Chlorobis(cyclooctene)iridium dimer is an organoiridium compound with the formula Ir₂Cl₂(C₈H₁₄)₄, where C₈H₁₄ is ''cis''-

cyclooctene Cyclooctene is the cycloalkene with a formula . Its molecule has a ring of 8 carbon atoms, connected by seven single bonds and one double bond. Cyclooctene is notable because it is the smallest cycloalkene that can exist stably as either the '' ...

. 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

ligand In coordination chemistry, a ligand is an ion or molecule with a functional group that binds to a central metal atom to form a coordination complex. The bonding with the metal generally involves formal donation of one or more of the ligand's el ...

s, more so than the diene ligands in the related complex cyclooctadiene iridium chloride dimer. For example, with triphenylphosphine (PPh₃), it reacts to give IrCl(PPh₃)₃: :Ir₂Cl₂(C₈H₁₄)₄ + 6 PPh₃ → 2 IrCl(PPh₃)₃ + 4 C₈H₁₄

References

{{Iridium compounds Organoiridium compounds Homogeneous catalysis Alkene complexes Dimers (chemistry) Chloro complexes Eight-membered rings