PrSi3N5 crystallizes in the orthorhombic P2_12_12_1 space group. Pr(1) is bonded in a 9-coordinate geometry to one N(5), two equivalent N(1), two equivalent N(2), two equivalent N(3), and two equivalent N(4) atoms. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded to one N(1), one N(2), and two equivalent N(5) atoms to form corner-sharing SiN4 tetrahedra. In the second Si site, Si(2) is bonded to one N(2), one N(3), one N(4), and one N(5) atom to form corner-sharing SiN4 tetrahedra. In the third Si site, Si(3) is bonded to one N(1), one N(2), one N(3), and one N(4) atom to form corner-sharing SiN4 tetrahedra. There are five inequivalent N sites. In the first N site, N(5) is bonded in a distorted trigonal non-coplanar geometry to one Pr(1), one Si(2), and two equivalent Si(1) atoms. In the second N site, N(1) is bonded in a 2-coordinate geometry to two equivalent Pr(1), one Si(1), and one Si(3) atom. In the third N site, N(2) is bonded in a distorted trigonal planar geometry to two equivalent Pr(1), one Si(1), one Si(2), and one Si(3) atom. In the fourth N site, N(3) is bonded to two equivalent Pr(1), one Si(2), and one Si(3) atom to form distorted corner-sharing NPr2Si2 tetrahedra. In the fifth N site, N(4) is bonded in a 2-coordinate geometry to two equivalent Pr(1), one Si(2), and one Si(3) atom.
PrSi3N5 crystallizes in the orthorhombic P2_12_12_1 space group. Pr(1) is bonded in a 9-coordinate geometry to one N(5), two equivalent N(1), two equivalent N(2), two equivalent N(3), and two equivalent N(4) atoms. The Pr(1)-N(5) bond length is 2.83 Å. There is one shorter (2.65 Å) and one longer (2.81 Å) Pr(1)-N(1) bond length. There is one shorter (3.06 Å) and one longer (3.15 Å) Pr(1)-N(2) bond length. There is one shorter (2.42 Å) and one longer (2.69 Å) Pr(1)-N(3) bond length. There is one shorter (2.55 Å) and one longer (2.87 Å) Pr(1)-N(4) bond length. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded to one N(1), one N(2), and two equivalent N(5) atoms to form corner-sharing SiN4 tetrahedra. The Si(1)-N(1) bond length is 1.69 Å. The Si(1)-N(2) bond length is 1.77 Å. There is one shorter (1.75 Å) and one longer (1.76 Å) Si(1)-N(5) bond length. In the second Si site, Si(2) is bonded to one N(2), one N(3), one N(4), and one N(5) atom to form corner-sharing SiN4 tetrahedra. The Si(2)-N(2) bond length is 1.77 Å. The Si(2)-N(3) bond length is 1.70 Å. The Si(2)-N(4) bond length is 1.67 Å. The Si(2)-N(5) bond length is 1.77 Å. In the third Si site, Si(3) is bonded to one N(1), one N(2), one N(3), and one N(4) atom to form corner-sharing SiN4 tetrahedra. The Si(3)-N(1) bond length is 1.71 Å. The Si(3)-N(2) bond length is 1.80 Å. The Si(3)-N(3) bond length is 1.69 Å. The Si(3)-N(4) bond length is 1.69 Å. There are five inequivalent N sites. In the first N site, N(5) is bonded in a distorted trigonal non-coplanar geometry to one Pr(1), one Si(2), and two equivalent Si(1) atoms. In the second N site, N(1) is bonded in a 2-coordinate geometry to two equivalent Pr(1), one Si(1), and one Si(3) atom. In the third N site, N(2) is bonded in a distorted trigonal planar geometry to two equivalent Pr(1), one Si(1), one Si(2), and one Si(3) atom. In the fourth N site, N(3) is bonded to two equivalent Pr(1), one Si(2), and one Si(3) atom to form distorted corner-sharing NPr2Si2 tetrahedra. In the fifth N site, N(4) is bonded in a 2-coordinate geometry to two equivalent Pr(1), one Si(2), and one Si(3) atom.