Iridium complexes, homobimetallic

Polymetallic alkynes, with platinum heterobimetallic derivatives, 8, 647 homobimetallic complexes, 8, 645 polymetallic derivatives, 8, 648 Polymetallic cyclopentadienyl iridium complexes, preparation and characteristics, 7, 370... 

Homobimetallic iridium(I) complexes containing the binucleating PNNP ligand undergo oxidative addition and reductive elimination reactions with acetyl chloride and methyl iodide. Thus,... 

Hydrides are one of the most commonly found bridging ligands in iridium homobimetallic complexes. The symmetry or asymmetry of the hydride bridge is usually determined by the nature of the trans-ligands in both metal centers. For example, the complexes depicted in Fig. 1 feature asymmetric hydride bridges in solution and in the solid state. Although the position of the bridging hydrides obtained from X-ray diffraction must be examined with care due to the limited accuracy of the technique for these situations, this assumption has been also supported by NMR studies in solution [63, 64]. 

This section will focus on the reactivity and catalytic applications of homobimetallic iridiiun complexes containing the two metal centers in close proximity, purposely excluding examples of heterobimetallic systems that contain an iridium center, since their rich chemistry makes it impossible to deliver a comprehensive description within the scope of this chapter. However, for the interested reader, catalytic cooperativity in heterobimetallic complexes has been recently reviewed [69]. 

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