Pr3(Ni3Si)2 crystallizes in the cubic Im-3m space group. Pr(1) is bonded in a 12-coordinate geometry to eight equivalent Ni(1) and four equivalent Si(1) atoms. Ni(1) is bonded in a 10-coordinate geometry to four equivalent Pr(1), four equivalent Ni(1), and two equivalent Si(1) atoms. Si(1) is bonded to six equivalent Pr(1) and six equivalent Ni(1) atoms to form a mixture of face and corner-sharing SiPr6Ni6 cuboctahedra.
Pr3(Ni3Si)2 crystallizes in the cubic Im-3m space group. Pr(1) is bonded in a 12-coordinate geometry to eight equivalent Ni(1) and four equivalent Si(1) atoms. There are four shorter (2.89 Å) and four longer (2.99 Å) Pr(1)-Ni(1) bond lengths. All Pr(1)-Si(1) bond lengths are 3.18 Å. Ni(1) is bonded in a 10-coordinate geometry to four equivalent Pr(1), four equivalent Ni(1), and two equivalent Si(1) atoms. All Ni(1)-Ni(1) bond lengths are 2.58 Å. Both Ni(1)-Si(1) bond lengths are 2.46 Å. Si(1) is bonded to six equivalent Pr(1) and six equivalent Ni(1) atoms to form a mixture of face and corner-sharing SiPr6Ni6 cuboctahedra.