(1), and two equivalent Sn(2) atoms. All Co(1)-Co(2) bond lengths are 2.54 Å. Both Co(1)-Sn(1) bond lengths are 2.58 Å. Both Co(1)-Sn(2) bond lengths are 2.88 Å. In the second Co site, Co(2) is bonded in a 10-coordinate geometry to one Y(1), two equivalent Y(2), one Co(2), two equivalent Co(1), one Sn(2), and three equivalent Sn(1) atoms. The Co(2)-Co(2) bond length is 2.65 Å. The Co(2)-Sn(2) bond length is 2.56 Å. There are two shorter (2.57 Å) and one longer (2.74 Å) Co(2)-Sn(1) bond length. There are two inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a 10-coordinate geometry to two equivalent Y(1), three equivalent Y(2), one Co(1), three equivalent Co(2), and one Sn(1) atom. The Sn(1)-Sn(1) bond length is 3.07 Å. In the second Sn site, Sn(2) is bonded to four equivalent Y(2), four equivalent Co(1), and four equivalent Co(2) atoms to form SnY4Co8 cuboctahedra that share edges with two equivalent Y(1)Co4Sn8 cuboctahedra and faces with two equivalent Sn(2)Y4Co8 cuboctahedra.