Y7C2NI12 crystallizes in the triclinic P-1 space group. There are seven inequivalent Y sites. In the first Y site, Y(1) is bonded in a distorted single-bond geometry to one C(1), one C(2), one N(1), one I(1), one I(10), one I(4), and one I(5) atom. In the second Y site, Y(2) is bonded to one C(1), one I(12), one I(2), one I(3), one I(4), and one I(9) atom to form distorted YCI5 octahedra that share  an edgeedge with one Y(6)CI5 octahedra and  an edgeedge with one Y(5)C2I5 pentagonal bipyramid. In the third Y site, Y(3) is bonded in a distorted single-bond geometry to one C(1), one C(2), one N(1), one I(10), one I(12), one I(2), and one I(8) atom. In the fourth Y site, Y(4) is bonded in a 7-coordinate geometry to one C(1), one C(2), one I(3), one I(5), one I(6), and two equivalent I(11) atoms. In the fifth Y site, Y(5) is bonded to one C(1), one C(2), one I(11), one I(8), one I(9), and two equivalent I(7) atoms to form distorted YC2I5 pentagonal bipyramids that share  a cornercorner with one Y(6)CI5 octahedra,  an edgeedge with one Y(2)CI5 octahedra,  an edgeedge with one Y(6)CI5 octahedra, and  an edgeedge with one Y(5)C2I5 pentagonal bipyramid. The corner-sharing octahedral tilt angles are 3°. In the sixth Y site, Y(6) is bonded to one C(2), one I(1), one I(12), one I(3), one I(6), and one I(7) atom to form distorted YCI5 octahedra that share  a cornercorner with one Y(5)C2I5 pentagonal bipyramid,  an edgeedge with one Y(2)CI5 octahedra, and  an edgeedge with one Y(5)C2I5 pentagonal bipyramid. In the seventh Y site, Y(7) is bonded in a 2-coordinate geometry to two equivalent N(1), one I(1), one I(12), one I(2), and one I(4) atom. There are two inequivalent C sites. In the first C site, C(1) is bonded in a 6-coordinate geometry to one Y(1), one Y(2), one Y(3), one Y(4), one Y(5), and one C(2) atom. In the second C site, C(2) is bonded in a 6-coordinate geometry to one Y(1), one Y(3), one Y(4), one Y(5), one Y(6), and one C(1) atom. N(1) is bonded to one Y(1), one Y(3), and two equivalent Y(7) atoms to form NY4 tetrahedra that share  a cornercorner with one I(12)Y4 trigonal pyramid,  an edgeedge with one N(1)Y4 tetrahedra, and  an edgeedge with one I(12)Y4 trigonal pyramid. There are twelve inequivalent I sites. In the first I site, I(1) is bonded in a 3-coordinate geometry to one Y(1), one Y(6), and one Y(7) atom. In the second I site, I(2) is bonded in a distorted T-shaped geometry to one Y(2), one Y(3), and one Y(7) atom. In the third I site, I(3) is bonded in a T-shaped geometry to one Y(2), one Y(4), and one Y(6) atom. In the fourth I site, I(4) is bonded in a distorted T-shaped geometry to one Y(1), one Y(2), and one Y(7) atom. In the fifth I site, I(5) is bonded in a 2-coordinate geometry to one Y(1) and one Y(4) atom. In the sixth I site, I(6) is bonded in a distorted L-shaped geometry to one Y(4) and one Y(6) atom. In the seventh I site, I(7) is bonded in a distorted T-shaped geometry to one Y(6) and two equivalent Y(5) atoms. In the eighth I site, I(8) is bonded in a 2-coordinate geometry to one Y(3) and one Y(5) atom. In the ninth I site, I(9) is bonded in a distorted L-shaped geometry to one Y(2) and one Y(5) atom. In the tenth I site, I(10) is bonded in a distorted bent 120 degrees geometry to one Y(1) and one Y(3) atom. In the eleventh I site, I(11) is bonded in a 3-coordinate geometry to one Y(5) and two equivalent Y(4) atoms. In the twelfth I site, I(12) is bonded to one Y(2), one Y(3), one Y(6), and one Y(7) atom to form distorted IY4 trigonal pyramids that share  a cornercorner with one N(1)Y4 tetrahedra and  an edgeedge with one N(1)Y4 tetrahedra.
