Pr7C3I10 crystallizes in the triclinic P-1 space group. There are seven inequivalent Pr sites. In the first Pr site, Pr(1) is bonded to one C(2), one I(1), one I(3), one I(6), and two equivalent I(8) atoms to form distorted PrCI5 octahedra that share  an edgeedge with one Pr(1)CI5 octahedra,  an edgeedge with one Pr(7)CI5 octahedra, edges with two equivalent Pr(2)C2I5 pentagonal bipyramids, and edges with two equivalent Pr(6)C2I5 pentagonal bipyramids. In the second Pr site, Pr(2) is bonded to one C(1), one C(2), one I(10), one I(6), one I(8), and two equivalent I(5) atoms to form distorted PrC2I5 pentagonal bipyramids that share  a cornercorner with one Pr(3)CI5 octahedra, corners with two equivalent Pr(6)C2I5 pentagonal bipyramids,  an edgeedge with one Pr(3)CI5 octahedra, edges with two equivalent Pr(1)CI5 octahedra,  an edgeedge with one Pr(2)C2I5 pentagonal bipyramid, and  a faceface with one Pr(6)C2I5 pentagonal bipyramid. The corner-sharing octahedral tilt angles are 1°. In the third Pr site, Pr(3) is bonded to one C(1), one I(4), one I(5), one I(9), and two equivalent I(7) atoms to form distorted PrCI5 octahedra that share  a cornercorner with one Pr(2)C2I5 pentagonal bipyramid,  an edgeedge with one Pr(3)CI5 octahedra, edges with two equivalent Pr(7)CI5 octahedra,  an edgeedge with one Pr(2)C2I5 pentagonal bipyramid, and  an edgeedge with one Pr(6)C2I5 pentagonal bipyramid. In the fourth Pr site, Pr(4) is bonded in a 8-coordinate geometry to one C(1), one C(2), two equivalent C(3), one I(1), one I(10), one I(2), and one I(4) atom. In the fifth Pr site, Pr(5) is bonded in a 8-coordinate geometry to one C(1), one C(2), two equivalent C(3), one I(3), one I(7), and two equivalent I(2) atoms. In the sixth Pr site, Pr(6) is bonded to one C(1), one C(2), one I(10), one I(2), one I(6), one I(8), and one I(9) atom to form distorted PrC2I5 pentagonal bipyramids that share  a cornercorner with one Pr(7)CI5 octahedra, corners with two equivalent Pr(2)C2I5 pentagonal bipyramids,  an edgeedge with one Pr(3)CI5 octahedra, edges with two equivalent Pr(1)CI5 octahedra, and  a faceface with one Pr(2)C2I5 pentagonal bipyramid. The corner-sharing octahedral tilt angles are 13°. In the seventh Pr site, Pr(7) is bonded to one C(3), one I(1), one I(3), one I(4), one I(7), and one I(9) atom to form distorted PrCI5 octahedra that share  a cornercorner with one Pr(6)C2I5 pentagonal bipyramid,  an edgeedge with one Pr(1)CI5 octahedra, and edges with two equivalent Pr(3)CI5 octahedra. There are three inequivalent C sites. In the first C site, C(1) is bonded in a 6-coordinate geometry to one Pr(2), one Pr(3), one Pr(4), one Pr(5), one Pr(6), and one C(2) atom. In the second C site, C(2) is bonded in a 6-coordinate geometry to one Pr(1), one Pr(2), one Pr(4), one Pr(5), one Pr(6), and one C(1) atom. In the third C site, C(3) is bonded in a 6-coordinate geometry to one Pr(7), two equivalent Pr(4), two equivalent Pr(5), and one C(3) atom. There are ten inequivalent I sites. In the first I site, I(1) is bonded in a 3-coordinate geometry to one Pr(1), one Pr(4), and one Pr(7) atom. In the second I site, I(2) is bonded in a distorted rectangular see-saw-like geometry to one Pr(4), one Pr(6), and two equivalent Pr(5) atoms. In the third I site, I(3) is bonded in a 3-coordinate geometry to one Pr(1), one Pr(5), and one Pr(7) atom. In the fourth I site, I(4) is bonded in a