Preparation and properties of Molybdenum(V) Chloride
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- Category: Molybdenum knowledge
- Published on 09 September 2013
- Written by 陈桂兰
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MoCl5 is prepared by chlorination of Mo metal but also chlorination of MoO3. Notice that MoCl6 is not a product of simple chlorination of the base metal. In contrast, the heavier analogues WCl6 is well known.
MoCl5 is a strong oxidant, as indicated by its lack of reaction with Cl2. It is reduced by MeCN to afford an orange complex, MoCl4(MeCN)2, that in turn reacts with THF to give MoCl4(THF)2, a versatile starting material from which other
molybdenum-containing molecules may be prepared.[5] MoCl5 is reduced by HBr to form MoBr4. The bromination reaction is conducted in ethylbromide at -50 C, forming MoBr5 as an intermediate. Upon warming to 20 C, Br2 is produced and the formal oxidation state of molybdenum changes from +5 to +4. The net transformation is shown in the equation:
2 MoCl5 + 10 HBr → 2 MoBr4 + 10 HCl + Br2
MoBr4 reacts with THF to give the Mo(III) species mer-MoBr3(THF)3.
MoCl5 is a good Lewis acid toward non-oxidizable ligands. It forms an adduct with chloride to form [MoCl6]-. In organic synthesis, the compound finds occasional use in chlorinations and deoxygenation reactions.
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