Molybdenum Di-iodide, MoI₂

Molybdenum Di-iodide, MoI₂, has been prepared by heating the pentachloride to redness in hydrogen iodide as a brown amorphous powder, oxidised on heating and decomposed by boiling water.

The red solutions obtained by dissolving molybdenum sesquioxide or dioxide in aqueous hydrogen iodide were examined by Berzelius, but insufficiently to obtain definite conclusions.

The existence of the compound MoI₄ has been suggested by Guichard, who obtained black crystals on heating together under pressure hydrogen iodide and molybdenum pentachloride.

The chloroiodides Mo₃Cl₄I₂.3H₂O and Mo₃Cl₄I₂.6H₂O, and the hydroxybromoiodide Mo₃Br₄I(OH).4H₂O, have been described.