Pr5NiSb2 crystallizes in the orthorhombic Pnma space group. There are four inequivalent Pr sites. In the first Pr site, Pr(1) is bonded to one Ni(1) and four equivalent Sb(1) atoms to form a mixture of distorted edge, corner, and face-sharing PrNiSb4 trigonal bipyramids. In the second Pr site, Pr(2) is bonded to one Ni(1) and four equivalent Sb(1) atoms to form a mixture of distorted edge and corner-sharing PrNiSb4 trigonal bipyramids. In the third Pr site, Pr(3) is bonded to one Ni(1) and four equivalent Sb(1) atoms to form a mixture of distorted edge, corner, and face-sharing PrNiSb4 square pyramids. In the fourth Pr site, Pr(4) is bonded in a 5-coordinate geometry to two equivalent Ni(1) and three equivalent Sb(1) atoms. Ni(1) is bonded to one Pr(1), one Pr(2), one Pr(3), and four equivalent Pr(4) atoms to form distorted edge-sharing NiPr7 pentagonal bipyramids. Sb(1) is bonded in a 9-coordinate geometry to two equivalent Pr(1), two equivalent Pr(2), two equivalent Pr(3), and three equivalent Pr(4) atoms.
Pr5NiSb2 crystallizes in the orthorhombic Pnma space group. There are four inequivalent Pr sites. In the first Pr site, Pr(1) is bonded to one Ni(1) and four equivalent Sb(1) atoms to form a mixture of distorted edge, corner, and face-sharing PrNiSb4 trigonal bipyramids. The Pr(1)-Ni(1) bond length is 2.86 Å. There are two shorter (3.26 Å) and two longer (3.28 Å) Pr(1)-Sb(1) bond lengths. In the second Pr site, Pr(2) is bonded to one Ni(1) and four equivalent Sb(1) atoms to form a mixture of distorted edge and corner-sharing PrNiSb4 trigonal bipyramids. The Pr(2)-Ni(1) bond length is 2.99 Å. There are two shorter (3.29 Å) and two longer (3.34 Å) Pr(2)-Sb(1) bond lengths. In the third Pr site, Pr(3) is bonded to one Ni(1) and four equivalent Sb(1) atoms to form a mixture of distorted edge, corner, and face-sharing PrNiSb4 square pyramids. The Pr(3)-Ni(1) bond length is 3.21 Å. There are two shorter (3.23 Å) and two longer (3.25 Å) Pr(3)-Sb(1) bond lengths. In the fourth Pr site, Pr(4) is bonded in a 5-coordinate geometry to two equivalent Ni(1) and three equivalent Sb(1) atoms. There is one shorter (2.83 Å) and one longer (3.04 Å) Pr(4)-Ni(1) bond length. There are a spread of Pr(4)-Sb(1) bond distances ranging from 3.42-3.77 Å. Ni(1) is bonded to one Pr(1), one Pr(2), one Pr(3), and four equivalent Pr(4) atoms to form distorted edge-sharing NiPr7 pentagonal bipyramids. Sb(1) is bonded in a 9-coordinate geometry to two equivalent Pr(1), two equivalent Pr(2), two equivalent Pr(3), and three equivalent Pr(4) atoms.