MgPr2Si4 crystallizes in the tetragonal I4_1md space group. Mg(1) is bonded in a distorted square co-planar geometry to two equivalent Pr(1), two equivalent Pr(2), two equivalent Si(3), and two equivalent Si(4) atoms. There are two inequivalent Pr sites. In the first Pr site, Pr(1) is bonded in a 10-coordinate geometry to two equivalent Mg(1), two equivalent Pr(1), two equivalent Si(1), two equivalent Si(2), and two equivalent Si(3) atoms. In the second Pr site, Pr(2) is bonded in a 10-coordinate geometry to two equivalent Mg(1), two equivalent Pr(2), two equivalent Si(1), two equivalent Si(2), and two equivalent Si(4) atoms. There are four inequivalent Si sites. In the first Si site, Si(3) is bonded in a 6-coordinate geometry to two equivalent Mg(1), two equivalent Pr(1), one Si(1), and one Si(3) atom. In the second Si site, Si(4) is bonded in a 6-coordinate geometry to two equivalent Mg(1), two equivalent Pr(2), one Si(2), and one Si(4) atom. In the third Si site, Si(1) is bonded in a 8-coordinate geometry to two equivalent Pr(1), two equivalent Pr(2), one Si(1), one Si(3), and two equivalent Si(2) atoms. In the fourth Si site, Si(2) is bonded in a 8-coordinate geometry to two equivalent Pr(1), two equivalent Pr(2), one Si(2), one Si(4), and two equivalent Si(1) atoms.
MgPr2Si4 crystallizes in the tetragonal I4_1md space group. Mg(1) is bonded in a distorted square co-planar geometry to two equivalent Pr(1), two equivalent Pr(2), two equivalent Si(3), and two equivalent Si(4) atoms. Both Mg(1)-Pr(1) bond lengths are 3.34 Å. Both Mg(1)-Pr(2) bond lengths are 3.34 Å. Both Mg(1)-Si(3) bond lengths are 2.79 Å. Both Mg(1)-Si(4) bond lengths are 2.79 Å. There are two inequivalent Pr sites. In the first Pr site, Pr(1) is bonded in a 10-coordinate geometry to two equivalent Mg(1), two equivalent Pr(1), two equivalent Si(1), two equivalent Si(2), and two equivalent Si(3) atoms. There is one shorter (3.03 Å) and one longer (3.07 Å) Pr(1)-Pr(1) bond length. Both Pr(1)-Si(1) bond lengths are 3.29 Å. Both Pr(1)-Si(2) bond lengths are 3.04 Å. Both Pr(1)-Si(3) bond lengths are 3.28 Å. In the second Pr site, Pr(2) is bonded in a 10-coordinate geometry to two equivalent Mg(1), two equivalent Pr(2), two equivalent Si(1), two equivalent Si(2), and two equivalent Si(4) atoms. There is one shorter (3.04 Å) and one longer (3.07 Å) Pr(2)-Pr(2) bond length. Both Pr(2)-Si(1) bond lengths are 3.05 Å. Both Pr(2)-Si(2) bond lengths are 3.29 Å. Both Pr(2)-Si(4) bond lengths are 3.28 Å. There are four inequivalent Si sites. In the first Si site, Si(3) is bonded in a 6-coordinate geometry to two equivalent Mg(1), two equivalent Pr(1), one Si(1), and one Si(3) atom. The Si(3)-Si(1) bond length is 2.38 Å. The Si(3)-Si(3) bond length is 2.37 Å. In the second Si site, Si(4) is bonded in a 6-coordinate geometry to two equivalent Mg(1), two equivalent Pr(2), one Si(2), and one Si(4) atom. The Si(4)-Si(2) bond length is 2.39 Å. The Si(4)-Si(4) bond length is 2.37 Å. In the third Si site, Si(1) is bonded in a 8-coordinate geometry to two equivalent Pr(1), two equivalent Pr(2), one Si(1), one Si(3), and two equivalent Si(2) atoms. The Si(1)-Si(1) bond length is 2.89 Å. Both Si(1)-Si(2) bond lengths are 2.49 Å. In the fourth Si site, Si(2) is bonded in a 8-coordinate geometry to two equivalent Pr(1), two equivalent Pr(2), one Si(2), one Si(4), and two equivalent Si(1) atoms. The Si(2)-Si(2) bond length is 2.85 Å.