Rerefinement of the crystal structure of α-ThBr(4)

Single crystals of α-ThBr(4), thorium(IV) tetra­bromide, were obtained as a side product from the reaction of CuBr with β-ThBr(4) at 753 K. In the crystal structure, the Th atom (site symmetry [Image: see text] ..) is surrounded by eight Br atoms in the form of a tetra­gonal-disphenoidal coordination polyhedron. The connectivity of these polyhedra is (3) (∞)[ThBr(4/2)Br(4/2)]. In comparison with the previous crystal structure refinement [Mason et al. (1974 ▸). J. Less-Common Met. 35, 331–338], the current rerefinement resulted in much higher preciscion of the lattice parameters and the atomic coordinates. [Image: see text]