K3Mo2O7Br crystallizes in the hexagonal P6_3/mmc space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 10-coordinate geometry to nine equivalent O(1) and one Br(1) atom. In the second K site, K(2) is bonded in a 9-coordinate geometry to six equivalent O(1) and three equivalent Br(1) atoms. Mo(1) is bonded to one O(2) and three equivalent O(1) atoms to form corner-sharing MoO4 tetrahedra. There are two inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one K(2), three equivalent K(1), and one Mo(1) atom. In the second O site, O(2) is bonded in a linear geometry to two equivalent Mo(1) atoms. Br(1) is bonded to two equivalent K(1) and three equivalent K(2) atoms to form corner-sharing BrK5 trigonal bipyramids.
K3Mo2O7Br crystallizes in the hexagonal P6_3/mmc space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 10-coordinate geometry to nine equivalent O(1) and one Br(1) atom. There are three shorter (2.85 Å) and six longer (3.18 Å) K(1)-O(1) bond lengths. The K(1)-Br(1) bond length is 3.32 Å. In the second K site, K(2) is bonded in a 9-coordinate geometry to six equivalent O(1) and three equivalent Br(1) atoms. All K(2)-O(1) bond lengths are 3.15 Å. All K(2)-Br(1) bond lengths are 3.55 Å. Mo(1) is bonded to one O(2) and three equivalent O(1) atoms to form corner-sharing MoO4 tetrahedra. The Mo(1)-O(2) bond length is 1.91 Å. All Mo(1)-O(1) bond lengths are 1.77 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one K(2), three equivalent K(1), and one Mo(1) atom. In the second O site, O(2) is bonded in a linear geometry to two equivalent Mo(1) atoms. Br(1) is bonded to two equivalent K(1) and three equivalent K(2) atoms to form corner-sharing BrK5 trigonal bipyramids.