Thermochemistry of fluorine compounds. Part I. The difluoroiodate series

Abstract

From measurements of the heats of aqueous alkaline hydrolysis at 25 °C the standard enthalpies of formation of the following fluoroiodates are derived: ΔH_f°[NalO₂F₂,cryst.]₂₉₈= 202·8₅± 0·3 kcal mol^–1(–848·7 ± 1·2 kJ mol^–1); ΔH_f°[KlO₂F₂,cryst.]₂₉₈=–209·5 ± 0·3 kcal mol^–1(–876·6 ± 1·2 kJ mol^–1); ΔH_f°[RblO₂F₂,cryst.]₂₉₈=–209·2 ± 0·3 kcal mol^–1(–875·3 ± 1·2 kJ mol^–1) and ΔH_f°[NH₄IO₂F₂,cryst.]₂₉₈=–178·7 ± 0·3 kcal mol^–1(–754·6 ± 1·2 kJ mol^–1). Estimates of lattice energies and other thermodynamic parameters are also reported.