Abstract
The crystal energies of the thallium(I) halides, particularly TlF, have been recalculated. The results, in kcal mol–1, are TlF: –196 (–200) TlCl: –169 (–178) TlBr: –163 (–174) TlI: –157 (–168); the values in parentheses have been derived from a Born-Haber cycle. The enthalpy of hydration of the Tl+ ion is –97 kcal mol–1, and the mean molal ionic activity coefficient of TlF in saturated solution is 0.687. The interatomic bonding in the thallium(I) halides is compared with that in the silver halides.
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