The fluorobasicities of ReF7 and IF7 as measured by the enthalpy change ΔH°(EF7(g) → EF6+(g) + F−(g))

Abstract

Iridium hexafluoride oxidizes ReF6 (via an ReF6+ salt) and at room temperatures IrF6, ReF6, ReF7 and (IrF5)4 are each present in the equilibrium mixture. From these and related findings: ΔH°(ReF6 → ReF6+ + e−) 1092 ± 27 kj mole−1(261 ± 6 kcal mole−1), and thermodynamic data are selected to yield ΔH°(ReF7(g) → ReF6+(g) + F−(g))=893 ± 33 kj mole−1(213 ± 8 kcal mole−1). From observations on the stability of IF6+BF4− and the lattice enthalpy evaluation for the salt, ΔH°(IF7(g) → IF6+(g) + F−(g))= 870 ± 24 kj mole−1(208 ± 6 kcal mole−1).