Binuclear Binuclear complexes of rhodium or copper with pentamethylcyclopentadienyltricarbonyltungsten. Crystal structure of (η5-C5Me5)(CO)W(μ-CO)2Rh(PPh3)2

W. Edward Lindsell, Kevin J. McCullough, Sabine Plancq

Research output: Contribution to journalArticle

Abstract

The reaction of Li[W(CO)3Cp{black star}] (Cpp{black star} = ?5-C5Me5) with [RhCl(PPh3)3] affords [Cp{black star}(CO)W(µ-CO)2Rh(PPh3)2],3, which has been structurally characterised by an X-ray diffraction study, and shown to contain a short WRh bond of 2.5820(6) Å and two semi-bridging CO ligands. Variable temperature 31P{1H} NMR spectra show that complex 3 is fluxional in solution and undergoes intramolecular interchange of inequivalent PPh3 with ?G‡ca. 30 kJ mol-1 at -105°C. Reaction of Li[W(CO)3Cp{black star}] with [RhCl(PPh3)3] gives the mono-triphenylphosphine complex [Cp{black star}W(CO)3Cu(PPh3)], 4a, which has the same valence electron count as 3 and has been characterised analytically and by IR and NMR spectroscopy. Evidence for a related molybdenum-copper species, 4b, is also presented. The structural and spectroscopic properties of new products are discussed in relation to those of related heterobinuclear compounds. © 1995.

Original languageEnglish
Pages (from-to)275-281
Number of pages7
JournalJournal of Organometallic Chemistry
Volume491
Issue number1-2
Publication statusPublished - 5 Apr 1995

Keywords

  • Carbonyl
  • Copper
  • Fluxionality
  • Pentamethylcyclopentadienyl
  • Rhodium
  • Tungsten

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