Molybdenum tetrachloride

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Molybdenum tetrachloride
Identifiers
CAS number 13320-71-3 YesY
PubChem 83340
Properties
Molecular formula Cl4Mo
Molar mass 237.752 g/mol
Appearance black solid
Melting point 552°C
Solubility in water Decomposes
Hazards
NFPA 704
Flammability code 0: Will not burn. E.g., water Health code 3: Short exposure could cause serious temporary or residual injury. E.g., chlorine gas Reactivity code 1: Normally stable, but can become unstable at elevated temperatures and pressures. E.g., calcium Special hazards (white): no codeNFPA 704 four-colored diamond
Flash point Non flammable
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
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Infobox references

Molybdenum tetrachloride is the inorganic compound with the empirical formula MoCl4. The material exists as two polymorphs, a polymeric ("α") and a hexameric ("β") structures, although neither form is soluble in any solvent without degradation. In each polymorph, the Mo center is octahedral with two terminal chloride ligands and four doubly bridging ligands.[1]

It can be prepared from by dechlorination of molybdenum pentachloride using tetrachloroethene:[2]

2 MoCl5 + C2Cl4 → 2 MoCl4 + C2Cl6

The acetonitrile adduct, which is a versatile intermediate, can be prepared directly from the pentachloride:[3]

2 MoCl5 + 5 CH3CN → 2 MoCl4(CH3CN)2 + ClCH2CN + HCl

The MeCN ligands can be exchanged with other ligands:

MoCl4(CH3CN)2 + 2 THF → MoCl4(THF)2 + 2 CH3CN

References[edit]

  1. ^ Ulrich Müller "Hexameric Molybdenum Tetrachloride" Angewandte Chemie International Edition in English 1981, Volume 20, Pages 692 - 693. doi: 10.1002/anie.198106921
  2. ^ E. L. Mccann III, T. M. Brown "Molybpenum(IV) Chloride" Inorganic Syntheses 1970, volume 12, pages 181-186. doi:10.1002/9780470132432.ch31
  3. ^ Jonathan R. Dilworth, Raymond L. Richards "The Synthesis of Molybdenum and Tungsten Dinitrogen Complexes" Inorganic Syntheses 1990, volume 28, pages 33-43. doi: 10.1002/9780470132593