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The anhydrous salt K 2 B 12 F 12 crystallized from aqueous solution and its structure was determined by single crystal X-ray diffraction. The Ni 2 In-type structure it exhibits is rare for an A 2 X ionic compound at 25°C and 1atm., consisting of an expanded hexagonal close-packed array of B 12 F 122− centroids (cent⋯cent distances: 7.204–8...
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