were prepared from stoichiometric mixtures of Hg 2 X 2 , HgX 2 (X β«Ψβ¬ Cl, Br), As, Sb, and Bi in sealed, evacuated glass ampoules in temperature gradients 260P2403C for Hg 6 Sb 5 Br 7 , 340P3203C for Hg 6 As 4 BiCl 7 , and 290P2703C for Hg 6 Sb 4 BiBr 7 . All compounds crystallize in the cubic space group Pa3 with Z β«Ψβ¬ 4 and the lattice constants a β«Ψβ¬ 13.003(1) A > for Hg 6 Sb 5 Br 7 , a β«Ψβ¬ 12.178(2) A > for Hg 6 As 4 BiCl 7 , and a β«Ψβ¬ 12.998(4) A > for Hg 6 Sb 4 BiBr 7 . The structures have been solved based on singlecrystal X-ray di4raction data and re5ned to R(F) β«Ψβ¬ 0.0431, 666 F o for Hg 6 Sb 5 Br 7 , R(F) β«Ψβ¬ 0.0478, 690 F o for Hg 6 As 4 BiCl 7 , and R(F) β«Ψβ¬ 0.0444, 840 F o for Hg 6 Sb 4 BiBr 7 with 30 parameters for each re5nement. The structures are characterized by a threedimensional polycationic framework of pnictide dumb-bells (As}As distance 2.43 A > , Sb}Sb distance 2.78 A > ), each connected by six mercury atoms to six neighbored As 2 /Sb 2 groups. There are two di4erent cages in the framework; one type is occupied by nearly regular MX 6 octahedra (M β«Ψβ¬ Sb,Bi; X β«Ψβ¬ Cl, Br), the other by halide ions. The three compounds crystallize closely related to Cd 7 P 4 Cl 6 , which contains a similar polycationic framework of P 2 dumb-bells connected by Cd, but with only one type of cage occupied by octahedral [CdCl 6 ] 4Ψ ions. The interactions between the atoms of the polycationic framework and the anions are very weak. The observed diamagnetism of all three compounds is in agreement with the ionic formulas (Hg