KPrGeSe4 crystallizes in the monoclinic P2_1 space group. K(1) is bonded in a 7-coordinate geometry to one Se(4), two equivalent Se(1), two equivalent Se(2), and two equivalent Se(3) atoms. Pr(1) is bonded in a 7-coordinate geometry to one Se(3), two equivalent Se(1), two equivalent Se(2), and two equivalent Se(4) atoms. Ge(1) is bonded in a tetrahedral geometry to one Se(1), one Se(2), one Se(3), and one Se(4) atom. There are four inequivalent Se sites. In the first Se site, Se(1) is bonded to two equivalent K(1), two equivalent Pr(1), and one Ge(1) atom to form a mixture of distorted edge, corner, and face-sharing SeK2Pr2Ge square pyramids. In the second Se site, Se(2) is bonded to two equivalent K(1), two equivalent Pr(1), and one Ge(1) atom to form a mixture of distorted edge, corner, and face-sharing SeK2Pr2Ge square pyramids. In the third Se site, Se(3) is bonded in a distorted see-saw-like geometry to two equivalent K(1), one Pr(1), and one Ge(1) atom. In the fourth Se site, Se(4) is bonded in a distorted see-saw-like geometry to one K(1), two equivalent Pr(1), and one Ge(1) atom.
KPrGeSe4 crystallizes in the monoclinic P2_1 space group. K(1) is bonded in a 7-coordinate geometry to one Se(4), two equivalent Se(1), two equivalent Se(2), and two equivalent Se(3) atoms. The K(1)-Se(4) bond length is 3.45 Å. There is one shorter (3.53 Å) and one longer (3.67 Å) K(1)-Se(1) bond length. There is one shorter (3.56 Å) and one longer (3.57 Å) K(1)-Se(2) bond length. There is one shorter (3.46 Å) and one longer (3.57 Å) K(1)-Se(3) bond length. Pr(1) is bonded in a 7-coordinate geometry to one Se(3), two equivalent Se(1), two equivalent Se(2), and two equivalent Se(4) atoms. The Pr(1)-Se(3) bond length is 3.03 Å. There is one shorter (3.05 Å) and one longer (3.09 Å) Pr(1)-Se(1) bond length. There is one shorter (3.11 Å) and one longer (3.13 Å) Pr(1)-Se(2) bond length. There is one shorter (3.06 Å) and one longer (3.17 Å) Pr(1)-Se(4) bond length. Ge(1) is bonded in a tetrahedral geometry to one Se(1), one Se(2), one Se(3), and one Se(4) atom. The Ge(1)-Se(1) bond length is 2.39 Å. The Ge(1)-Se(2) bond length is 2.39 Å. The Ge(1)-Se(3) bond length is 2.35 Å. The Ge(1)-Se(4) bond length is 2.38 Å. There are four inequivalent Se sites. In the first Se site, Se(1) is bonded to two equivalent K(1), two equivalent Pr(1), and one Ge(1) atom to form a mixture of distorted edge, corner, and face-sharing SeK2Pr2Ge square pyramids. In the second Se site, Se(2) is bonded to two equivalent K(1), two equivalent Pr(1), and one Ge(1) atom to form a mixture of distorted edge, corner, and face-sharing SeK2Pr2Ge square pyramids. In the third Se site, Se(3) is bonded in a distorted see-saw-like geometry to two equivalent K(1), one Pr(1), and one Ge(1) atom. In the fourth Se site, Se(4) is bonded in a distorted see-saw-like geometry to one K(1), two equivalent Pr(1), and one Ge(1) atom.