Pr2NiGa7 crystallizes in the tetragonal P4mm space group. There are two inequivalent Pr sites. In the first Pr site, Pr(1) is bonded in a 16-coordinate geometry to four equivalent Ni(1), four equivalent Ga(1), four equivalent Ga(2), and four equivalent Ga(5) atoms. In the second Pr site, Pr(2) is bonded in a 16-coordinate geometry to four equivalent Ga(1), four equivalent Ga(2), four equivalent Ga(3), and four equivalent Ga(4) atoms. Ni(1) is bonded in a 5-coordinate geometry to four equivalent Pr(1), one Ga(5), and four equivalent Ga(1) atoms. There are five inequivalent Ga sites. In the first Ga site, Ga(1) is bonded in a 2-coordinate geometry to two equivalent Pr(1), two equivalent Pr(2), two equivalent Ni(1), and two equivalent Ga(4) atoms. In the second Ga site, Ga(2) is bonded to two equivalent Pr(1), two equivalent Pr(2), two equivalent Ga(3), two equivalent Ga(5), and four equivalent Ga(2) atoms to form a mixture of distorted face and corner-sharing GaPr4Ga8 cuboctahedra. In the third Ga site, Ga(3) is bonded in a 9-coordinate geometry to four equivalent Pr(2), one Ga(4), and four equivalent Ga(2) atoms. In the fourth Ga site, Ga(4) is bonded in a 9-coordinate geometry to four equivalent Pr(2), one Ga(3), and four equivalent Ga(1) atoms. In the fifth Ga site, Ga(5) is bonded in a 9-coordinate geometry to four equivalent Pr(1), one Ni(1), and four equivalent Ga(2) atoms.
Pr2NiGa7 crystallizes in the tetragonal P4mm space group. There are two inequivalent Pr sites. In the first Pr site, Pr(1) is bonded in a 16-coordinate geometry to four equivalent Ni(1), four equivalent Ga(1), four equivalent Ga(2), and four equivalent Ga(5) atoms. All Pr(1)-Ni(1) bond lengths are 3.34 Å. All Pr(1)-Ga(1) bond lengths are 3.26 Å. All Pr(1)-Ga(2) bond lengths are 3.30 Å. All Pr(1)-Ga(5) bond lengths are 3.16 Å. In the second Pr site, Pr(2) is bonded in a 16-coordinate geometry to four equivalent Ga(1), four equivalent Ga(2), four equivalent Ga(3), and four equivalent Ga(4) atoms. All Pr(2)-Ga(1) bond lengths are 3.35 Å. All Pr(2)-Ga(2) bond lengths are 3.55 Å. All Pr(2)-Ga(3) bond lengths are 3.35 Å. All Pr(2)-Ga(4) bond lengths are 3.20 Å. Ni(1) is bonded in a 5-coordinate geometry to four equivalent Pr(1), one Ga(5), and four equivalent Ga(1) atoms. The Ni(1)-Ga(5) bond length is 2.32 Å. All Ni(1)-Ga(1) bond lengths are 2.38 Å. There are five inequivalent Ga sites. In the first Ga site, Ga(1) is bonded in a 2-coordinate geometry to two equivalent Pr(1), two equivalent Pr(2), two equivalent Ni(1), and two equivalent Ga(4) atoms. Both Ga(1)-Ga(4) bond lengths are 2.64 Å. In the second Ga site, Ga(2) is bonded to two equivalent Pr(1), two equivalent Pr(2), two equivalent Ga(3), two equivalent Ga(5), and four equivalent Ga(2) atoms to form a mixture of distorted face and corner-sharing GaPr4Ga8 cuboctahedra. Both Ga(2)-Ga(3) bond lengths are 2.56 Å. Both Ga(2)-Ga(5) bond lengths are 2.67 Å. All Ga(2)-Ga(2) bond lengths are 3.03 Å. In the third Ga site, Ga(3) is bonded in a 9-coordinate geometry to four equivalent Pr(2), one Ga(4), and four equivalent Ga(2) atoms. The Ga(3)-Ga(4) bond length is 2.46 Å. In the fourth Ga site, Ga(4) is bonded in a 9-coordinate geometry to four equivalent Pr(2), one Ga(3), and four equivalent Ga(1) atoms. In the fifth Ga site, Ga(5) is bonded in a 9-coordinate geometry to four equivalent Pr(1), one Ni(1), and four equivalent Ga(2) atoms.