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Structures for hypervalent anions KF3- and KF2- have been optimized at MP4SD(T)(full) and CCSD(T) with both 6-311+G(d) and 6-311+G(3df) basis sets. Anion KF3- is T-shaped and KF2- is linear. The calculated vertical electron detachment energy (VDE) for KF3- (6.83eV) is higher than that of the classical superhalogen anion KF2- (5.52eV). The lowest dissociation pathways are for KF3-, ΔH0°=23.3kcalmol...
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