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The reaction of antimony and selenium in the bromine‐rich Lewis acidic ionic liquid [BMIm]Br·4.7AlBr3 (BMIm: 1‐butyl‐3‐methylimidazolium) in the presence of a small amount of NbCl5 at 160 °C yielded dark‐red crystals of [Sb7Se8Br2][AlX4]3. For X = Cl0.15(1)Br0.85(1), the compound is isostructural to [Sb7S8Br2][AlCl4]3 [P212121, a = 12.5132(5) Å, b = 17.7394(6) Å, c = 18.3013(6) Å]. For a higher chlorine...
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