Mechanistic Insights into Oxygen Quenching and Singlet Oxygen Production by Osmium(II) Phenanthroline Derivatives: The Roles of Partial Charge Transfer and Reorganization Energy
Abstract
This study investigates the photophysical properties and oxygen-quenching dynamics of a series of osmium(II) 1,10-phenanthroline derivatives. The complexes demonstrate broad metal-to-ligand charge-transfer (MLCT) absorption and emit from the triplet state ( 3 MLCT) in acetonitrile with lifetimes ranging from 44.2 to 180.7 ns and luminescence quantum yield, Φ L, in the range 0.9 × 10 –3 to 3.75 × 10 –2 . Oxygen quenching of the 3 MLCT state occurs with rate constants, k q, in the range 2.2–9.4 × 10 9 M –1 s –1 in accordance with the spin statistical factor being
Fields of Study & Subjects
Organic Light-Emitting Diodes Research
Metal-Catalyzed Oxygenation Mechanisms
Magnetism in coordination complexes
Publication details
- Journal / source
- Inorganic Chemistry
- Publisher
- American Chemical Society (ACS)
- Volume
- 65
- Issue
- 20
- Pages
- 11165–11179
- Publication date
- 7 May 2026
- Language
- EN