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- Title
Palladium(II) Acetylide Complexes with Pincer-Type Ligands: Photophysical Properties, Intermolecular Interactions, and Photo-cytotoxicity.
- Authors
Hung, Faan ‐ Fung; Wu, Shui ‐ Xing; To, Wai ‐ Pong; Kwong, Wai ‐ Lun; Guan, Xiangguo; Lu, Wei; Low, Kam ‐ Hung; Che, Chi ‐ Ming
- Abstract
Two classes of cationic palladium(II) acetylide complexes containing pincer-type ligands, 2,2′:6′,2′′-terpyridine (terpy) and 2,6-bis(1-butylimidazol-2-ylidenyl)pyridine (C^N^C), were prepared and structurally characterized. Replacing terpy with the strongly σ-donating C^N^C ligand with two N-heterocyclic carbene (NHC) units results in the PdII acetylide complexes displaying phosphorescence at room temperature and stronger intermolecular interactions in the solid state. X-ray crystal structures of [Pd(terpy)(C≡CPh)]PF6 ( 1) and [Pd(C^N^C)(C≡CPh)]PF6 ( 7) reveal that the complex cations are arranged in a one-dimensional stacking structure with pair-like PdII⋅⋅⋅PdII contacts of 3.349 Å for 1 and 3.292 Å for 7. Density functional theory (DFT) and time-dependent density functional theory (TD-DFT) calculations were used to examine the electronic properties. Comparative studies of the [Pt(L)(C≡CPh)]+ analogs by 1H NMR spectroscopy shed insight on the intermolecular interactions of these PdII acetylide complexes. The strong Pd−Ccarbene bonds render 7 and its derivative sufficiently stable for investigation of photo-cytotoxicity under cellular conditions.
- Subjects
PALLADIUM; ACETYLIDES; LIGANDS (Chemistry); INTERMOLECULAR interactions; DENSITY functional theory
- Publication
Chemistry - An Asian Journal, 2017, Vol 12, Issue 1, p145
- ISSN
1861-4728
- Publication type
Article
- DOI
10.1002/asia.201601414