La4CoS7 crystallizes in the monoclinic P2_1 space group. There are four inequivalent La sites. In the first La site, La(1) is bonded in a 7-coordinate geometry to one S(1), one S(2), one S(3), one S(4), one S(7), and two equivalent S(5) atoms. In the second La site, La(2) is bonded in a 7-coordinate geometry to one S(1), one S(2), one S(3), one S(5), one S(7), and two equivalent S(6) atoms. In the third La site, La(3) is bonded in a 7-coordinate geometry to one S(1), one S(2), one S(3), one S(6), one S(7), and two equivalent S(4) atoms. In the fourth La site, La(4) is bonded in a rectangular see-saw-like geometry to one S(4), one S(5), one S(6), and one S(7) atom. Co(1) is bonded in a 3-coordinate geometry to one S(1), one S(2), and two equivalent S(3) atoms. There are seven inequivalent S sites. In the first S site, S(1) is bonded in a 4-coordinate geometry to one La(1), one La(2), one La(3), and one Co(1) atom. In the second S site, S(2) is bonded in a 4-coordinate geometry to one La(1), one La(2), one La(3), and one Co(1) atom. In the third S site, S(3) is bonded in a 5-coordinate geometry to one La(1), one La(2), one La(3), and two equivalent Co(1) atoms. In the fourth S site, S(4) is bonded in a distorted rectangular see-saw-like geometry to one La(1), one La(4), and two equivalent La(3) atoms. In the fifth S site, S(5) is bonded in a distorted rectangular see-saw-like geometry to one La(2), one La(4), and two equivalent La(1) atoms. In the sixth S site, S(6) is bonded in a distorted rectangular see-saw-like geometry to one La(3), one La(4), and two equivalent La(2) atoms. In the seventh S site, S(7) is bonded in a tetrahedral geometry to one La(1), one La(2), one La(3), and one La(4) atom.
La4CoS7 crystallizes in the monoclinic P2_1 space group. There are four inequivalent La sites. In the first La site, La(1) is bonded in a 7-coordinate geometry to one S(1), one S(2), one S(3), one S(4), one S(7), and two equivalent S(5) atoms. The La(1)-S(1) bond length is 2.98 Å. The La(1)-S(2) bond length is 2.89 Å. The La(1)-S(3) bond length is 2.97 Å. The La(1)-S(4) bond length is 3.00 Å. The La(1)-S(7) bond length is 2.77 Å. There is one shorter (2.92 Å) and one longer (3.21 Å) La(1)-S(5) bond length. In the second La site, La(2) is bonded in a 7-coordinate geometry to one S(1), one S(2), one S(3), one S(5), one S(7), and two equivalent S(6) atoms. The La(2)-S(1) bond length is 2.98 Å. The La(2)-S(2) bond length is 2.98 Å. The La(2)-S(3) bond length is 2.89 Å. The La(2)-S(5) bond length is 3.00 Å. The La(2)-S(7) bond length is 2.77 Å. There is one shorter (2.91 Å) and one longer (3.21 Å) La(2)-S(6) bond length. In the third La site, La(3) is bonded in a 7-coordinate geometry to one S(1), one S(2), one S(3), one S(6), one S(7), and two equivalent S(4) atoms. The La(3)-S(1) bond length is 2.88 Å. The La(3)-S(2) bond length is 2.97 Å. The La(3)-S(3) bond length is 3.02 Å. The La(3)-S(6) bond length is 3.02 Å. The La(3)-S(7) bond length is 2.76 Å. There is one shorter (2.92 Å) and one longer (3.20 Å) La(3)-S(4) bond length. In the fourth La site, La(4) is bonded in a rectangular see-saw-like geometry to one S(4), one S(5), one S(6), and one S(7) atom. The La(4)-S(4) bond length is 2.74 Å. The La(4)-S(5) bond length is 2.74 Å. The La(4)-S(6) bond length is 2.74 Å. The La(4)-S(7) bond length is 2.70 Å. Co(1) is bonded in a 3-coordinate geometry to one S(1), one S(2), and two equivalent S(3) atoms. The Co(1)-S(1) bond length is 2.32 Å. The Co(1)-S(2) bond length is 2.30 Å. There is one shorter (2.32 Å) and one longer (3.01 Å) Co(1)-S(3) bond length. There are seven inequivalent S sites. In the first S site, S(1) is bonded in a 4-coordinate geometry to one La(1), one La(2), one La(3), and one Co(1) atom. In the second S site, S(2) is bonded in a 4-coordinate geometry to one La(1), one La(2), one La(3), and one Co(1) atom. In the third S site, S(3) is bonded in a 5-coordinate geometry to one La(1), one La(2), one La(3), and two equivalent Co(1) atoms. In the fourth S site, S(4) is bonded in a distorted rectangular see-saw-like geometry to one La(1), one La(4), and two equivalent La(3) atoms. In the fifth S site, S(5) is bonded in a distorted rectangular see-saw-like geometry to one La(2), one La(4), and two equivalent La(1) atoms. In the sixth S site, S(6) is bonded in a distorted rectangular see-saw-like geometry to one La(3), one La(4), and two equivalent La(2) atoms. In the seventh S site, S(7) is bonded in a tetrahedral geometry to one La(1), one La(2), one La(3), and one La(4) atom.