Iodure de baryum

Iodure de baryum
Image illustrative de l’article Iodure de baryum
Identification
Nom UICPA Iodure de baryum
No CAS 13718-50-8 (anhydre)
7787-33-9 (dihydraté)
No ECHA 100.033.873
PubChem 83684
Apparence Solide blanc (BaI2 anhydre), cristaux incolores (BaI2·2H2O)
Propriétés chimiques
Formule BaI2  [Isomères]BaI2·2H2O
Masse molaire[1] 391,136 ± 0,007 g/mol
Ba 35,11 %, I 64,89 %,
Susceptibilité magnétique 124,0·10-6 cm3mol
Propriétés physiques
fusion 711 °C (anhydre)

740 °C (composé dihydraté)

Solubilité 1667 g/L (eau, °C)
2210 g/L (eau, 20 °C)
2466 g/L (eau, 70 °C)
Soluble dans l'éthanol et l'acétone.
Masse volumique 5,15 g/cm3 (anhydre)

4,916 g/cm3 (dihydraté)

Thermochimie
ΔfH0liquide −602,1 kJ/mol-1
Cristallographie
Système cristallin Orthorhombique
Symbole de Pearson oP12
Classe cristalline ou groupe d’espace n°62
Hermann-Pauguin court : Pnma
Composés apparentés
Autres cations Iodure de béryllium
Iodure de magnésium
Iodure de calcium
Iodure de strontium
Autres anions Fluorure de baryum
Chlorure de baryum
Bromure de baryum

Unités du SI et CNTP, sauf indication contraire.

L'iodure de baryum est un composé inorganique de formule brute BaI2 . Le composé existe sous la forme d'un anhydre et d'un hydrate (BaI2(H2O)2), qui sont tous deux des solides blancs. Lorsqu'il est chauffé, l'iodure de baryum dihydraté se transforme en sel anhydre. La forme hydratée est soluble dans l'eau, l'éthanol et l'acétone .

Structure

La structure de la forme anhydre ressemble à celle du chlorure de plomb(II) avec chaque centre Ba lié à neuf ligands iodure[2] et possède une structure cristalline assez similaire à BaCl2[3]

Réactions

L'iodure de baryum anhydre peut être préparé en traitant le métal Ba avec du 1,2-diiodoéthane dans de l'éther[4] .

L'iodure de baryum réagit avec les composés alkylpotassium pour former des composés organobaryum[5].

L'iodure de baryum peut être réduit avec du biphénylide de lithium, pour donner une forme hautement active de baryum métallique[6].

Sécurité

Comme tous les sels de baryum, l'iodure de baryum est un composé toxique.

Notes et références

  1. Masse molaire calculée d’après « Atomic weights of the elements 2007 », sur www.chem.qmul.ac.uk.
  2. Wells, A.F. (1984) Structural Inorganic Chemistry, Oxford: Clarendon Press. (ISBN 0-19-855370-6)
  3. Brackett, E. B.; Brackett, T. E.; Sass, R. L.; The Crystal Structures of Barium Chloride, Barium Bromide, and Barium Iodide.
  4. Duval, E.; Zoltobroda, G.; Langlois, Y.; A new preparation of BaI2: application to (Z)-enol ether synthesis.
  5. Walter, M. D.; Wolmershauser, G.; Sitzmann, H.; Calcium, Strontium, Barium, and Ytterbium Complexes with Cyclooctatetraenyl or Cyclononatetraenyl Ligands.
  6. Yanagisawa, A.; Habaue, S.; Yasue, K.; Yamamoto, H.; Allylbarium Reagents: Unprecedented Regio- and Stereoselective Allylation Reactions of Carbonyl Compounds.

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