distorted T-shaped geometry to one Pr(3), one Pr(4), and one Pr(7) atom. In the fifth I site, I(5) is bonded in a 3-coordinate geometry to one Pr(3) and two equivalent Pr(2) atoms. In the sixth I site, I(6) is bonded in a distorted T-shaped geometry to one Pr(1), one Pr(2), and one Pr(6) atom. In the seventh I site, I(7) is bonded in a rectangular see-saw-like geometry to one Pr(5), one Pr(7), and two equivalent Pr(3) atoms. In the eighth I site, I(8) is bonded in a rectangular see-saw-like geometry to one Pr(2), one Pr(6), and two equivalent Pr(1) atoms. In the ninth I site, I(9) is bonded in a distorted T-shaped geometry to one Pr(3), one Pr(6), and one Pr(7) atom. In the tenth I site, I(10) is bonded in a 3-coordinate geometry to one Pr(2), one Pr(4), and one Pr(6) atom.
Pr7C3I10 crystallizes in the triclinic P-1 space group. There are seven inequivalent Pr sites. In the first Pr site, Pr(1) is bonded to one C(2), one I(1), one I(3), one I(6), and two equivalent I(8) atoms to form distorted PrCI5 octahedra that share  an edgeedge with one Pr(1)CI5 octahedra,  an edgeedge with one Pr(7)CI5 octahedra, edges with two equivalent Pr(2)C2I5 pentagonal bipyramids, and edges with two equivalent Pr(6)C2I5 pentagonal bipyramids. The Pr(1)-C(2) bond length is 2.33 Å. The Pr(1)-I(1) bond length is 3.18 Å. The Pr(1)-I(3) bond length is 3.19 Å. The Pr(1)-I(6) bond length is 3.42 Å. Both Pr(1)-I(8) bond lengths are 3.25 Å. In the second Pr site, Pr(2) is bonded to one C(1), one C(2), one I(10), one I(6), one I(8), and two equivalent I(5) atoms to form distorted PrC2I5 pentagonal bipyramids that share  a cornercorner with one Pr(3)CI5 octahedra, corners with two equivalent Pr(6)C2I5 pentagonal bipyramids,  an edgeedge with one Pr(3)CI5 octahedra, edges with two equivalent Pr(1)CI5 octahedra,  an edgeedge with one Pr(2)C2I5 pentagonal bipyramid, and  a faceface with one Pr(6)C2I5 pentagonal bipyramid. The corner-sharing octahedral tilt angles are 1°. The Pr(2)-C(1) bond length is 2.64 Å. The Pr(2)-C(2) bond length is 2.65 Å. The Pr(2)-I(10) bond length is 3.15 Å. The Pr(2)-I(6) bond length is 3.20 Å. The Pr(2)-I(8) bond length is 3.33 Å. There is one shorter (3.23 Å) and one longer (3.53 Å) Pr(2)-I(5) bond length. In the third Pr site, Pr(3) is bonded to one C(1), one I(4), one I(5), one I(9), and two equivalent I(7) atoms to form distorted PrCI5 octahedra that share  a cornercorner with one Pr(2)C2I5 pentagonal bipyramid,  an edgeedge with one Pr(3)CI5 octahedra, edges with two equivalent Pr(7)CI5 octahedra,  an edgeedge with one Pr(2)C2I5 pentagonal bipyramid, and  an edgeedge with one Pr(6)C2I5 pentagonal bipyramid. The Pr(3)-C(1) bond length is 2.32 Å. The Pr(3)-I(4) bond length is 3.19 Å. The Pr(3)-I(5) bond length is 3.15 Å. The Pr(3)-I(9) bond length is 3.16 Å. There is one shorter (3.25 Å) and one longer (3.47 Å) Pr(3)-I(7) bond length. In the fourth Pr site, Pr(4) is bonded in a 8-coordinate geometry to one C(1), one C(2), two equivalent C(3), one I(1), one I(10), one I(2), and one I(4) atom. The Pr(4)-C(1) bond length is 2.75 Å. The Pr(4)-C(2) bond length is 2.74 Å. Both Pr(4)-C(3) bond lengths are 2.77 Å. The Pr(4)-I(1) bond length is 3.31 Å. The Pr(4)-I(10) bond length is 3.33 Å. The Pr(4)-I(2) bond length is 3.42 Å. The Pr(4)-I(4) bond length is 3.32 Å. In the fifth Pr site, Pr(5) is bonded in a 8-coordinate geometry to one C(1), one C(2), two