La2CuS4 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent La sites. In the first La site, La(1) is bonded in a 8-coordinate geometry to one S(4), two equivalent S(3), three equivalent S(1), and three equivalent S(2) atoms. In the second La site, La(2) is bonded in a 8-coordinate geometry to one S(1), two equivalent S(2), two equivalent S(3), and three equivalent S(4) atoms. Cu(1) is bonded in a distorted trigonal planar geometry to one S(1), one S(2), one S(3), and one S(4) atom. There are four inequivalent S sites. In the first S site, S(1) is bonded in a 6-coordinate geometry to one La(2), three equivalent La(1), one Cu(1), and one S(1) atom. In the second S site, S(2) is bonded in a 6-coordinate geometry to two equivalent La(2), three equivalent La(1), and one Cu(1) atom. In the third S site, S(3) is bonded to two equivalent La(1), two equivalent La(2), and one Cu(1) atom to form a mixture of distorted corner and edge-sharing SLa4Cu trigonal bipyramids. In the fourth S site, S(4) is bonded to one La(1), three equivalent La(2), and one Cu(1) atom to form a mixture of corner and edge-sharing SLa4Cu trigonal bipyramids.
La2CuS4 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent La sites. In the first La site, La(1) is bonded in a 8-coordinate geometry to one S(4), two equivalent S(3), three equivalent S(1), and three equivalent S(2) atoms. The La(1)-S(4) bond length is 2.98 Å. There is one shorter (2.93 Å) and one longer (2.94 Å) La(1)-S(3) bond length. There are a spread of La(1)-S(1) bond distances ranging from 2.93-3.73 Å. There are a spread of La(1)-S(2) bond distances ranging from 2.96-3.52 Å. In the second La site, La(2) is bonded in a 8-coordinate geometry to one S(1), two equivalent S(2), two equivalent S(3), and three equivalent S(4) atoms. The La(2)-S(1) bond length is 3.38 Å. There is one shorter (3.04 Å) and one longer (3.22 Å) La(2)-S(2) bond length. There is one shorter (2.95 Å) and one longer (2.97 Å) La(2)-S(3) bond length. There are a spread of La(2)-S(4) bond distances ranging from 2.86-2.92 Å. Cu(1) is bonded in a distorted trigonal planar geometry to one S(1), one S(2), one S(3), and one S(4) atom. The Cu(1)-S(1) bond length is 2.98 Å. The Cu(1)-S(2) bond length is 2.24 Å. The Cu(1)-S(3) bond length is 2.23 Å. The Cu(1)-S(4) bond length is 2.22 Å. There are four inequivalent S sites. In the first S site, S(1) is bonded in a 6-coordinate geometry to one La(2), three equivalent La(1), one Cu(1), and one S(1) atom. The S(1)-S(1) bond length is 2.10 Å. In the second S site, S(2) is bonded in a 6-coordinate geometry to two equivalent La(2), three equivalent La(1), and one Cu(1) atom. In the third S site, S(3) is bonded to two equivalent La(1), two equivalent La(2), and one Cu(1) atom to form a mixture of distorted corner and edge-sharing SLa4Cu trigonal bipyramids. In the fourth S site, S(4) is bonded to one La(1), three equivalent La(2), and one Cu(1) atom to form a mixture of corner and edge-sharing SLa4Cu trigonal bipyramids.