Direct Observation of Temperature-Dependent Excited-State Equilibrium in Dinuclear Ruthenium Terpyridine Complexes Bearing Electron-Poor Bridging Ligands
| Autor: | Ulrich S. Schubert, Florian Schlütter, Benjamin Dietzek, Julien Guthmuller, Christoph Hunger, Ronald Siebert, Jürgen Popp, Leticia González, Andreas Winter |
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| Rok vydání: | 2011 |
| Předmět: |
chemistry.chemical_element
Bridging ligand Photochemistry Surfaces Coatings and Films Electronic Optical and Magnetic Materials Ruthenium chemistry.chemical_compound Delocalized electron General Energy chemistry Excited state Density functional theory Emission spectrum Physical and Theoretical Chemistry Terpyridine Spectroscopy |
| Zdroj: | The Journal of Physical Chemistry C. 115:12677-12688 |
| ISSN: | 1932-7455 1932-7447 |
| DOI: | 10.1021/jp203958f |
| Popis: | Dinuclear ruthenium–terpyridine complexes, bearing highly conjugated bridging ligands, have been investigated by time- and temperature-dependent emission spectroscopy, femtosecond time-resolved transient-absorption spectroscopy, and time-dependent density functional theory calculations. These terpyridine compounds show room-temperature emission around 640 nm and lifetimes between 140 and 230 ns. Reduction of the temperature results in an overall increase of emission lifetime. However, the specific temperature dependence of the luminescence lifetime depends on the particular bridging ligand. This ligand-specific behavior is found to correlate with the electronic structure of the ligand, which indicates an excited-state equilibrium between a highly delocalized 3MLCT and a ligand-centered 3ππ* excited-state. Due to this equilibrium a prolonged room-temperature lifetime is observed. |
| Databáze: | OpenAIRE |
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