Abstract
Superacids are more acidic than pure sulphuric acid whose acidity is closely associated with the electronic stability of their conjugate-base anions. We have noticed that these anions possess extremely large vertical detachment energies, exceeding to the electron affinity of Cl, and therefore, they belong to a special class namely, superhalogen. Consequently, the superacids can be thought of as hydrogenated superhalogens. To demonstrate this idea, we have studied the hydrogen complexes of typical superhalogens LiF2, LiCl2, BeF3, BeCl3, BF4 and PF6. The order of their gas phase acidities, HBeCl3>HPF6>HLiCl2>HBeF3>HBF4>H2SO4>HLiF2>HCl clearly suggest superhalogens as building blocks of superacids. Various other parameters of hydrogenated superhalogens are also described which are closely associated with their chemical reactivity. This work should provide a suitable path to design new superacids which might be more acidic than HSbF6, the strongest known superacid till date.
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