Homoleptic complexes iridium

Tsuboyama, A., Iwawaki, H., Furigori, M. et al. 2003. Homoleptic cyclometa-lated iridium complexes with highly efficient red phosphorescence and application to organic light-emitting diodes.. Am. Chem. Soc. 125 12971. 

Extremely high ECL efficiencies seem to be a common feature of the homoleptic-IrL3 as well as the heteroleptic-L2Ir(X) iridium(III) cyclometallated complexes. Extremely high ECL efficiencies (up to 0.55) were observed via ion annihilation between the electrochemically generated L2Ir(acac)+ or L2Ir(pico) + cations (where... 

A series of facial homoleptic cyclometalated iridium(III) complexes has been synthesized and their photophysical properties investigated. The MLCT emission of the complexes in toluene 298 K occurred at 558-652nm (To = 0.74-4.7 J,s). An OLED device that used [Ir(l-phenylisoquinolinato)3] as a phosphorescent dopant produced pure-red emission with very high efficiency. 

Different from the ruthenium system previously discussed, [Ir(COD)Cl]2 reacted with the electron-rich olefin (217) to afford the homoleptic organoiridium tricycle complex (223) with an increase of the iridium oxidation state from (I) to (III) (equation 41). This spontaneous orthometallation process... 

The homoleptic iridium(III) complex, /ac-tris[2-(3 -trimethylsilylphenyl)-5-trimethylsilylpyridinato]iridium [Ir(disppy)3], has been synthesized by Suzuki coupling reaction. The effect of the substitution of bulky silyl groups on the photophysical and electroluminescence properties of Ir(disppy)3 based device has also been investigated (Jung... 

An unusual double alkynyl-transfer processes occurs when the homoleptic cr-bonded ions [Pt(C CR)4] react with the solvento dicationic [MCp (PEt3)(acetone)2] to give neutral type S17-G complexes (PEt3)Cp Ir(/r-77 -.if-C CR)2Pt(C CR)2 (R = Ph, Bu, SiMc3), in which the organometallic r-Pt(C CR)2 unit is stabilized by 77 -bis(alkyne) interactions, as confirmed by X-ray diffraction. Similar reactions of the solvento complexes with < -[Pt(RF)2(C IlR)2] (R = Ph, SiMc3) reveal that a double alkynylation process takes place with the iridium... 

Regarding group 9, all the examples involve poly-NHC iridium(III) complexes two types of approaches in the use of di-NHC hgands in this context have been used so far. De Cola has synthesized homoleptic complexes of type 97 (Fig. 35) with a metalated CCC pincer di-NHC Hgand this species shows an emission quantum yield of 40% at 384 nm. Several other groups have instead used only one di-NHC coordinated as ancillary Hgand in bis(o-metalated-2-phenylpyridine)iridium(III) complexes of type 98. In these cases, the transition associated to the emission is mainly influenced by the phenylpyridine Hgand. 

---