Molybdenum dichloride dioxide
Molybdenum dichloride dioxide is the inorganic compound with the formula MoO2Cl2. It is a yellow solid that is used as a precursor to other molybdenum compounds. It is a nonmolecular solid but is often encountered as its adducts MoO2Cl2(ether)2, which are soluble in organic solvents. It is one of several oxychlorides of molybdenum.
| Identifiers | |
|---|---|
| ECHA InfoCard | 100.157.480 |
PubChem CID |
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| Properties | |
| Cl2MoO2 | |
| Molar mass | 198.85 g·mol−1 |
| Appearance | yellow or cream solid |
| Melting point | 298 °C (568 °F; 571 K) |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |
| Infobox references | |
Preparation
The compound is most easily prepared by treatment molybdenum trioxide with concentrated hydrochloric acid:[1]
- MoO3 + 2 HCl → MoO2Cl2 + H2O
MoO2Cl2 can also be prepared from MoOCl4:[2]
- MoOCl4 + O(Si(CH3)3)2 → MoO2Cl2 + 2 ClSi(CH3)3
It is also prepared by chlorination of molybdenum dioxide:[3]
- MoO2 + Cl2 → MoO2Cl2
Reactions
MoO2Cl2 forms a variety of adducts, e.g. MoO2Cl2(thf)2. With bulky anilines, it converts to the diimido complex MoCl2(NAr)2(dimethoxyethane). This complex is the precursor to the Schrock carbenes of the type Mo(OR)2(NAr)(CH-t-Bu).[3]
References
- Francisco J. Arnaiz (1997). "Dichlorodioxobis(Dimethylsulphoxide) Molybdenum(VI)". Inorganic Syntheses. 31: 246-7. doi:10.1002/9780470132623.ch39.CS1 maint: uses authors parameter (link)
- Gibson, V. C.; Kee, T. P.; Shaw, A. (1988). "New, improved synthesis of the group 6 oxyhalides, W(O)Cl4, W(O)2Cl2 and Mo(O)2Cl2". Polyhedron. 7 (7): 579–80. doi:10.1016/S0277-5387(00)86336-6.
- Schrock, R. R.; Murdzek, J. S.; Bazan, G. C.; Robbins, J.; DiMare, M.; O'Regan, M. (1990). "Synthesis of molybdenum imido alkylidene complexes and some Reactions Involving Acyclic Olefins". Journal of the American Chemical Society. 112: 3875–3886. doi:10.1021/ja00166a023.CS1 maint: uses authors parameter (link)