Iridium electron configuration

The most common oxidation states, corresponding electronic configurations, and coordination geometries of iridium are +1 (t5 ) usually square plane although some five-coordinate complexes are known, and +3 (t7 ) and +4 (t5 ), both octahedral. Compounds ia every oxidation state between —1 and +6 (<5 ) are known. Iridium compounds are used primarily to model more active rhodium catalysts. 

The oxidative addition has been most extensively studied on iridium complexes, particularly Vaska s complex. The latter is a square planar complex, frans-L2lrCl(CO), with a d8 electron count containing iridium(I). After the oxidative addition we formally obtain iridium(III), an octahedral complex, with a d6 electron configuration i.e. the 16-electron square-planar complex is converted into an octahedral 18-electron complex. In Fig. 4.26 we have depicted the oxidative addition of methyl iodide to Vaska s complex (L = phosphine) [39]. A large... 

Only a few complexes containing iridium(II) are known, most of which are of a special type as they are either dimeric and diamagnetic or contain non-innocent ligands. More likely, many reported iridium(II) complexes are hydrides of iridium(III) or iridium(III) complexes containing a o Ir—C bond rather than a supposed n Ir—C bond. Furthermore, iridium(II) complexes, with a d1 electronic configuration, are expected to be paramagnetic. 

Iridium (II) is not a common oxidation state for the metal and the d electronic configuration leads to Paramagnetism in mononuclear complexes. A representative example is square planar (37). 

The electron rich clusters of the first series of the transition metals are generally more sensitive to oxidation than clusters of the second and third series. The most stable electron-rich clusters are those of groups 8,9, and 10. Clusters of rhodium and iridium are exceptionally stable. However, some clusters of the first series of the transition metals can be stable. This is particularly true for compounds with stable electron configurations containing n-l-2, or n- -3 skeletal electron pairs. For example,... 

Meitnerium, Mt, element 109, named after lisa Meitner, is a transition metal expected to have the same outer-electron configuration as iridium. By using this observation (and without looking at Figure 6.28), write the electron configuration of meitnerium. Use [Rn] to represent the first 86 electrons of the electron configuration. 

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