Hydrated and anhydrous salts of the icosahedral superweak anion dodecafluoro-closo-dodecaborate(2−), B12F122− (Z2−) with H3O+, NH4+, NHxRy+ (x + y = 4), and other acidic cations, have been prepared and studied by spectroscopic methods, thermogravimetry, and single-crystal X-ray crystallography. The presence of multiple crystalline hydrated phases, such as (H3O)2(H2O)6Z and (H3O)2(H2O)4Z as well as (NH4)2(H2O)4Z and (NH4)2(H2O)2Z, their extensively hydrogen-bonded structures, and their capacities for reversible hydration/dehydration will be presented. The use of the anhydrous acid salts to prepare metal salts of Z2− in weakly-coordinating solvents will also be presented. These acidic salts could serve as synthetic precursors for simple, efficient syntheses of other B12F122− salts or generation of new highly acidic species.

Acid cation salts of the superweak anion B12F122−

249th National Meeting (2015)

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