Ruthenium(II)-Cored Polythiophene Dendrimers
| Autor: | Prasad Taranekar, Saengrawee Sriwichai, Greg Krueger, Suxiang Deng, Ruifa Zong, Rigoberto C. Advincula, Randolph P. Thummel |
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| Rok vydání: | 2011 |
| Předmět: | |
| Zdroj: | Chemistry of Materials. 23:3302-3311 |
| ISSN: | 1520-5002 0897-4756 |
| DOI: | 10.1021/cm200228p |
| Popis: | We report the synthesis and characterization of ruthenium(II)-cored polythiophene dendrimers. Four new redox-active ruthenium(II) pyridine oligothiophene dendritic complexes that fluoresce in the near-infrared region have been synthesized, and their absorption spectra, fluorescence properties, and redox behavior have been investigated. The dendritic ligands phen3T and phen7T containing 1,10-phenanthroline as chelating sites and two oligothiophene dendrons (3T6COMe and 7T6COMe) have been synthesized and employed. The metal–polythiophene dendrimers investigated here are [Ru(bpy)2(phen3T)]2+, [Ru(bpy)2(phen7T)]2+, [Ru(phen3T)3]2+, and [Ru(phen7T)3]2+. Upon addition of acid, the charge transfer absorption bands of free dendritic ligands are significantly red-shifted and the fluorescence is greatly quenched. The Ru(II) polythiophene dendrimers exhibit very strong metal-to-ligand charge transfer (MLCT) absorption and enhanced absorption in the UV region and can be regarded as better light-harvesting species. Th... |
| Databáze: | OpenAIRE |
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