“Clathrates” (?) of noble-gas fluorides

Abstract

Reactions between gold pentafluoride and alkali-earth metals fluorides in non-aqueous hydrogen fluoride were investigated. Ca(AuF 6) 2, Sr(AuF 6) 2 and Ba(AuF 6) 2 were identified. The Raman spectra of the received compounds were examined in crystalline form and in the non-aqueous HF solution. It was found out, that bis-hexafluoroaurates had high solubility in non-aqueous HF. The Raman spectra of liquid system HFM II(AuF 6)KrF 2 were investigated. The compounds of variable composition on KrF 2, where n=1+4 (Ba, Sr) and n=1+3 (Ca) were crystallized from this system, if the solvent were evaporated slowly. ▪ The results of Raman spectra analyses of obtained compounds are presented. Interaction between KrF 2 and M II(AuF 6) 2 leads to essential increase of vibrational frequency of KrF bond (up to 35 cm −1) comparing with KrF 2 (462 cm −1) and to the splitting of vibrational bond. This interaction decreases with increase of n; the possible nature of interaction is discussed. The received compounds are characterized by higher thermal stability of the “bonded” KrF 2. If heated up to 350 K KrF 2 may be quantatively obtained from the salts. If heated quickly up to 370+380 K the salts decomposes with explosion. The energy aspect of the complex salts formation is discussed. The results of interaction between M II(AuF 6) 2 and xenon fluorides will be also presented.