Daniel S. Tyson

Ruthenium(II) complex with a notably longexcited state lifetime

A new Ru(II) diimine complex, [Ru(5-pyrenyl-1,10-phenanthroline)]3(PF6)2 ([Ru(py-phen)3]2+), possesses a room temperature excited state lifetime of 148 ± 8 μs.

Synthesis and photophysics of ruthenium(II) complexes with multiple pyrenylethynylene subunits

We describe the synthesis and photophysical properties of new Ru(II) complexes bearing different numbers of pyrenylethynylene substituents in either the 5 or 5,5′ positions of 2,2′-bipyridine. Static and dynamic absorption and luminescence measurements reveal the nature of the lowest excited states in each molecule. The 5-substituted complexes display behavior dominated by triplet intraligand π,π* excited states, generating long-lived room temperature phosphorescence in the red. While the photophysical properties in the 5,5′-substituted case are still largely influenced by triplet intraligand π,π* excited states, the data suggest the possibility of an excited state manifold composed of “mixed” intraligand and charge transfer character.