Production of MoO2Cl2

A method for producing MoO2Cl2 under inert conditions, comprising the steps of:

• charging a reaction vessel with MoO2;
• reacting the MoO2 with supplied Cl2 in the reaction vessel at a first temperature T1 to give gaseous MoO2Cl2;
• transferring the gaseous MoO2Cl2 into a receiving vessel;
• resublimating the gaseous MoO2Cl2 in the receiving vessel to give solid MoO2Cl2 at a second temperature T2 that is lower than T1, wherein the second temperature T2 in the receiving vessel decreases during the method for producing MoO2Cl2;
• and
• recovering solid MoO2Cl2 with a purity determined by ICP-OES/MS of 99.9996 wt. % or more,
• wherein the reaction vessel and the receiving vessel are excluded from pressure reduction operations.