K2ZnBr4 crystallizes in the monoclinic P2_1/m space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 8-coordinate geometry to one Br(1), three equivalent Br(2), and four equivalent Br(3) atoms. In the second K site, K(2) is bonded in a 6-coordinate geometry to one Br(1), one Br(2), and four equivalent Br(3) atoms. Zn(1) is bonded in a tetrahedral geometry to one Br(1), one Br(2), and two equivalent Br(3) atoms. There are three inequivalent Br sites. In the first Br site, Br(1) is bonded in a distorted T-shaped geometry to one K(1), one K(2), and one Zn(1) atom. In the second Br site, Br(2) is bonded in a 3-coordinate geometry to one K(2), three equivalent K(1), and one Zn(1) atom. In the third Br site, Br(3) is bonded to two equivalent K(1), two equivalent K(2), and one Zn(1) atom to form a mixture of distorted edge, corner, and face-sharing BrK4Zn square pyramids.
K2ZnBr4 crystallizes in the monoclinic P2_1/m space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 8-coordinate geometry to one Br(1), three equivalent Br(2), and four equivalent Br(3) atoms. The K(1)-Br(1) bond length is 3.37 Å. There is one shorter (3.30 Å) and two longer (3.87 Å) K(1)-Br(2) bond lengths. There are two shorter (3.38 Å) and two longer (3.43 Å) K(1)-Br(3) bond lengths. In the second K site, K(2) is bonded in a 6-coordinate geometry to one Br(1), one Br(2), and four equivalent Br(3) atoms. The K(2)-Br(1) bond length is 3.36 Å. The K(2)-Br(2) bond length is 3.26 Å. There are two shorter (3.32 Å) and two longer (3.43 Å) K(2)-Br(3) bond lengths. Zn(1) is bonded in a tetrahedral geometry to one Br(1), one Br(2), and two equivalent Br(3) atoms. The Zn(1)-Br(1) bond length is 2.41 Å. The Zn(1)-Br(2) bond length is 2.40 Å. Both Zn(1)-Br(3) bond lengths are 2.42 Å. There are three inequivalent Br sites. In the first Br site, Br(1) is bonded in a distorted T-shaped geometry to one K(1), one K(2), and one Zn(1) atom. In the second Br site, Br(2) is bonded in a 3-coordinate geometry to one K(2), three equivalent K(1), and one Zn(1) atom. In the third Br site, Br(3) is bonded to two equivalent K(1), two equivalent K(2), and one Zn(1) atom to form a mixture of distorted edge, corner, and face-sharing BrK4Zn square pyramids.