MgPrSi2 crystallizes in the tetragonal I4_1/amd space group. Mg(1) is bonded in a distorted square co-planar geometry to four equivalent Si(1) atoms. Pr(1) is bonded in a 10-coordinate geometry to four equivalent Si(1) and six equivalent Si(2) atoms. There are four inequivalent Si sites. In the first Si site, Si(1) is bonded in a 9-coordinate geometry to four equivalent Mg(1), four equivalent Pr(1), and one Si(2) atom. In the second Si site, Si(2) is bonded in a 9-coordinate geometry to six equivalent Pr(1), one Si(1), and two equivalent Si(2) atoms. In the third Si site, Si(2) is bonded in a 9-coordinate geometry to six equivalent Pr(1), one Si(1), and two equivalent Si(2) atoms. In the fourth Si site, Si(2) is bonded in a 9-coordinate geometry to six equivalent Pr(1), one Si(1), and two equivalent Si(2) atoms.
MgPrSi2 crystallizes in the tetragonal I4_1/amd space group. Mg(1) is bonded in a distorted square co-planar geometry to four equivalent Si(1) atoms. All Mg(1)-Si(1) bond lengths are 2.77 Å. Pr(1) is bonded in a 10-coordinate geometry to four equivalent Si(1) and six equivalent Si(2) atoms. All Pr(1)-Si(1) bond lengths are 3.22 Å. There are two shorter (3.12 Å) and four longer (3.27 Å) Pr(1)-Si(2) bond lengths. There are four inequivalent Si sites. In the first Si site, Si(1) is bonded in a 9-coordinate geometry to four equivalent Mg(1), four equivalent Pr(1), and one Si(2) atom. The Si(1)-Si(2) bond length is 2.31 Å. In the second Si site, Si(2) is bonded in a 9-coordinate geometry to six equivalent Pr(1), one Si(1), and two equivalent Si(2) atoms. Both Si(2)-Si(2) bond lengths are 2.39 Å. In the third Si site, Si(2) is bonded in a 9-coordinate geometry to six equivalent Pr(1), one Si(1), and two equivalent Si(2) atoms. There are two shorter (3.12 Å) and four longer (3.27 Å) Si(2)-Pr(1) bond lengths. The Si(2)-Si(1) bond length is 2.31 Å. Both Si(2)-Si(2) bond lengths are 2.39 Å. In the fourth Si site, Si(2) is bonded in a 9-coordinate geometry to six equivalent Pr(1), one Si(1), and two equivalent Si(2) atoms. There are two shorter (3.12 Å) and four longer (3.27 Å) Si(2)-Pr(1) bond lengths. The Si(2)-Si(1) bond length is 2.31 Å.