KGdGeS4 crystallizes in the monoclinic P2_1 space group. K(1) is bonded in a 8-coordinate geometry to one S(1), two equivalent S(3), two equivalent S(4), and three equivalent S(2) atoms. Gd(1) is bonded in a 7-coordinate geometry to one S(2), two equivalent S(1), two equivalent S(3), and two equivalent S(4) atoms. Ge(1) is bonded in a tetrahedral 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 distorted see-saw-like geometry to one K(1), two equivalent Gd(1), and one Ge(1) atom. In the second S site, S(2) is bonded in a 5-coordinate geometry to three equivalent K(1), one Gd(1), and one Ge(1) atom. In the third S site, S(3) is bonded in a 5-coordinate geometry to two equivalent K(1), two equivalent Gd(1), and one Ge(1) atom. In the fourth S site, S(4) is bonded to two equivalent K(1), two equivalent Gd(1), and one Ge(1) atom to form distorted corner-sharing SK2Gd2Ge square pyramids.
KGdGeS4 crystallizes in the monoclinic P2_1 space group. K(1) is bonded in a 8-coordinate geometry to one S(1), two equivalent S(3), two equivalent S(4), and three equivalent S(2) atoms. The K(1)-S(1) bond length is 3.25 Å. There is one shorter (3.38 Å) and one longer (3.59 Å) K(1)-S(3) bond length. Both K(1)-S(4) bond lengths are 3.44 Å. There are a spread of K(1)-S(2) bond distances ranging from 3.20-3.68 Å. Gd(1) is bonded in a 7-coordinate geometry to one S(2), two equivalent S(1), two equivalent S(3), and two equivalent S(4) atoms. The Gd(1)-S(2) bond length is 2.82 Å. There is one shorter (2.83 Å) and one longer (3.02 Å) Gd(1)-S(1) bond length. Both Gd(1)-S(3) bond lengths are 2.87 Å. There is one shorter (2.89 Å) and one longer (2.93 Å) Gd(1)-S(4) bond length. Ge(1) is bonded in a tetrahedral geometry to one S(1), one S(2), one S(3), and one S(4) atom. The Ge(1)-S(1) bond length is 2.23 Å. The Ge(1)-S(2) bond length is 2.20 Å. The Ge(1)-S(3) bond length is 2.24 Å. The Ge(1)-S(4) bond length is 2.24 Å. There are four inequivalent S sites. In the first S site, S(1) is bonded in a distorted see-saw-like geometry to one K(1), two equivalent Gd(1), and one Ge(1) atom. In the second S site, S(2) is bonded in a 5-coordinate geometry to three equivalent K(1), one Gd(1), and one Ge(1) atom. In the third S site, S(3) is bonded in a 5-coordinate geometry to two equivalent K(1), two equivalent Gd(1), and one Ge(1) atom. In the fourth S site, S(4) is bonded to two equivalent K(1), two equivalent Gd(1), and one Ge(1) atom to form distorted corner-sharing SK2Gd2Ge square pyramids.