The dimeric [V2O4F6]4- vanadium oxide-fluoride anion in Na2(M(H2O)2)(V 2O4F6) (M= Co2+, Ni2+, and Cu2+)

Martin D. Donakowski, Anastasiya I. Vinokur, Kenneth R. Poeppelmeier

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Abstract

Three new vanadium oxide-fluoride phases, Na2(M(H 2O)2)(V2O4F6) (M= Co 2+, Ni2+, and Cu2+), were prepared by hydrothermal techniques in hydrofluoric acid. The compounds contain the dioxo vanadium fluoride dimeric anion: [V2O4F6] 4-. The harder (Na+) and softer (M = Co2+, Ni2+, and Cu2+) cations coordinate to the harder fluoride and softer oxide anions, respectively. In contrast to monoxo vanadium fluorides, the dioxo vanadium fluoride exhibits an increased nucleophilicity of the oxide anions. This increased nucleophilicity allows the anion to bond covalently with late transition metals to form 2D layers that contain both an early transition metal (V5+) and a late transition metal (Co2+, Ni 2+, or Cu2+).

Original languageEnglish
Pages (from-to)1991-1995
Number of pages5
JournalZeitschrift fur Anorganische und Allgemeine Chemie
Volume638
Issue number12-13
DOIs
Publication statusPublished - Oct 1 2012

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Keywords

  • Crystal structures
  • Dioxo vanadium fluoride anion
  • Hydrothermal synthesis
  • Oxide-fluorides
  • Vanadates

ASJC Scopus subject areas

  • Inorganic Chemistry

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