863288-13-5Relevant academic research and scientific papers
Platinum(II) 1,10-phenanthroline complexes of acetylides containing redox-active groups
Siemeling, Ulrich,Bausch, Kirstin,Fink, Heinrich,Bruhn, Clemens,Baldus, Marc,Angerstein, Brigitta,Plessow, Regina,Brockhinke, Andreas
, p. 2365 - 2374 (2005)
The new diimine ligand 3,8-di-n-pentyl-4,7-di(phenylethynyl)-1,10- phenanthroline (1) was used for the synthesis of a range of PtII complexes, viz. [Pt(1)Cl2], [Pt(1)(C≡C-Ph)2], [Pt(1)(C≡C-Fc)2] and [Pt(1)(C≡C-p-C6H 4-C≡C-Fc)2] (Fc = ferrocenyl). Crystal structure analyses were performed for [Pt(1)Cl2] and [Pt(1)(C≡C-Ph) 2] and revealed that the di(acetylide) π-tweezer of the latter binds a molecule of chloroform through C-H ... π hydrogen bonds. The redox and optical properties of 1 and its complexes were investigated by (spectro-)electrochemistry, UV-Vis and luminescence spectroscopy, and an energy level diagram was derived for [Pt(1)(C≡C-Fc)2] and related compounds on the basis of the data collected. The ferrocenyl-substituted Pt II complexes are donor-sensitiser assemblies. Intramolecular quenching of the photoexcited Ptii diimine unit leads to very short luminescence lifetimes for [Pt(1)(C≡C-p-C6H4- C≡C-Fc)2] (2 ns) and [Pt(1)(C≡C-Fc)2] (0.3 ns), as opposed to [Pt(1)(C≡C-Ph)2] (0.7 μs). Excimer formation has been observed for [Pt(1)(C≡C-Ph)2] at room temperature in dichloromethane and at low temperatures in frozen glassy dichloromethane and 2-methyltetrahydrofuran solution, but not in the solid state. The Royal Society of Chemistry 2005.
