Luminescent bis-cyclometallated iridium(III) complexes containing phosphine-based ligands: Influence of the P^N bridge

• Published in: Polyhedron Vol. 86; pp. 120 - 124
• Main Authors: Aranda, Braulio, Aguirre, Pedro, Moya, Sergio A., Bonneau, Mickaële, Williams, J.A. Gareth, Toupet, Loic, Escadeillas, Muriel, Le Bozec, Hubert, Guerchais, Véronique
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01-01-2015; Elsevier
• Subjects: Bis-cyclometallated complexes; Blue phosphors; Chemical Sciences; Inorganic chemistry; Iridium complexes; Luminescence; Phosphine ligands; Physics; Phosphine ligands; Iridium complexes; Blue phosphors; Bis-cyclometallated complexes; Luminescence
• ISSN: 0277-5387; 0277-5387
• DOI: 10.1016/j.poly.2014.06.027

Three cationic bis-cyclometallated iridium complexes with 4-methyl-2-phenylpyridine (ppyMe) as the C^N-cyclometallated ligands and the P^N-ligands, 8-(diphenylphosphino)quinoline (Ph2Pqn, L1), 2-(diphenylphosphinoamino)pyridine (Ph2PNHpy, L2) and 2-(diphenylphosphinoamino)pyrimidine (Ph2PNHpym, L3), were prepared, and their X-ray crystallography, and photoluminescence were investigated. The complexes 2–3 featuring the P–NH–N ligands emit in the blue region, whereas the P–CAr–N-incorporating complex 1 displays orange photoluminescence. [Display omitted]
Three cationic bis-cyclometallated iridium complexes [Ir(C^N-ppyMe)2(P^N)][PF6](1–3) with 4-methyl-2-phenylpyridine (ppyMe) as the C^N-cyclometallated ligands and 8-(diphenylphosphino)quinoline (Ph2Pqn, L1), 2-(diphenylphosphinoamino)pyridine (Ph2PNHpy, L2) or 2-(diphenylphosphinoamino) pyrimidine (Ph2PNHpym, L3) as P^N-ligands, were prepared, and their crystal structures and photoluminescence were investigated. The substitution of an “aromatic CAr” (of a quinolyl group) by an “NH” bridge between the phosphine and imine ligating units of the P^N ligand dramatically changes the luminescence characteristics of the resulting complexes. The complexes 2–3 featuring the P–NH–N ligand emit in the blue region, whereas complex 1 incorporating the P–CAr–N unit displays orange photoluminescence.