Dimère de (cyclopentadiényl)tungstène tricarbonyle

Dimère de (cyclopentadiényl) tungstène tricarbonyle
Image illustrative de l’article Dimère de (cyclopentadiényl)tungstène tricarbonyle
Structure du dimère de (cyclopentadiényl) tungstène tricarbonyle
Identification
No CAS 12566-66-4
No ECHA 100.149.757
No CE 620-851-7
PubChem 45051817
SMILES
InChI
Propriétés chimiques
Formule C16H10O6W2
Masse molaire[1] 665,93 ± 0,04 g/mol
C 28,86 %, H 1,51 %, O 14,42 %, W 55,21 %,

Unités du SI et CNTP, sauf indication contraire.

Le dimère de (cyclopentadiényl)tungstène tricarbonyle est un complexe organométallique de formule chimique [(η5-C5H5)W(CO)3]2. Il s'agit d'un solide rouge foncé dont la molécule adopte une géométrie en tabouret de piano. Il existe selon deux conformères, l'un gauche et l'autre anti. Les six ligands CO sont terminaux, sans ligand pontant, tandis que la liaison WW a une longueur de 322,2 pm[2].

On le prépare en faisant réagir de l'hexacarbonyle de tungstène W(CO)6 avec du cyclopentadiénure de sodium Na(C5H5) puis en oxydant le (η5-C5H5)W(CO)3Na obtenu[3].

Notes et références

  1. Masse molaire calculée d’après « Atomic weights of the elements 2007 », sur www.chem.qmul.ac.uk.
  2. (en) R. D. Adams, D. M. Collins et F. A. Cotton, « Molecular structures and barriers to internal rotation in bis (η5-cyclopentadienyl)hexacarbonylditungsten and its molybdenum analog », Inorganic Chemistry, vol. 13, no 5,‎ , p. 1086-1090 (DOI 10.1021/ic50135a015, lire en ligne)
  3. (en) A. R. Manning, Paul Hacket, Ralph Birdwhistell, Paul Soye, David C. Miller et Robert J. Angelici, « Hexacarbonylbis(η5-Cyclopentadienyl)Dichromium, Molybdenum, and Tungsten and their Analogs, M25-C5H4R)2 (CO)6 (M = Cr, Mo, and W; R = H, Me or PhCH2) », Inorganic Syntheses: Reagents for Transition Metal Complex and Organometallic Syntheses, vol. 28,‎ (DOI 10.1002/9780470132593.ch39, lire en ligne)

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