PrMnSi2 crystallizes in the orthorhombic Cmcm space group. Pr(1) is bonded in a 15-coordinate geometry to five equivalent Mn(1), four equivalent Si(2), and six equivalent Si(1) atoms. Mn(1) is bonded in a 5-coordinate geometry to five equivalent Pr(1), one Si(1), and four equivalent Si(2) atoms. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded in a distorted single-bond geometry to six equivalent Pr(1), one Mn(1), and two equivalent Si(1) atoms. In the second Si site, Si(2) is bonded in a 4-coordinate geometry to four equivalent Pr(1) and four equivalent Mn(1) atoms.
PrMnSi2 crystallizes in the orthorhombic Cmcm space group. Pr(1) is bonded in a 15-coordinate geometry to five equivalent Mn(1), four equivalent Si(2), and six equivalent Si(1) atoms. There are four shorter (3.29 Å) and one longer (3.39 Å) Pr(1)-Mn(1) bond length. There are two shorter (3.15 Å) and two longer (3.21 Å) Pr(1)-Si(2) bond lengths. There are four shorter (3.20 Å) and two longer (3.25 Å) Pr(1)-Si(1) bond lengths. Mn(1) is bonded in a 5-coordinate geometry to five equivalent Pr(1), one Si(1), and four equivalent Si(2) atoms. The Mn(1)-Si(1) bond length is 2.35 Å. There are two shorter (2.35 Å) and two longer (2.40 Å) Mn(1)-Si(2) bond lengths. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded in a distorted single-bond geometry to six equivalent Pr(1), one Mn(1), and two equivalent Si(1) atoms. Both Si(1)-Si(1) bond lengths are 2.52 Å. In the second Si site, Si(2) is bonded in a 4-coordinate geometry to four equivalent Pr(1) and four equivalent Mn(1) atoms.