Y7C2NI12 crystallizes in the triclinic P-1 space group. There are seven inequivalent Y sites. In the first Y site, Y(1) is bonded in a distorted single-bond geometry to one C(1), one C(2), one N(1), one I(1), one I(10), one I(4), and one I(5) atom. The Y(1)-C(1) bond length is 2.64 Å. The Y(1)-C(2) bond length is 2.64 Å. The Y(1)-N(1) bond length is 2.18 Å. The Y(1)-I(1) bond length is 3.14 Å. The Y(1)-I(10) bond length is 3.26 Å. The Y(1)-I(4) bond length is 3.16 Å. The Y(1)-I(5) bond length is 3.09 Å. In the second Y site, Y(2) is bonded to one C(1), one I(12), one I(2), one I(3), one I(4), and one I(9) atom to form distorted YCI5 octahedra that share  an edgeedge with one Y(6)CI5 octahedra and  an edgeedge with one Y(5)C2I5 pentagonal bipyramid. The Y(2)-C(1) bond length is 2.22 Å. The Y(2)-I(12) bond length is 3.41 Å. The Y(2)-I(2) bond length is 3.14 Å. The Y(2)-I(3) bond length is 3.04 Å. The Y(2)-I(4) bond length is 3.16 Å. The Y(2)-I(9) bond length is 2.98 Å. In the third Y site, Y(3) is bonded in a distorted single-bond geometry to one C(1), one C(2), one N(1), one I(10), one I(12), one I(2), and one I(8) atom. The Y(3)-C(1) bond length is 2.61 Å. The Y(3)-C(2) bond length is 2.64 Å. The Y(3)-N(1) bond length is 2.18 Å. The Y(3)-I(10) bond length is 3.25 Å. The Y(3)-I(12) bond length is 3.22 Å. The Y(3)-I(2) bond length is 3.13 Å. The Y(3)-I(8) bond length is 3.06 Å. In the fourth Y site, Y(4) is bonded in a 7-coordinate geometry to one C(1), one C(2), one I(3), one I(5), one I(6), and two equivalent I(11) atoms. The Y(4)-C(1) bond length is 2.52 Å. The Y(4)-C(2) bond length is 2.50 Å. The Y(4)-I(3) bond length is 3.24 Å. The Y(4)-I(5) bond length is 3.00 Å. The Y(4)-I(6) bond length is 3.07 Å. There is one shorter (3.05 Å) and one longer (3.50 Å) Y(4)-I(11) bond length. In the fifth Y site, Y(5) is bonded to one C(1), one C(2), one I(11), one I(8), one I(9), and two equivalent I(7) atoms to form distorted YC2I5 pentagonal bipyramids that share  a cornercorner with one Y(6)CI5 octahedra,  an edgeedge with one Y(2)CI5 octahedra,  an edgeedge with one Y(6)CI5 octahedra, and  an edgeedge with one Y(5)C2I5 pentagonal bipyramid. The corner-sharing octahedral tilt angles are 3°. The Y(5)-C(1) bond length is 2.52 Å. The Y(5)-C(2) bond length is 2.54 Å. The Y(5)-I(11) bond length is 3.08 Å. The Y(5)-I(8) bond length is 3.01 Å. The Y(5)-I(9) bond length is 3.09 Å. There is one shorter (3.16 Å) and one longer (3.42 Å) Y(5)-I(7) bond length. In the sixth Y site, Y(6) is bonded to one C(2), one I(1), one I(12), one I(3), one I(6), and one I(7) atom to form distorted YCI5 octahedra that share  a cornercorner with one Y(5)C2I5 pentagonal bipyramid,  an edgeedge with one Y(2)CI5 octahedra, and  an edgeedge with one Y(5)C2I5 pentagonal bipyramid. The Y(6)-C(2) bond length is 2.23 Å. The Y(6)-I(1) bond length is 3.14 Å. The Y(6)-I(12) bond length is 3.20 Å. The Y(6)-I(3) bond length is 3.37 Å. The Y(6)-I(6) bond length is 2.98 Å. The Y(6)-I(7) bond length is 3.07 Å. In the seventh Y site, Y(7) is bonded in a 2-coordinate geometry to two equivalent N(1), one I(1), one I(12), one I(2), and one I(4) atom. There is one shorter (2.21 Å) and one longer (2.22 Å) Y(7)-N(1) bond length. The Y(7)-I(1) bond length is 3.31 Å. The Y(7)-I(12) bond length is 3.38 Å. The Y(7)-I(2) bond length is 3.30 Å. The Y(7)-I(4) bond length is 3.30 Å. There are two inequivalent C sites. In the first C site, C(1) is bonded in a 6-coordinate geometry to one Y(1), one Y(2), one Y(3), one Y(4), one Y(5), and one C(2) atom. The C(1)-C(2) bond length is 1.43 Å. In the second C site, C(2) is bonded in a 6-coordinate geometry to one Y(1), one Y(3), one Y(4), one Y(5), one Y(6), and one C(1) atom. N(1) is bonded to one Y(1), one Y(3), and two equivalent Y(7) atoms to form NY4 tetrahedra that share  a cornercorner with one I(12)Y4 trigonal pyramid,  an edgeedge with one N(1)Y4 tetrahedra, and  an edgeedge with one I(12)Y4 trigonal pyramid. There are twelve inequivalent I sites. In the first I site, I(1) is bonded in a 3-coordinate geometry to one Y(1), one Y(6), and one Y(7) atom. In the second I site, I(2) is bonded in a distorted T-shaped geometry to one Y(2), one Y(3), and one Y(7) atom. In the third I site, I(3) is bonded in a T-shaped geometry to one Y(2), one Y(4), and one Y(6) atom. In the fourth I site, I(4) is bonded in a distorted T-shaped geometry to one Y(1), one Y(2), and one Y(7) atom. In the fifth I site, I(5) is bonded in a 2-coordinate geometry to one Y(1) and one Y(4) atom. In the sixth I site, I(6) is bonded in a distorted L-shaped geometry to one Y(4) and one Y(6) atom. In the seventh I site, I(7) is bonded in a distorted T-shaped geometry to one Y(6) and two equivalent Y(5) atoms. In the eighth I site, I(8) is bonded in a 2-coordinate geometry to one Y(3) and one Y(5) atom. In the ninth I site, I(9) is bonded in a distorted L-shaped geometry to one Y(2) and one Y(5) atom. In the tenth I site, I(10) is bonded in a distorted bent 120 degrees geometry to one Y(1) and one Y(3) atom. In the eleventh I site, I(11) is bonded in a 3-coordinate geometry to one Y(5) and two equivalent Y(4) atoms. In the twelfth I site, I(12) is bonded to one Y(2), one Y(3), one Y(6), and one Y(7) atom to form distorted IY4 trigonal pyramids that share  a cornercorner with one N(1)Y4 tetrahedra and  an edgeedge with one N(1)Y4 tetrahedra.