Photochemistry with Chlorine Trifluoride : Syntheses and Characterization of Difluorooxychloronium(V) Hexafluorido(non)metallates(V), [ClOF2][MF6] (M=V, Nb, Ta, Ru, Os, Ir, P, Sb)

Benjamin Scheibe, Antti J. Karttunen, Florian Weigend, Florian Kraus*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

Abstract

A photochemical route to salts consisting of difluorooxychloronium(V) cations, [ClOF2]+, and hexafluorido(non)metallate(V) anions, [MF6] (M=V, Nb, Ta, Ru, Os, Ir, P, Sb) is presented. As starting materials, either metals, oxygen and ClF3 or oxides and ClF3 are used. The prepared compounds were characterized by single-crystal X-ray diffraction and Raman spectroscopy. The crystal structures of [ClOF2][MF6] (M=V, Ru, Os, Ir, P, Sb) are layer structures that are isotypic with the previously reported compound [ClOF2][AsF6], whereas for M=Nb and Ta, similar crystal structures with a different stacking variant of the layers are observed. Additionally, partial or full O/F disorder within the [ClOF2]+ cations of the Nb and Ta compounds occurs. In all compounds reported here, a trigonal pyramidal [ClOF2]+ cation with three additional Cl⋅⋅⋅F contacts to neighboring [MF6] anions is observed, resulting in a pseudo-octahedral coordination sphere around the Cl atom. The Cl−F and Cl−O bond lengths of the [ClOF2]+ cations seem to correlate with the effective ionic radii of the MV ions. Quantum-chemical, solid-state calculations well reproduce the experimental Raman spectra and show, as do quantum-chemical gas phase calculations, that the secondary Cl⋅⋅⋅F interactions are ionic in nature. However, both solid-state and gas-phase quantum-chemical calculations fail to reproduce the increases in the Cl−O bond lengths with increasing effective ionic radius of M in [MF6] and the Cl−O Raman shifts also do not generally follow this trend.

Original languageEnglish
Pages (from-to)2381-2392
Number of pages12
JournalChemistry - A European Journal
Volume27
Issue number7
Early online date22 Dec 2020
DOIs
Publication statusPublished - 1 Feb 2021
MoE publication typeA1 Journal article-refereed

Keywords

  • chlorine trifluoride
  • difluorooxychloronium(V) cation
  • fluorine
  • photochemistry
  • single-crystal X-ray diffraction

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