Nd6Cd(SiS7)2 crystallizes in the trigonal P3 space group. There are two inequivalent Nd sites. In the first Nd site, Nd(1) is bonded in a 8-coordinate geometry to one S(3), one S(6), two equivalent S(1), two equivalent S(2), and two equivalent S(5) atoms. In the second Nd site, Nd(2) is bonded in a 8-coordinate geometry to one S(4), one S(5), two equivalent S(1), two equivalent S(2), and two equivalent S(6) atoms. Cd(1) is bonded in an octahedral geometry to three equivalent S(1) and three equivalent S(2) atoms. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded in a tetrahedral geometry to one S(3) and three equivalent S(5) atoms. In the second Si site, Si(2) is bonded in a tetrahedral geometry to one S(4) and three equivalent S(6) atoms. There are six inequivalent S sites. In the first S site, S(1) is bonded to two equivalent Nd(1), two equivalent Nd(2), and one Cd(1) atom to form distorted SNd4Cd trigonal bipyramids that share corners with two equivalent S(3)Nd3Si tetrahedra, corners with two equivalent S(4)Nd3Si tetrahedra,  a cornercorner with one S(2)Nd4Cd trigonal bipyramid, corners with two equivalent S(1)Nd4Cd trigonal bipyramids, edges with two equivalent S(1)Nd4Cd trigonal bipyramids, edges with two equivalent S(2)Nd4Cd trigonal bipyramids, and faces with two equivalent S(2)Nd4Cd trigonal bipyramids. In the second S site, S(2) is bonded to two equivalent Nd(1), two equivalent Nd(2), and one Cd(1) atom to form distorted SNd4Cd trigonal bipyramids that share corners with two equivalent S(3)Nd3Si tetrahedra, corners with two equivalent S(4)Nd3Si tetrahedra,  a cornercorner with one S(1)Nd4Cd trigonal bipyramid, corners with two equivalent S(2)Nd4Cd trigonal bipyramids, edges with two equivalent S(1)Nd4Cd trigonal bipyramids, edges with two equivalent S(2)Nd4Cd trigonal bipyramids, and faces with two equivalent S(1)Nd4Cd trigonal bipyramids. In the third S site, S(3) is bonded to three equivalent Nd(1) and one Si(1) atom to form distorted corner-sharing SNd3Si tetrahedra. In the fourth S site, S(4) is bonded to three equivalent Nd(2) and one Si(2) atom to form distorted corner-sharing SNd3Si tetrahedra. In the fifth S site, S(5) is bonded in a distorted rectangular see-saw-like geometry to one Nd(2), two equivalent Nd(1), and one Si(1) atom. In the sixth S site, S(6) is bonded in a distorted rectangular see-saw-like geometry to one Nd(1), two equivalent Nd(2), and one Si(2) atom.
Nd6Cd(SiS7)2 crystallizes in the trigonal P3 space group. There are two inequivalent Nd sites. In the first Nd site, Nd(1) is bonded in a 8-coordinate geometry to one S(3), one S(6), two equivalent S(1), two equivalent S(2), and two equivalent S(5) atoms. The Nd(1)-S(3) bond length is 3.08 Å. The Nd(1)-S(6) bond length is 3.05 Å. There is one shorter (2.92 Å) and one longer (3.08 Å) Nd(1)-S(1) bond length. There is one shorter (2.87 Å) and one longer (2.91 Å) Nd(1)-S(2) bond length. There is one shorter (2.89 Å) and one longer (2.98 Å) Nd(1)-S(5) bond length. In the second Nd site, Nd(2) is bonded in a 8-coordinate geometry to one S(4), one S(5), two equivalent S(1), two equivalent S(2), and two equivalent S(6) atoms. The Nd(2)-S(4) bond length is 3.07 Å. The Nd(2)-S(5) bond length is 3.03 Å. Both Nd(2)-S(1) bond lengths are 2.90 Å. There is one shorter (2.96 Å) and one longer (3.05 Å) Nd(2)-S(2) bond length. There is one shorter (2.88 Å) and one longer (2.98 Å) Nd(2)-S(6) bond length. Cd(1) is bonded in an octahedral geometry to three equivalent S(1) and three equivalent S(2) atoms. All Cd(1)-S(1) bond lengths are 2.68 Å. All Cd(1)-S(2) bond lengths are 2.75 Å. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded in a tetrahedral geometry to one S(3) and three equivalent S(5) atoms. The Si(1)-S(3) bond length is 2.10 Å. All Si(1)-S(5) bond lengths are 2.15 Å. In the second Si site, Si(2) is bonded in a tetrahedral geometry to one S(4) and three equivalent S(6) atoms. The Si(2)-S(4) bond length is 2.11 Å. All Si(2)-S(6) bond lengths are 2.15 Å. There are six inequivalent S sites. In the first S site, S(1) is bonded to two equivalent Nd(1), two equivalent Nd(2), and one Cd(1) atom to form distorted SNd4Cd trigonal bipyramids that share corners with two equivalent S(3)Nd3Si tetrahedra, corners with two equivalent S(4)Nd3Si tetrahedra,  a cornercorner with one S(2)Nd4Cd trigonal bipyramid, corners with two equivalent S(1)Nd4Cd trigonal bipyramids, edges with two equivalent S(1)Nd4Cd trigonal bipyramids, edges with two equivalent S(2)Nd4Cd trigonal bipyramids, and faces with two equivalent S(2)Nd4Cd trigonal bipyramids. In the second S site, S(2) is bonded to two equivalent Nd(1), two equivalent Nd(2), and one Cd(1) atom to form distorted SNd4Cd trigonal bipyramids that share corners with two equivalent S(3)Nd3Si tetrahedra, corners with two equivalent S(4)Nd3Si tetrahedra,  a cornercorner with one S(1)Nd4Cd trigonal bipyramid, corners with two equivalent S(2)Nd4Cd trigonal bipyramids, edges with two equivalent S(1)Nd4Cd trigonal bipyramids, edges with two equivalent S(2)Nd4Cd trigonal bipyramids, and faces with two equivalent S(1)Nd4Cd trigonal bipyramids. In the third S site, S(3) is bonded to three equivalent Nd(1) and one Si(1) atom to form distorted corner-sharing SNd3Si tetrahedra. In the fourth S site, S(4) is bonded to three equivalent Nd(2) and one Si(2) atom to form distorted corner-sharing SNd3Si tetrahedra. In the fifth S site, S(5) is bonded in a distorted rectangular see-saw-like geometry to one Nd(2), two equivalent Nd(1), and one Si(1) atom. In the sixth S site, S(6) is bonded in a distorted rectangular see-saw-like geometry to one Nd(1), two equivalent Nd(2), and one Si(2) atom.