Pr3(CuSn)4 crystallizes in the orthorhombic Immm space group. There are two inequivalent Pr sites. In the first Pr site, Pr(1) is bonded to two equivalent Sn(2) and four equivalent Sn(1) atoms to form distorted edge-sharing PrSn6 octahedra. In the second Pr site, Pr(2) is bonded in a 12-coordinate geometry to six equivalent Cu(1), two equivalent Sn(2), and four equivalent Sn(1) atoms. Cu(1) is bonded in a 8-coordinate geometry to three equivalent Pr(2), one Cu(1), one Sn(1), and three equivalent Sn(2) atoms. There are two inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a 9-coordinate geometry to two equivalent Pr(1), four equivalent Pr(2), two equivalent Cu(1), and one Sn(1) atom. In the second Sn site, Sn(2) is bonded in a 9-coordinate geometry to one Pr(1), two equivalent Pr(2), and six equivalent Cu(1) atoms.
Pr3(CuSn)4 crystallizes in the orthorhombic Immm space group. There are two inequivalent Pr sites. In the first Pr site, Pr(1) is bonded to two equivalent Sn(2) and four equivalent Sn(1) atoms to form distorted edge-sharing PrSn6 octahedra. Both Pr(1)-Sn(2) bond lengths are 3.27 Å. All Pr(1)-Sn(1) bond lengths are 3.12 Å. In the second Pr site, Pr(2) is bonded in a 12-coordinate geometry to six equivalent Cu(1), two equivalent Sn(2), and four equivalent Sn(1) atoms. There are four shorter (3.24 Å) and two longer (3.27 Å) Pr(2)-Cu(1) bond lengths. Both Pr(2)-Sn(2) bond lengths are 3.22 Å. All Pr(2)-Sn(1) bond lengths are 3.37 Å. Cu(1) is bonded in a 8-coordinate geometry to three equivalent Pr(2), one Cu(1), one Sn(1), and three equivalent Sn(2) atoms. The Cu(1)-Cu(1) bond length is 2.55 Å. The Cu(1)-Sn(1) bond length is 2.66 Å. There are two shorter (2.73 Å) and one longer (2.85 Å) Cu(1)-Sn(2) bond length. There are two inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a 9-coordinate geometry to two equivalent Pr(1), four equivalent Pr(2), two equivalent Cu(1), and one Sn(1) atom. The Sn(1)-Sn(1) bond length is 2.80 Å. In the second Sn site, Sn(2) is bonded in a 9-coordinate geometry to one Pr(1), two equivalent Pr(2), and six equivalent Cu(1) atoms.