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The synthesis of three neutral bis-cyclometalated iridium(III) complexes [Ir(pba) 2 (S^S)] (pbaH=4-(2-pyridyl)benzaldehyde; S^S=Et 2 NCS 2  −  ( 1 ),  i PrOCS 2  −  ( 2 ), ( n PrO) 2 PS 2  −  ( 3 )) from [{Ir( μ -Cl)(pba) 2 } 2 ] and the corresponding sodium or potassium dithiolates in methanol-dichloromethane is described. The composition of complexes  1–3  is discussed on the basis of  1 H NMR,  13 C NMR, IR, and mass spectroscopy, and the crystal structures of  1  and  3  were determined by X-ray crystallography. The absorption and emission spectra show that the [Ir(pba) 2 (S^S)] complexes may be effective candidates as green-emitting phosphorescent materials. The stability of the three cyclometalated iridium(III) complexes towards different transition metal ions was also investigated in acetonitrile-water solvent.

Syntheses, crystal structures and phosphorescence properties of cyclometalated iridium(III) bis(pyridylbenzaldehyde) complexes with dithiolate ligands