title: Synthesis and properties of new phosphorescent red light-excitable platinum(II) and palladium(II) complexes with Schiff bases for oxygen sensing and triplet-triplet annihilation-based upconversion.
abstract: New Pt(II) and Pd(II) complexes with donor-acceptor Schiff bases are conveniently prepared in only two steps. The complexes efficiently absorb in the red part of the spectrum (ε > 10(5) M(-1) cm(-1)) and show moderate to strong room-temperature phosphorescence in the near-infrared (NIR) region. Particularly, Pt(II) complexes possess phosphorescence quantum yields (Φ) of ~10%, but the emission of the respective Pd(II) complexes is less efficient (Φ ≈ 1%-2%). The complexes exhibit solvatochromic behavior, in which the absorption and emission spectra shift bathochromically in polar solvents. The Pt(II) complexes are embedded in polystyrene to produce oxygen-sensing materials. The Pd(II) and Pt(II) complexes are demonstrated to be efficient sensitizers in triplet-triplet annihilation-based upconversion systems.
authors.affiliation: Institute of Analytical Chemistry and Food Chemistry, Graz University of Technology, Stremayrgasse 9, 8010, Graz, Austria. sergey.borisov@tugraz.at
authors.forename: Sergey M
authors.initials: SM
authors.lastname: Borisov
authors.forename: Robert
authors.initials: R
authors.lastname: Saf
authors.forename: Roland
authors.initials: R
authors.lastname: Fischer
authors.forename: Ingo
authors.initials: I
authors.lastname: Klimant
mesh_terms: D018360:Crystallography, X-Ray; D008027:Light; D049408:Luminescent Agents / Q000138:chemical synthesis / Q000737:chemistry*; D008163:Luminescent Measurements; D008958:Models, Molecular; D015394:Molecular Structure; D009944:Organoplatinum Compounds / Q000138:chemical synthesis / Q000737:chemistry*; D010100:Oxygen / Q000032:analysis*; D010165:Palladium / Q000737:chemistry*; D010984:Platinum / Q000737:chemistry*; D011137:Polystyrenes / Q000737:chemistry; D012545:Schiff Bases / Q000737:chemistry*
chemical_list: D049408:Luminescent Agents; D009944:Organoplatinum Compounds; D011137:Polystyrenes; D012545:Schiff Bases; D010984:Platinum; D010165:Palladium; D010100:Oxygen