K2LaP2S7 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 9-coordinate geometry to one P(2), one S(1), one S(2), one S(4), one S(5), one S(6), one S(7), and two equivalent S(3) atoms. In the second K site, K(2) is bonded in a 9-coordinate geometry to one S(5), two equivalent S(1), two equivalent S(4), two equivalent S(6), and two equivalent S(7) atoms. La(1) is bonded in a 8-coordinate geometry to one S(1), one S(3), one S(4), one S(5), one S(6), one S(7), and two equivalent S(2) atoms. There are two inequivalent P sites. In the first P site, P(1) is bonded in a tetrahedral geometry to one S(2), one S(3), one S(4), and one S(7) atom. In the second P site, P(2) is bonded in a distorted trigonal non-coplanar geometry to one K(1), one S(1), one S(5), and one S(6) atom. There are seven inequivalent S sites. In the first S site, S(4) is bonded in a 4-coordinate geometry to one K(1), two equivalent K(2), one La(1), and one P(1) atom. In the second S site, S(5) is bonded in a 4-coordinate geometry to one K(1), one K(2), one La(1), and one P(2) atom. In the third S site, S(6) is bonded in a 5-coordinate geometry to one K(1), two equivalent K(2), one La(1), and one P(2) atom. In the fourth S site, S(7) is bonded in a 5-coordinate geometry to one K(1), two equivalent K(2), one La(1), and one P(1) atom. In the fifth S site, S(1) is bonded in a 1-coordinate geometry to one K(1), two equivalent K(2), one La(1), and one P(2) atom. In the sixth S site, S(2) is bonded in a distorted see-saw-like geometry to one K(1), two equivalent La(1), and one P(1) atom. In the seventh S site, S(3) is bonded in a distorted see-saw-like geometry to two equivalent K(1), one La(1), and one P(1) atom.
K2LaP2S7 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 9-coordinate geometry to one P(2), one S(1), one S(2), one S(4), one S(5), one S(6), one S(7), and two equivalent S(3) atoms. The K(1)-P(2) bond length is 3.63 Å. The K(1)-S(1) bond length is 3.73 Å. The K(1)-S(2) bond length is 3.56 Å. The K(1)-S(4) bond length is 3.36 Å. The K(1)-S(5) bond length is 3.58 Å. The K(1)-S(6) bond length is 3.66 Å. The K(1)-S(7) bond length is 3.24 Å. There is one shorter (3.34 Å) and one longer (3.44 Å) K(1)-S(3) bond length. In the second K site, K(2) is bonded in a 9-coordinate geometry to one S(5), two equivalent S(1), two equivalent S(4), two equivalent S(6), and two equivalent S(7) atoms. The K(2)-S(5) bond length is 3.28 Å. There is one shorter (3.32 Å) and one longer (3.62 Å) K(2)-S(1) bond length. There is one shorter (3.30 Å) and one longer (3.81 Å) K(2)-S(4) bond length. There is one shorter (3.48 Å) and one longer (3.66 Å) K(2)-S(6) bond length. There is one shorter (3.49 Å) and one longer (3.66 Å) K(2)-S(7) bond length. La(1) is bonded in a 8-coordinate geometry to one S(1), one S(3), one S(4), one S(5), one S(6), one S(7), and two equivalent S(2) atoms. The La(1)-S(1) bond length is 3.18 Å. The La(1)-S(3) bond length is 2.93 Å. The La(1)-S(4) bond length is 3.00 Å. The La(1)-S(5) bond length is 3.00 Å. The La(1)-S(6) bond length is 3.05 Å. The La(1)-S(7) bond length is 2.99 Å. There is one shorter (3.06 Å) and one longer (3.10 Å) La(1)-S(2) bond length. There are two inequivalent P sites. In the first P site, P(1) is bonded in a tetrahedral geometry to one S(2), one S(3), one S(4), and one S(7) atom. The P(1)-S(2) bond length is 2.07 Å. The P(1)-S(3) bond length is 2.06 Å. The P(1)-S(4) bond length is 2.05 Å. The P(1)-S(7) bond length is 2.04 Å. In the second P site, P(2) is bonded in a distorted trigonal non-coplanar geometry to one K(1), one S(1), one S(5), and one S(6) atom. The P(2)-S(1) bond length is 2.02 Å. The P(2)-S(5) bond length is 2.04 Å. The P(2)-S(6) bond length is 2.04 Å. There are seven inequivalent S sites. In the first S site, S(4) is bonded in a 4-coordinate geometry to one K(1), two equivalent K(2), one La(1), and one P(1) atom. In the second S site, S(5) is bonded in a 4-coordinate geometry to one K(1), one K(2), one La(1), and one P(2) atom. In the third S site, S(6) is bonded in a 5-coordinate geometry to one K(1), two equivalent K(2), one La(1), and one P(2) atom. In the fourth S site, S(7) is bonded in a 5-coordinate geometry to one K(1), two equivalent K(2), one La(1), and one P(1) atom. In the fifth S site, S(1) is bonded in a 1-coordinate geometry to one K(1), two equivalent K(2), one La(1), and one P(2) atom. In the sixth S site, S(2) is bonded in a distorted see-saw-like geometry to one K(1), two equivalent La(1), and one P(1) atom. In the seventh S site, S(3) is bonded in a distorted see-saw-like geometry to two equivalent K(1), one La(1), and one P(1) atom.