Abstract
Novel Ir(III) cyclometalates, (dnpy) 2Ir(acac) (2) and fac‐Ir(dnpy)3 (3), supported by 2‐(1,2‐dihydronaphthalen‐4‐yl)pyridyl ligand (dnpy) were synthesized and characterized. X‐ray diffraction study on 3 revealed facial arrangement of three dnpy ligands around the Ir center. Photoluminescence (PL) spectra of 2 exhibited orange emission centered at 590 nm, which is almost similar to that observed for 2‐naphthylpyridine complex, (napy) 2Ir(acac) ( III ). In contrast, compound 3 displayed blue‐shifted, yellow emission at 550 nm. Tris‐complex 3 showed higher quantum efficiencies than 2 in both the solution and film states. Cyclic voltammetry measurements indicated that replacing naphthyl with 1,2‐dihydronaphthyl ring raises both the metal‐centered HOMO level and ligand‐centered LUMO level in 2 and 3. It was suggested that 1,2‐dihydronaphthyl ring has a stronger electron‐donating effect than naphthyl ring, while the π* orbital of dnpy ligand is less stabilized due to partial conjugation of the dihydronaphthyl ring.
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