Chlorobis(cyclooctene)iridium dimer

Chlorobis(cyclooctene)iridium dimer is an organoiridium compound with the formula Ir₂Cl₂(C₈H₁₄)₄, where C₈H₁₄ is cis-cyclooctene. Sometimes abbreviated Ir₂Cl₂(coe)₄, it is a yellow, air-sensitive solid that is used as a precursor to many other organoiridium compounds and catalysts.

The compound is prepared by heating an alcohol solution of sodium hexachloroiridate with cyclooctene in ethanol. The coe ligands are easily displaced by other more basic ligands, more so than the diene ligands in the related complex cyclooctadiene iridium chloride dimer.