equivalent C(3), one I(3), one I(7), and two equivalent I(2) atoms. The Pr(5)-C(1) bond length is 2.76 Å. The Pr(5)-C(2) bond length is 2.74 Å. There is one shorter (2.71 Å) and one longer (2.73 Å) Pr(5)-C(3) bond length. The Pr(5)-I(3) bond length is 3.29 Å. The Pr(5)-I(7) bond length is 3.36 Å. There is one shorter (3.37 Å) and one longer (3.43 Å) Pr(5)-I(2) bond length. In the sixth Pr site, Pr(6) is bonded to one C(1), one C(2), one I(10), one I(2), one I(6), one I(8), and one I(9) atom to form distorted PrC2I5 pentagonal bipyramids that share  a cornercorner with one Pr(7)CI5 octahedra, corners with two equivalent Pr(2)C2I5 pentagonal bipyramids,  an edgeedge with one Pr(3)CI5 octahedra, edges with two equivalent Pr(1)CI5 octahedra, and  a faceface with one Pr(2)C2I5 pentagonal bipyramid. The corner-sharing octahedral tilt angles are 13°. The Pr(6)-C(1) bond length is 2.63 Å. The Pr(6)-C(2) bond length is 2.64 Å. The Pr(6)-I(10) bond length is 3.49 Å. The Pr(6)-I(2) bond length is 3.20 Å. The Pr(6)-I(6) bond length is 3.16 Å. The Pr(6)-I(8) bond length is 3.35 Å. The Pr(6)-I(9) bond length is 3.24 Å. In the seventh Pr site, Pr(7) is bonded to one C(3), one I(1), one I(3), one I(4), one I(7), and one I(9) atom to form distorted PrCI5 octahedra that share  a cornercorner with one Pr(6)C2I5 pentagonal bipyramid,  an edgeedge with one Pr(1)CI5 octahedra, and edges with two equivalent Pr(3)CI5 octahedra. The Pr(7)-C(3) bond length is 2.31 Å. The Pr(7)-I(1) bond length is 3.19 Å. The Pr(7)-I(3) bond length is 3.17 Å. The Pr(7)-I(4) bond length is 3.20 Å. The Pr(7)-I(7) bond length is 3.23 Å. The Pr(7)-I(9) bond length is 3.55 Å. There are three inequivalent C sites. In the first C site, C(1) is bonded in a 6-coordinate geometry to one Pr(2), one Pr(3), one Pr(4), one Pr(5), one Pr(6), and one C(2) atom. The C(1)-C(2) bond length is 1.40 Å. In the second C site, C(2) is bonded in a 6-coordinate geometry to one Pr(1), one Pr(2), one Pr(4), one Pr(5), one Pr(6), and one C(1) atom. In the third C site, C(3) is bonded in a 6-coordinate geometry to one Pr(7), two equivalent Pr(4), two equivalent Pr(5), and one C(3) atom. The C(3)-C(3) bond length is 1.39 Å. There are ten inequivalent I sites. In the first I site, I(1) is bonded in a 3-coordinate geometry to one Pr(1), one Pr(4), and one Pr(7) atom. In the second I site, I(2) is bonded in a distorted rectangular see-saw-like geometry to one Pr(4), one Pr(6), and two equivalent Pr(5) atoms. In the third I site, I(3) is bonded in a 3-coordinate geometry to one Pr(1), one Pr(5), and one Pr(7) atom. In the fourth I site, I(4) is bonded in a distorted T-shaped geometry to one Pr(3), one Pr(4), and one Pr(7) atom. In the fifth I site, I(5) is bonded in a 3-coordinate geometry to one Pr(3) and two equivalent Pr(2) atoms. In the sixth I site, I(6) is bonded in a distorted T-shaped geometry to one Pr(1), one Pr(2), and one Pr(6) atom. In the seventh I site, I(7) is bonded in a rectangular see-saw-like geometry to one Pr(5), one Pr(7), and two equivalent Pr(3) atoms. In the eighth I site, I(8) is bonded in a rectangular see-saw-like geometry to one Pr(2), one Pr(6), and two equivalent Pr(1) atoms. In the ninth I site, I(9) is bonded in a distorted T-shaped geometry to one Pr(3), one Pr(6), and one Pr(7) atom. In the tenth I site, I(10) is bonded in a 3-coordinate geometry to one Pr(2), one Pr(4), and one Pr(6) atom.