Iridium complexes Schiff bases

The thermally stable, Schiff base complexes [M(PPD)(C1, ]-j H20 (M = Ir, Pt x = 4 PPD = p-Me2C6H4CH—N(CH2)3NH2) have been prepared characterization by IR spectroscopy shows the dimethylamino and free amino groups to be the coordinating sites. Further characterization by magnetic moment measurements and NMR and electronic spectral data indicates the iridium(IV) complex to be octahedral.568... 

Iridium(I) complexes with Schiff base ligands effectively transfer hydrogenate ketones. Use of optically active ligands allows asymmetric reduction of prochinal ketones to optically active alcohols ... 

Polystyrenes have also been used to support chromophores useful in organic light-emitting diodes (OLEDs). Week and coworkers have attached tris(2-phenylpyridine) iridium complexes to aminomethylated polystyrene using a Schiff base reaction, 4 [21]. There was no major diminution of the desirable luminescence properties of the iridium complexes (high emission quantum yields of 0.23 and lifetimes of about a microsecond). Similar results have been reported for aluminum and boron 8-hydroxy quinoline complexes tethered to polystyrene using Schiff base condensation [22]. 

The reaction between [Ir (H)3(AsPh3)2(CNQH4Me-/))] and the quadridentate Schiff bases AW -ethylenebis(salicylideneimine) (Hsalen) and A A -ethylenebis(acetylacetoneimine) (acacen) yield the iridium(II) complexes [Ir(AsPh3)(salen)(CNQH4Mc-p)] and [Ir(AsPh3)(ac-acenXCNCgH4Me-/>)], respectively. ... 

Other chiral metal catalysts such as iridium, osmium, and rhenium catalysts have also been utilized for asymmetric cyclopropanation. In particular, iridium catalyst gave exceptional enantio- and diastereoselectivities. Chiral Ir(III) salen complexes, which contain a-coordinated aryl ligands, were found to catalyze the cyclopropanation of st3rrene derivatives with TDA. Higher yields (99%), higher diastereoselectivity t/c = 1 99), and enantioselectivity (99% ee) were observed when the reactions were conducted at lower temperature (—78°C) (98). For osmium, an Schiff-based complex of [Os(fBu-salch)(OH)Cl] (H2tBu-salch... 

Mesomorphic Schiff-bases can also complex two square planar cw-[M(C02)]-moities with M=rhodium or iridium [117]. The complexes, 51, show SmA behavior. 

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