Recent Advances in Synthesis of Molecular Heteroleptic Osmium and Iridium Phosphorescent Emitters

The application of new procedures organometallic synthesis based on alternative starting complexes has given rise to a significant enhancement in the preparation osmium(IV), osmium(II), and iridium(III) emitters, since 2012. choice precursors should be done taking into account its ligands, they may cooperate emitter synthesis. Three different functions are clearly pointed out revised procedures: ligands compounds can direct selectivity competitive ruptures ?-bonds chromophores, without having participation activation; contrary, directly participate generation ligand, being part coordinated group; also act as internal base ?-bond heterolytic activation reactions. In addition, ability polyhydrides OsH6(PiPr3)2 IrH5(PiPr3)2 activate C?H bonds is one determining factors success many cases.