New PF3 and Carbonyl Chemistry of Tantalum

John E. Ellis, Garry F. Warnock, Mikhail V. Barybin, Marie K. Pomije

Research output: Contribution to journalArticlepeer-review

33 Scopus citations

Abstract

Reduction of [TaCl5] by six equivalents of alkali metal naphthalenide in 1,2‐dimethoxyethane at −60°C followed by treatment with gaseous PF3 provides the first homoleptic phosphane complex containing tantalum in the −1 oxidation state, [Ta(PF3)6]. This can be protonated by concentrated sulfuric acid to yield the previously unknown highly acidic and volatile hydride [HTa(PF3)6]. An improved normal‐pressure synthesis of [Ta(CO)6] is described. Reduction of the latter species by sodium in liquid ammonia gives the carbonyl trianion [Ta(CO)5]3− which undergoes monoprotonation and stannylation to form [HTa(CO)5]2− and [Ph3SnTa(CO)5]2−, respectively. The hydride is a useful precursor to [(Ph3PAu)3Ta(CO)5], the only known gold cluster of tantalum.

Original languageEnglish (US)
Pages (from-to)521-527
Number of pages7
JournalChemistry – A European Journal
Volume1
Issue number8
DOIs
StatePublished - Nov 1995

Keywords

  • carbonyl ligands
  • organometallic compounds
  • phosphorus ligands
  • tantalum compounds

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