Organoiridium compound
Organoiridium compounds contain iridium-carbon chemical bonds. As a third row transition metal, iridium forms very stable bonds to carbon and the organometallic chemistry is extensive.
As for rhodium, the simplest iridium carbonyl, Ir2(CO)8 is not well characterized but tetrairidium dodecacarbonyl, Ir
4(CO)
12, the most common binary carbonyl of iridium, is well known. In this compound each iridium centre is bonded to the three others, forming a tetrahedral cluster. Unlike Co4(CO)12, this Ir4 cluster exclusively features terminal carbonyl ligands. Some organometallic Ir(I) compounds are notable enough to be named after their discoverers. One is Vaska's complex, IrCl(CO)[P(C
6H
5)
3]
2, which has the unusual property of reversibly binding dioxygen molecule, O2. The anionic carbonyl [IrI2(CO)2]2− is an intermediate in the Cativa Process discussed below.
Diene complexes of iridium are extensively developed, mainly starting from Ir2Cl2(cyclooctadiene)2. One noteworthy derivative is Crabtree's catalyst, a homogeneous catalyst for hydrogenation reactions. Iridium(I) complexes are often square planar with a total of 16 valence electrons, which accounts for their reactivity.
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