Untersuchung von Goldfluoriden und ihren Edelgaskomplexen durch Matrixisolationsspektroskopie und quantenchemische Rechnungen

Abstract

Edelgase mit feinen Unterschieden: Matrixisolationsexperimente haben in Kombination mit quantenchemischen Rechnungen zur Identifizierung von zwei neuartigen Verbindungen geführt: des ersten offenschaligen binären Goldfluorids AuF2 sowie eines NeAuF‐Komplexes. Darüber hinaus wurden ArAuF, AuF3, Au2F6 und monomeres AuF5 bei 4 K in Edelgasmatrizen isoliert und charakterisiert.

Investigation of Molecular Alkali Tetrafluorido Aurates by Matrix‐Isolation Spectroscopy

“…Two metal‐independent bands at 694 and 692 cm −1 are, according to Wang et al., assigned to AuF 3 . Two further weak bands at 655 and 494 cm −1 in this previous work were attributed to Au 2 F 6 obtained by evaporation of solid AuF 3 in a Knudsen cell . In our spectra, the 655 cm −1 band is not present.…”

“…The position of some of those bands were found to be alkali metal‐dependent and some are metal‐independent. Two metal‐independent bands at 694 and 692 cm −1 are, according to Wang et al., assigned to AuF 3 . Two further weak bands at 655 and 494 cm −1 in this previous work were attributed to Au 2 F 6 obtained by evaporation of solid AuF 3 in a Knudsen cell .…”

“…[8,9] Twof urtherw eakb ands at 655 and 494 cm À1 in this previous work were attributed to Au 2 F 6 obtained by evaporation of solid AuF 3 in aK nudsen cell. [8,9] In our spectra, the 655 cm À1 band is not present.I nstead we observed four strong bands at 665, 660, 494, and 492 cm À1 associated with the four strongest stretching bands of Au 2 F 6 (D 2h ): the in-phasea ntisymmetric( b 2u )a nd the out-ofphase symmetric (b 3u )s tretching modes of the terminal F atoms, and the in-phase antisymmetric (b 3u )a nd the out-ofphase symmetric (b 2u )s tretching modes of the bridging F atomsi nd escending order.Ac omparison of the calculated Au 2 F 6 vibrational spectrum with our experimental resultsi s showni nT able S1 in the Supporting Information. Both sets of bands, due to AuF 3 andA u 2 F 6 diminish under UV light (l = 273 nm), whereby the AuF 3 bands are more sensitive to irradiation.…”