Highly phosphorescent iridium complexes containing both tridentate bis(benzimidazolyl)-benzene or -pyridine and bidentate phenylpyridine: synthesis, photophysical properties, and theoretical study of Ir-bis(benzimidazolyl)benzene complex.

摘要: Novel mixed-ligand Ir(III) complexes, [Ir(L)(N∧C)X]n+ (L = N∧C∧N or N∧N∧N; X Cl, Br, I, CN, CH3CN, −CCPh; n 0 1), were synthesized, where bis(N-methylbenzimidazolyl)benzene (Mebib) and bis(N-phenylbenzimidazolyl)benzene (Phbib), N∧N∧N bis(N-methylbenzimidazolyl)pyridine (Mebip), N∧C phenylpyridine (ppy) derivatives. The X-ray crystal structures of [Ir(Phbib)(ppy)Cl] [Ir(Mebib)(mppy)Cl] [mppy 5-methyl-2-(2‘-pyridyl)phenyl] indicate that the nitrogen atom ppy ligand is located trans to coordinating carbon in Me- Phbib, while occupies position Cl. [Ir(Mebip)(ppy)Cl]+ showed a quasireversible Ir(III/IV) oxidation wave at +1.05 V, Ir [Ir(Mebib)(ppy)Cl], oxidized +0.42 V versus Fc/Fc+. introduction an Ir−C bond [Ir(Mebib)(ppy)Cl] induces large potential shift 0.63 negative direction. Further, [Ir(Mebib)(Rppy)X] was altered by substi...