ChemInform Abstract: Structure of Fluoroaurates(V) of Alkaline Earth Elements.

Abstract

032ChemInform Abstract The title compounds M(AuF6)2 (M: Mg, Ca, Sr, Ba) are prepared by reacting MF2, Au and KrF2 in anhydrous HF at 0-20 rc C. Their structures are elucidated by Raman spectroscopy and by powder XRD. The compounds Mg(AuF6)2 and Ca(AuF6)2 elong to the space group P4 with Z=1 and the compounds Sr(AuF6)2 and Ba(AuF6)2 crystallize in the space group P43m or P23 (no distinction can be made, so far) with Z=4. The structure of the four compounds consists of AuF6-octahedra and M2+ cations. Further eatures of the structures are discussed.

Recent achievements in the synthesis and characterization of metal hexafluorantimonates and hexafluoroaurates

“…An additional problem in clarifying Ba(II)/Au(V)/Fchemistry, is the discrepancy between the results of characterization (vibrational and X-ray powder diffraction analysis) obtained in this study and those previously claimed [10]. Mg, Ca, Sr and Ba hexafluoroaurates studied in this work have Raman spectra which differ from those of previously reported [10], not only in the positions of observed bands but also in their number.…”

“…Mg, Ca, Sr and Ba hexafluoroaurates studied in this work have Raman spectra which differ from those of previously reported [10], not only in the positions of observed bands but also in their number. The Raman spectra of Mg(AuF 6 ) 2 and Ca(AuF 6 ) 2 compounds, obtained in this study, show particularly noticeable differences.…”

“…The Raman spectra of Mg(AuF 6 ) 2 and Ca(AuF 6 ) 2 compounds, obtained in this study, show particularly noticeable differences. They have more bands than previously reported [10], indicating relatively strong cation-anion interactions. Sr(AuF 6 ) 2 and both types of Ba(AuF 6 ) 2 compounds show the presence of more regular AuF À 6 octahedra.…”

“…Previously reported syntheses and characterization of hexafluoroaurates of Mg, Ca, Sr and Ba [10] were reinvestigated. Corresponding MF 2 /2AuF 3 starting mixtures (M = alkali-earth metal) were exposed to KrF 2 or UV- …”

“…New solid hexafluoroaurates were characterized by vibrational spectroscopy and X-ray powder diffraction analysis. Previously reported syntheses and characterization of M(AuF 6 ) 2 (M = Mg, Ca, Sr, Ba) compounds [10] were reinvestigated.…”