Nd4CrS7 crystallizes in the monoclinic P2_1 space group. There are four inequivalent Nd sites. In the first Nd site, Nd(1) is bonded to two equivalent S(1), two equivalent S(2), and two equivalent S(3) atoms to form face-sharing NdS6 octahedra. In the second Nd site, Nd(2) is bonded in a 8-coordinate geometry to one S(2), one S(3), one S(4), one S(7), two equivalent S(1), and two equivalent S(5) atoms. In the third Nd site, Nd(3) is bonded in a 8-coordinate geometry to one S(1), one S(3), one S(5), one S(7), two equivalent S(2), and two equivalent S(6) atoms. In the fourth Nd site, Nd(4) is bonded in a 8-coordinate geometry to one S(1), one S(2), one S(6), one S(7), two equivalent S(3), and two equivalent S(4) atoms. Cr(1) is bonded in a tetrahedral geometry to one S(4), one S(5), one S(6), and one S(7) atom. There are seven inequivalent S sites. In the first S site, S(1) is bonded in a 6-coordinate geometry to one Nd(3), one Nd(4), two equivalent Nd(1), and two equivalent Nd(2) atoms. In the second S site, S(2) is bonded in a 6-coordinate geometry to one Nd(2), one Nd(4), two equivalent Nd(1), and two equivalent Nd(3) atoms. In the third S site, S(3) is bonded in a 6-coordinate geometry to one Nd(2), one Nd(3), two equivalent Nd(1), and two equivalent Nd(4) atoms. In the fourth S site, S(4) is bonded in a rectangular see-saw-like geometry to one Nd(2), two equivalent Nd(4), and one Cr(1) atom. In the fifth S site, S(5) is bonded in a rectangular see-saw-like geometry to one Nd(3), two equivalent Nd(2), and one Cr(1) atom. In the sixth S site, S(6) is bonded in a rectangular see-saw-like geometry to one Nd(4), two equivalent Nd(3), and one Cr(1) atom. In the seventh S site, S(7) is bonded in a distorted tetrahedral geometry to one Nd(2), one Nd(3), one Nd(4), and one Cr(1) atom.
Nd4CrS7 crystallizes in the monoclinic P2_1 space group. There are four inequivalent Nd sites. In the first Nd site, Nd(1) is bonded to two equivalent S(1), two equivalent S(2), and two equivalent S(3) atoms to form face-sharing NdS6 octahedra. There is one shorter (2.80 Å) and one longer (2.82 Å) Nd(1)-S(1) bond length. There is one shorter (2.80 Å) and one longer (2.82 Å) Nd(1)-S(2) bond length. There is one shorter (2.82 Å) and one longer (2.83 Å) Nd(1)-S(3) bond length. In the second Nd site, Nd(2) is bonded in a 8-coordinate geometry to one S(2), one S(3), one S(4), one S(7), two equivalent S(1), and two equivalent S(5) atoms. The Nd(2)-S(2) bond length is 3.12 Å. The Nd(2)-S(3) bond length is 3.14 Å. The Nd(2)-S(4) bond length is 2.93 Å. The Nd(2)-S(7) bond length is 2.83 Å. There is one shorter (3.31 Å) and one longer (3.63 Å) Nd(2)-S(1) bond length. There is one shorter (2.77 Å) and one longer (3.01 Å) Nd(2)-S(5) bond length. In the third Nd site, Nd(3) is bonded in a 8-coordinate geometry to one S(1), one S(3), one S(5), one S(7), two equivalent S(2), and two equivalent S(6) atoms. The Nd(3)-S(1) bond length is 3.13 Å. The Nd(3)-S(3) bond length is 3.12 Å. The Nd(3)-S(5) bond length is 2.92 Å. The Nd(3)-S(7) bond length is 2.82 Å. There is one shorter (3.31 Å) and one longer (3.63 Å) Nd(3)-S(2) bond length. There is one shorter (2.77 Å) and one longer (3.02 Å) Nd(3)-S(6) bond length. In the fourth Nd site, Nd(4) is bonded in a 8-coordinate geometry to one S(1), one S(2), one S(6), one S(7), two equivalent S(3), and two equivalent S(4) atoms. The Nd(4)-S(1) bond length is 3.11 Å. The Nd(4)-S(2) bond length is 3.14 Å. The Nd(4)-S(6) bond length is 2.93 Å. The Nd(4)-S(7) bond length is 2.82 Å. There is one shorter (3.31 Å) and one longer (3.63 Å) Nd(4)-S(3) bond length. There is one shorter (2.77 Å) and one longer (3.00 Å) Nd(4)-S(4) bond length. Cr(1) is bonded in a tetrahedral geometry to one S(4), one S(5), one S(6), and one S(7) atom. The Cr(1)-S(4) bond length is 2.33 Å. The Cr(1)-S(5) bond length is 2.35 Å. The Cr(1)-S(6) bond length is 2.33 Å. The Cr(1)-S(7) bond length is 2.40 Å. There are seven inequivalent S sites. In the first S site, S(1) is bonded in a 6-coordinate geometry to one Nd(3), one Nd(4), two equivalent Nd(1), and two equivalent Nd(2) atoms. In the second S site, S(2) is bonded in a 6-coordinate geometry to one Nd(2), one Nd(4), two equivalent Nd(1), and two equivalent Nd(3) atoms. In the third S site, S(3) is bonded in a 6-coordinate geometry to one Nd(2), one Nd(3), two equivalent Nd(1), and two equivalent Nd(4) atoms. In the fourth S site, S(4) is bonded in a rectangular see-saw-like geometry to one Nd(2), two equivalent Nd(4), and one Cr(1) atom. In the fifth S site, S(5) is bonded in a rectangular see-saw-like geometry to one Nd(3), two equivalent Nd(2), and one Cr(1) atom. In the sixth S site, S(6) is bonded in a rectangular see-saw-like geometry to one Nd(4), two equivalent Nd(3), and one Cr(1) atom. In the seventh S site, S(7) is bonded in a distorted tetrahedral geometry to one Nd(2), one Nd(3), one Nd(4), and one Cr(1) atom.