Molybdenum tetrachloride
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| Molybdenum tetrachloride | ||
|---|---|---|
| IUPAC name Molybdenum tetrachloride | ||
| Other names Molybdenum(IV) chloride | ||
| Identifiers | ||
| CAS number | 13320-71-3  | |
| 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 |
 0
3
1
| |
| Flash point | Non flammable | |
(verify) (what is: / ?)Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa) | ||
| 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
- ↑ Ulrich Müller "Hexameric Molybdenum Tetrachloride" Angewandte Chemie International Edition in English 1981, Volume 20, Pages 692 - 693. doi: 10.1002/anie.198106921
- ↑ E. L. Mccann III, T. M. Brown "Molybpenum(IV) Chloride" Inorganic Syntheses 1970, volume 12, pages 181-186. doi:10.1002/9780470132432.ch31
- ↑ 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
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