K2PrBr5 crystallizes in the orthorhombic Pnma space group. K(1) is bonded in a 8-coordinate geometry to two equivalent Br(1), two equivalent Br(2), two equivalent Br(3), and two equivalent Br(4) atoms. Pr(1) is bonded to one Br(1), one Br(3), one Br(4), and four equivalent Br(2) atoms to form distorted edge-sharing PrBr7 pentagonal bipyramids. There are four inequivalent Br sites. In the first Br site, Br(1) is bonded to four equivalent K(1) and one Pr(1) atom to form BrK4Pr trigonal bipyramids that share corners with four equivalent Br(3)K4Pr trigonal bipyramids, corners with five equivalent Br(4)K4Pr trigonal bipyramids, corners with eight equivalent Br(2)K2Pr2 trigonal pyramids,  an edgeedge with one Br(3)K4Pr trigonal bipyramid, edges with two equivalent Br(1)K4Pr trigonal bipyramids, edges with two equivalent Br(4)K4Pr trigonal bipyramids, edges with two equivalent Br(2)K2Pr2 trigonal pyramids, and  a faceface with one Br(3)K4Pr trigonal bipyramid. In the second Br site, Br(2) is bonded to two equivalent K(1) and two equivalent Pr(1) atoms to form distorted BrK2Pr2 trigonal pyramids that share corners with two equivalent Br(3)K4Pr trigonal bipyramids, corners with two equivalent Br(4)K4Pr trigonal bipyramids, corners with four equivalent Br(1)K4Pr trigonal bipyramids, corners with six equivalent Br(2)K2Pr2 trigonal pyramids,  an edgeedge with one Br(1)K4Pr trigonal bipyramid, edges with two equivalent Br(3)K4Pr trigonal bipyramids, edges with two equivalent Br(4)K4Pr trigonal bipyramids, and  an edgeedge with one Br(2)K2Pr2 trigonal pyramid. In the third Br site, Br(3) is bonded to four equivalent K(1) and one Pr(1) atom to form BrK4Pr trigonal bipyramids that share  a cornercorner with one Br(4)K4Pr trigonal bipyramid, corners with four equivalent Br(1)K4Pr trigonal bipyramids, corners with four equivalent Br(3)K4Pr trigonal bipyramids, corners with four equivalent Br(2)K2Pr2 trigonal pyramids,  an edgeedge with one Br(1)K4Pr trigonal bipyramid, edges with four equivalent Br(4)K4Pr trigonal bipyramids, edges with four equivalent Br(2)K2Pr2 trigonal pyramids, and  a faceface with one Br(1)K4Pr trigonal bipyramid. In the fourth Br site, Br(4) is bonded to four equivalent K(1) and one Pr(1) atom to form distorted BrK4Pr trigonal bipyramids that share  a cornercorner with one Br(3)K4Pr trigonal bipyramid, corners with four equivalent Br(4)K4Pr trigonal bipyramids, corners with five equivalent Br(1)K4Pr trigonal bipyramids, corners with four equivalent Br(2)K2Pr2 trigonal pyramids, edges with two equivalent Br(1)K4Pr trigonal bipyramids, edges with four equivalent Br(3)K4Pr trigonal bipyramids, and edges with four equivalent Br(2)K2Pr2 trigonal pyramids.
K2PrBr5 crystallizes in the orthorhombic Pnma space group. K(1) is bonded in a 8-coordinate geometry to two equivalent Br(1), two equivalent Br(2), two equivalent Br(3), and two equivalent Br(4) atoms. There is one shorter (3.34 Å) and one longer (3.36 Å) K(1)-Br(1) bond length. There is one shorter (3.51 Å) and one longer (3.55 Å) K(1)-Br(2) bond length. There is one shorter (3.34 Å) and one longer (3.38 Å) K(1)-Br(3) bond length. There is one shorter (3.42 Å) and one longer (3.51 Å) K(1)-Br(4) bond length. Pr(1) is bonded to one Br(1), one Br(3), one Br(4), and four equivalent Br(2) atoms to form distorted edge-sharing PrBr7 pentagonal bipyramids. The Pr(1)-Br(1) bond length is 2.99 Å. The Pr(1)-Br(3) bond length is 2.97 Å. The Pr(1)-Br(4) bond length is 2.96 Å. There are two shorter (2.99 Å) and two longer (3.05 Å) Pr(1)-Br(2) bond lengths. There are four inequivalent Br sites. In the first Br site, Br(1) is bonded to four equivalent K(1) and one Pr(1) atom to form BrK4Pr trigonal bipyramids that share corners with four equivalent Br(3)K4Pr trigonal bipyramids, corners with five equivalent Br(4)K4Pr trigonal bipyramids, corners with eight equivalent Br(2)K2Pr2 trigonal pyramids,  an edgeedge with one Br(3)K4Pr trigonal bipyramid, edges with two equivalent Br(1)K4Pr trigonal bipyramids, edges with two equivalent Br(4)K4Pr trigonal bipyramids, edges with two equivalent Br(2)K2Pr2 trigonal pyramids, and  a faceface with one Br(3)K4Pr trigonal bipyramid. In the second Br site, Br(2) is bonded to two equivalent K(1) and two equivalent Pr(1) atoms to form distorted BrK2Pr2 trigonal pyramids that share corners with two equivalent Br(3)K4Pr trigonal bipyramids, corners with two equivalent Br(4)K4Pr trigonal bipyramids, corners with four equivalent Br(1)K4Pr trigonal bipyramids, corners with six equivalent Br(2)K2Pr2 trigonal pyramids,  an edgeedge with one Br(1)K4Pr trigonal bipyramid, edges with two equivalent Br(3)K4Pr trigonal bipyramids, edges with two equivalent Br(4)K4Pr trigonal bipyramids, and  an edgeedge with one Br(2)K2Pr2 trigonal pyramid. In the third Br site, Br(3) is bonded to four equivalent K(1) and one Pr(1) atom to form BrK4Pr trigonal bipyramids that share  a cornercorner with one Br(4)K4Pr trigonal bipyramid, corners with four equivalent Br(1)K4Pr trigonal bipyramids, corners with four equivalent Br(3)K4Pr trigonal bipyramids, corners with four equivalent Br(2)K2Pr2 trigonal pyramids,  an edgeedge with one Br(1)K4Pr trigonal bipyramid, edges with four equivalent Br(4)K4Pr trigonal bipyramids, edges with four equivalent Br(2)K2Pr2 trigonal pyramids, and  a faceface with one Br(1)K4Pr trigonal bipyramid. In the fourth Br site, Br(4) is bonded to four equivalent K(1) and one Pr(1) atom to form distorted BrK4Pr trigonal bipyramids that share  a cornercorner with one Br(3)K4Pr trigonal bipyramid, corners with four equivalent Br(4)K4Pr trigonal bipyramids, corners with five equivalent Br(1)K4Pr trigonal bipyramids, corners with four equivalent Br(2)K2Pr2 trigonal pyramids, edges with two equivalent Br(1)K4Pr trigonal bipyramids, edges with four equivalent Br(3)K4Pr trigonal bipyramids, and edges with four equivalent Br(2)K2Pr2 trigonal pyramids.