Luminescent bis-cyclometallated iridium(III) complexes containing phosphine-based ligands: Influence of the P^N bridge. (28th January 2015)

• Record Type: Journal Article
• Authors: Aranda, Braulio; Aguirre, Pedro; Moya, Sergio A.; Bonneau, Mickaële; Williams, J.A. Gareth; Toupet, Loic; Escadeillas, Muriel; Le Bozec, Hubert; Guerchais, Véronique
• Is Part Of: Polyhedron. Volume 86(2015)
• Page Start: 120
• Page End: 124
• Publication Date: 2015-01-28
• Subjects: Iridium complexes -- Bis-cyclometallated complexes -- Phosphine ligands -- Luminescence -- Blue phosphors; Chemistry, Inorganic -- Periodicals; Chimie inorganique -- Périodiques; Organometaalverbindingen; Anorganische chemie; 546.05
• DOI: 10.1016/j.poly.2014.06.027
• Languages: English
• ISSNs: 0277-5387

Abstract

Graphical abstract: 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 (Ph2 Pqn, L1 ), 2-(diphenylphosphinoamino)pyridine (Ph2 PNHpy, L2 ) and 2-(diphenylphosphinoamino)pyrimidine (Ph2 PNHpym, L3 ), were prepared, and their X-ray crystallography, and photoluminescence were investigated. The complexes2 –3 featuring the P –NH– N ligands emit in the blue region, whereas the P –C Ar – N -incorporating complex1 displays orange photoluminescence. Abstract: 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 (Ph2 Pqn, L1 ), 2-(diphenylphosphinoamino)pyridine (Ph2 PNHpy, L2 ) or 2-(diphenylphosphinoamino) pyrimidine (Ph2 PNHpym, L3 ) as P^N-ligands, were prepared, and their crystal structures and photoluminescence were investigated. The substitution of an "aromatic C Ar " (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 complexes2 –3 featuring the P– NH – N ligand emit in the blue region, whereas complex1 incorporating the P– C Ar –N unit displays orange photoluminescence.