K2CoBr4 crystallizes in the orthorhombic Pnma space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 7-coordinate geometry to one Br(2), two equivalent Br(3), and four equivalent Br(1) atoms. In the second K site, K(2) is bonded in a 8-coordinate geometry to one Br(2), three equivalent Br(3), and four equivalent Br(1) atoms. Co(1) is bonded in a tetrahedral geometry to one Br(2), one Br(3), and two equivalent Br(1) atoms. There are three inequivalent Br sites. In the first Br site, Br(1) is bonded to two equivalent K(1), two equivalent K(2), and one Co(1) atom to form a mixture of distorted edge, corner, and face-sharing BrK4Co square pyramids. In the second Br site, Br(2) is bonded in a distorted T-shaped geometry to one K(1), one K(2), and one Co(1) atom. In the third Br site, Br(3) is bonded in a 6-coordinate geometry to two equivalent K(1), three equivalent K(2), and one Co(1) atom.
K2CoBr4 crystallizes in the orthorhombic Pnma space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 7-coordinate geometry to one Br(2), two equivalent Br(3), and four equivalent Br(1) atoms. The K(1)-Br(2) bond length is 3.40 Å. There is one shorter (3.28 Å) and one longer (3.42 Å) K(1)-Br(3) bond length. There are two shorter (3.39 Å) and two longer (3.49 Å) K(1)-Br(1) bond lengths. In the second K site, K(2) is bonded in a 8-coordinate geometry to one Br(2), three equivalent Br(3), and four equivalent Br(1) atoms. The K(2)-Br(2) bond length is 3.29 Å. There is one shorter (3.60 Å) and two longer (3.83 Å) K(2)-Br(3) bond lengths. There are two shorter (3.47 Å) and two longer (3.52 Å) K(2)-Br(1) bond lengths. Co(1) is bonded in a tetrahedral geometry to one Br(2), one Br(3), and two equivalent Br(1) atoms. The Co(1)-Br(2) bond length is 2.38 Å. The Co(1)-Br(3) bond length is 2.40 Å. Both Co(1)-Br(1) bond lengths are 2.39 Å. There are three inequivalent Br sites. In the first Br site, Br(1) is bonded to two equivalent K(1), two equivalent K(2), and one Co(1) atom to form a mixture of distorted edge, corner, and face-sharing BrK4Co square pyramids. In the second Br site, Br(2) is bonded in a distorted T-shaped geometry to one K(1), one K(2), and one Co(1) atom. In the third Br site, Br(3) is bonded in a 6-coordinate geometry to two equivalent K(1), three equivalent K(2), and one Co(1) atom.