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- Title
Luminescent Palladium(II) Complexes with π-Extended Cyclometalated [RC^N^NR′] and Pentafluorophenylacetylide Ligands: Spectroscopic, Photophysical, and Photochemical Properties.
- Authors
Chow, Pui ‐ Keong; To, Wai ‐ Pong; Low, Kam ‐ Hung; Che, Chi ‐ Ming
- Abstract
A series of cyclometalated PdII complexes that contain π-extended RC^N^NR′ (RC^N^NR′=3-(6′-aryl-2′-pyridinyl)isoquinoline) and chloride/pentafluorophenylacetylide ligands have been synthesized and their photophysical and photochemical properties examined. The complexes with the chloride ligand are emissive only in the solid state and in glassy solutions at 77 K, whereas the ones with the pentafluorophenylacetylide ligand show phosphorescence in the solid state ( λmax=584-632 nm) and in solution ( λmax=533-602 nm) at room temperature. Some of the complexes with the pentafluorophenylacetylide ligand show emission with λmax at 585-602 nm upon an increase in the complex concentration in solutions. These PdII complexes can act as photosensitizers for the light-induced aerobic oxidation of amines. In the presence of 0.1 mol % PdII complex, secondary amines can be oxidized to the corresponding imines with substrate conversions and product yields up to 100 and 99 %, respectively. In the presence of 0.15 mol % PdII complex, the oxidative cyanation of tertiary amines could be performed with product yields up to 91 %. The PdII complexes have also been used to sensitize photochemical hydrogen production with a three-component system that comprises the PdII complex, [Co(dmgH)2(py)Cl] (dmgH=dimethylglyoxime; py=pyridine), and triethanolamine, and a maximum turnover of hydrogen production of 175 in 4 h was achieved. The excited-state electron-transfer properties of the PdII complexes have been examined.
- Subjects
PALLADIUM; PHENYLACETATES; ISOQUINOLINE synthesis; PHOTOCHEMICAL research; LIGANDS (Chemistry); PHOTOSENSITIZERS; SECONDARY amines
- Publication
Chemistry - An Asian Journal, 2014, Vol 9, Issue 2, p534
- ISSN
1861-4728
- Publication type
Article
- DOI
10.1002/asia.201301059