title: Cationic, luminescent cyclometalated iridium(III) complexes based on substituted 2-phenylthiazole ligands.
abstract: Ten cationic heteroleptic iridium(III) complexes, [Ir(emptz)2(N^N)](PF6) were prepared from a cyclometalated iridium bridged-chloride dimer involving two ethyl-4-methylphenylthiazole-5-carboxylate (emptz) ligands. One X-ray crystallographic study was undertaken where the ancillary N^N ligand was 4,7-diphenyl-1,10-phenanthroline and revealed the anticipated structure, showing a distorted octahedral coordination geometry at Ir(III). The complexes were visibly luminescent with modestly structured emission at 540-590 nm and lifetimes (60-340 ns) consistent with phosphorescence. TD-DFT calculations suggest that strong MLCT character contributes to the visible absorption characteristics, whilst the moderately structured emission profiles indicate a (3)MLCT/(3)IL admixture of states to the phosphorescence.
authors.affiliation: School of Chemistry, Main Building, Cardiff University, Cardiff CF10 3AT, UK. popesj@cardiff.ac.uk.
authors.forename: Emily C
authors.initials: EC
authors.lastname: Stokes
authors.forename: Emily E
authors.initials: EE
authors.lastname: Langdon-Jones
authors.forename: Lara M
authors.initials: LM
authors.lastname: Groves
authors.forename: James A
authors.initials: JA
authors.lastname: Platts
authors.forename: Peter N
authors.initials: PN
authors.lastname: Horton
authors.forename: Ian A
authors.initials: IA
authors.lastname: Fallis
authors.forename: Simon J
authors.initials: SJ
authors.lastname: Coles
authors.forename: Simon J A
authors.initials: SJ
authors.lastname: Pope