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Molybdenum dichloride dioxide

Chemical compound From Wikipedia, the free encyclopedia

Molybdenum dichloride dioxide is the inorganic compound with the formula MoO2Cl2. It is a yellow diamagnetic solid that is used as a precursor to other molybdenum compounds. Molybdenum dichloride dioxide is one of several oxychlorides of molybdenum.[1]

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Molybdenum dichloride dioxide
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.157.480 Edit this at Wikidata
EC Number
  • 629-286-0
  • InChI=1S/2ClH.Mo.2O/h2*1H;;;/q;;+2;;/p-2
    Key: JCFNAADCQWXIJD-UHFFFAOYSA-L
  • [Mo](Cl)(Cl)(=O)=O
Properties
MoO2Cl2
Molar mass 198.85 g·mol−1
Appearance yellow or cream solid
Melting point 175 °C (347 °F; 448 K)
Hazards
GHS labelling:
GHS05: Corrosive
Danger
H314
Related compounds
Related compounds
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Structure

Gaseous molybdenum dichloride dioxide is a monomer,[2] but upon condensation, it polymerizes to give a coordination polymer of uncertain structure.

Preparation

MoO2Cl2 can also be prepared from MoOCl4:[3]

MoOCl4 + O(Si(CH3)3)2 → MoO2Cl2 + 2 ClSi(CH3)3

It is also prepared by chlorination of molybdenum dioxide and molybdenum trioxide:[4][5]

MoO2 + Cl2 → MoO2Cl2
MoO3 + Cl2 → MoO2Cl2 [more detail needed]

Reactions

Many bisadducts are known of the type MoO2Cl2(ether)2. These octahedral molecular complexes are soluble in organic solvents. The adduct with dimethylsulfoxide can be readily prepared by treatment molybdenum trioxide with concentrated hydrochloric acid:[6]

MoO3 + 2 HCl + 2 L → MoO2Cl2L2 + H2O

When treated with bulky anilines, MoO2Cl2 converts to diimido complexes, one of which is MoCl2(=N−Ar)2(dimethoxyethane). This complex is the precursor to the Schrock carbenes of the type Mo(OR)2(=N−Ar)(=CH−tBu).[4]

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