This catalyst, also known as Bis(1,5-cyclooctadiene)di-μ-methoxydiiridium(I), presents as a red crystalline solid. It is soluble in chlorinated solvents, slightly soluble in methanol, acetone, and diethyl ether, and insoluble in water. This substance is stable under recommended storage conditions. (1,5-Cyclooctadiene)(methoxy)iridium(I) Dimer is incompatible with strong oxidizing agents. This chemical also causes skin irritation, serious eye irritation, and may also cause respiratory irritation.