Abstract
We propose a new series of superacids by protonation of hexa-halide anions MX6−(M = Ni, Pd, Pt & X = F, Cl) by using combination of DFT/B3LYP method and SDD basis set. The strength of superacid is calculated by their Gibbs free energies of deprotonation. The acidity of these superacids is not only related to electronic stability of corresponding metallic anions MX6− but also on topology of protonated metallic anions. We have noticed that these base anions have very high vertical detachment energy (VDE), which indicates that they belong to superhalogenic family. A rough correlation (R2 = 0.62) is found in between VDE of MX6−and acidity of protonatedMX6−. The AIM analyses of HMX6 help to understand its superacidic behaviour. Some electronic parameters of HMX6 are also calculated by using same level theory. We have also discussed the optimized structure of NiF6Li supersalt. The HOMO LUMO plots are used to describe chemical reactivity as well as the binding nature of HMX6 superacids and LiNiF6 salt.
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