Iodure de (cyclopentadiényl)fer dicarbonyle

Iodure de (cyclopentadiényl)fer dicarbonyle
Image illustrative de l’article Iodure de (cyclopentadiényl)fer dicarbonyle
Structure de l'iodure de (cyclopentadiényl)fer dicarbonyle
Identification
Synonymes

FpI

No CAS 12078-28-3
No ECHA 100.155.006
No CE 626-622-8
PubChem 138114916
SMILES
InChI
Propriétés chimiques
Formule C7H5FeIO2
Masse molaire[1] 303,863 ± 0,009 g/mol
C 27,67 %, H 1,66 %, Fe 18,38 %, I 41,76 %, O 10,53 %,
Propriétés physiques
fusion 119 °C[2]
Précautions
SGH[2]
SGH07 : Toxique, irritant, sensibilisant, narcotique
Attention
H302+H312+H332, P261, P264, P280, P301+P312, P302+P352+P312 et P304+P340+P312

Unités du SI et CNTP, sauf indication contraire.

L'iodure de (cyclopentadiényl)fer dicarbonyle est un complexe organofer de formule chimique (η5-C5H5)Fe(CO)2I. Parfois désigné sous l'abréviation FpI, il s'agit d'un solide brun foncé, soluble dans les solvants organiques usuels, dont la molécule adopte une géométrie en tabouret de piano. C'est un intermédiaire dans la préparation d'autres organofers ainsi que de ferraboranes. Signalé pour la première fois en 1956[3], il est synthétisé par réaction du diiode I2 avec le dimère de (cyclopentadiényl)fer dicarbonyle [(η5-C5H5)Fe(CO)2]2[4] :

[(η5-C5H5)Fe(CO)2]2 + I2 ⟶ 2 (η5-C5H5)Fe(CO)2I.

La molécule a une symétrie Cs avec un plan de symétrie coupant l'iodure, le fer et un atome de carbone du cycle cyclopentadiényle. La cristallographie aux rayons X donne les longueurs de liaison suivantes : 172 pm du fer au centroïde du cycle cyclopentadiényle, 261 pm du fer à l'iode, et 178 pm du fer au carbonyle[5].

Notes et références

  1. Masse molaire calculée d’après « Atomic weights of the elements 2007 », sur www.chem.qmul.ac.uk.
  2. a et b Fiche Sigma-Aldrich du composé Dicarbonylcyclopentadienyliodoiron(II), consultée le 26 mai 2022.
  3. (en) B. F. Hallam et P. L. Pauson, « 588. Ferrocene derivatives. Part III. Cyclopentadienyliron carbonyls », Journal of the Chemical Society (Resumed),‎ , p. 3030-3037 (DOI 10.1039/jr9560003030, lire en ligne)
  4. (en) R. B. King, F. G. A. Stone, William L. Jolly, Gordon Austin, William Covey, David Rabinovich, Henry Steinberg et Roy Tsugawa, « Cyclopentadienyl Metal Carbonyls and Some Derivatives », Inorganic Syntheses, vol. 7,‎ (DOI 10.1002/9780470132388.ch31, lire en ligne)
  5. (en) M. Zeller, E. Lazich et A. D. Hunter, « Dicarbonyl(η5-cyclopentadienyl)iodoiron(II) », Acta Crystallographica Section E, vol. 59,‎ , p. 914-915 (DOI 10.1107/S1600536803019950, lire en ligne)

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