Molybdenum dichloride dioxide is the inorganic compound with the formula . 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.
Gaseous molybdenum dichloride dioxide is a monomer, but upon condensation, it polymerizes to give a coordination polymer of uncertain structure.
MoO<sub>2</sub>Cl<sub>2</sub> can also be prepared from MoOCl<sub>4</sub>:
It is also prepared by chlorination of molybdenum dioxide and molybdenum trioxide:
Many bisadducts are known of the type . 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:
When treated with bulky anilines, converts to diimido complexes, one of which is . This complex is the precursor to the Schrock carbenes of the type .