American Chemical Society
ic061283k_si_003.cif (14.34 kB)

Deep-Red Luminescence and Efficient Singlet Oxygen Generation by Cyclometalated Platinum(II) Complexes with 8-Hydroxyquinolines and Quinoline-8-thiol

Download (14.34 kB)
posted on 2006-11-13, 00:00 authored by Nail M. Shavaleev, Harry Adams, Jonathan Best, Ruth Edge, Suppiah Navaratnam, Julia A. Weinstein
The synthesis and photophysical study of (CN)PtIIQ complexes, where CN 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 CN and Q ligands trans-coordinated to the PtII 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 μs, 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%.