title: Deep-red luminescence and efficient singlet oxygen generation by cyclometalated platinum(II) complexes with 8-hydroxyquinolines and quinoline-8-thiol.
abstract: The synthesis and photophysical study of (C/\N)Pt(II)Q complexes, where C/\N is a bidentate cyclometalating ligand and Q is 8-hydroxyquinoline or quinoline-8-thiol, are presented. The compounds were obtained as a single isomer with N atoms of the C/\N and Q ligands trans-coordinated to the Pt(II) center as shown by X-ray crystallography. These chromophores absorb intensely in the visible region and emit in the deep-red spectral region from a quinolate-centered triplet intraligand charge-transfer excited state. The emission maxima are in the range 675-740 nm, with the quantum yields and lifetimes of up to 0.82% and 5.3 mus, respectively, in deoxygenated organic solvents at room temperature. These complexes are efficient photosensitizers of singlet oxygen in air-saturated solutions, with yields up to 90%.
authors.affiliation: Department of Chemistry, University of Sheffield, Sheffield S3 7HF, United Kingdom.
authors.forename: Nail M
authors.initials: NM
authors.lastname: Shavaleev
authors.forename: Harry
authors.initials: H
authors.lastname: Adams
authors.forename: Jonathan
authors.initials: J
authors.lastname: Best
authors.forename: Ruth
authors.initials: R
authors.lastname: Edge
authors.forename: Suppiah
authors.initials: S
authors.lastname: Navaratnam
authors.forename: Julia A
authors.initials: JA
authors.lastname: Weinstein