Pr3Ni2Sn7 crystallizes in the orthorhombic Cmmm space group. There are two inequivalent Pr sites. In the first Pr site, Pr(1) is bonded in a square co-planar geometry to two equivalent Sn(1) and two equivalent Sn(3) atoms. In the second Pr site, Pr(2) is bonded in a 10-coordinate geometry to two equivalent Sn(2), two equivalent Sn(3), and six equivalent Sn(4) atoms. Ni(1) is bonded in a 5-coordinate geometry to one Sn(4), two equivalent Sn(2), and two equivalent Sn(3) atoms. There are four inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a linear geometry to two equivalent Pr(1) and four equivalent Sn(2) atoms. In the second Sn site, Sn(2) is bonded in a 6-coordinate geometry to two equivalent Pr(2), two equivalent Ni(1), and two equivalent Sn(1) atoms. In the third Sn site, Sn(3) is bonded in a 5-coordinate geometry to one Pr(1), two equivalent Pr(2), and two equivalent Ni(1) atoms. In the fourth Sn site, Sn(4) is bonded in a 9-coordinate geometry to six equivalent Pr(2), one Ni(1), and two equivalent Sn(4) atoms.
Pr3Ni2Sn7 crystallizes in the orthorhombic Cmmm space group. There are two inequivalent Pr sites. In the first Pr site, Pr(1) is bonded in a square co-planar geometry to two equivalent Sn(1) and two equivalent Sn(3) atoms. Both Pr(1)-Sn(1) bond lengths are 2.73 Å. Both Pr(1)-Sn(3) bond lengths are 3.06 Å. In the second Pr site, Pr(2) is bonded in a 10-coordinate geometry to two equivalent Sn(2), two equivalent Sn(3), and six equivalent Sn(4) atoms. Both Pr(2)-Sn(2) bond lengths are 3.67 Å. Both Pr(2)-Sn(3) bond lengths are 3.53 Å. There are four shorter (3.68 Å) and two longer (3.76 Å) Pr(2)-Sn(4) bond lengths. Ni(1) is bonded in a 5-coordinate geometry to one Sn(4), two equivalent Sn(2), and two equivalent Sn(3) atoms. The Ni(1)-Sn(4) bond length is 2.46 Å. Both Ni(1)-Sn(2) bond lengths are 2.99 Å. Both Ni(1)-Sn(3) bond lengths are 2.40 Å. There are four inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a linear geometry to two equivalent Pr(1) and four equivalent Sn(2) atoms. All Sn(1)-Sn(2) bond lengths are 3.38 Å. In the second Sn site, Sn(2) is bonded in a 6-coordinate geometry to two equivalent Pr(2), two equivalent Ni(1), and two equivalent Sn(1) atoms. In the third Sn site, Sn(3) is bonded in a 5-coordinate geometry to one Pr(1), two equivalent Pr(2), and two equivalent Ni(1) atoms. In the fourth Sn site, Sn(4) is bonded in a 9-coordinate geometry to six equivalent Pr(2), one Ni(1), and two equivalent Sn(4) atoms. Both Sn(4)-Sn(4) bond lengths are 2.90 Å.