Intramolecular Electronic Energy Transfer in Ruthenium(II) Diimine Donor/Pyrene Acceptor Complexes Linked by a Single C−C Bond
| Autor: | Piotr Piotrowiak, Steven L. Curry, Xiaoqing Jin, Timothy R. Schatz, Jerald A. Simon, Russell H. Schmehl, Randolph P. Thummel |
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| Rok vydání: | 1997 |
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| Zdroj: | Journal of the American Chemical Society. 119:11012-11022 |
| ISSN: | 1520-5126 0002-7863 |
| DOI: | 10.1021/ja970069f |
| Popis: | The photophysical behavior of [(bpy)2Ru(L)]2+ complexes (L = 4-(1‘‘-pyrenyl)-2,2‘-bipyridine, bpy-pyr; 2-(1‘-pyrenyl)-1,10-phenanthroline, phen-pyr; and 2-(2‘-naphthyl)-1,10-phenanthroline, phen-nap) was investigated in solutions and frozen matrices. The conformation of the linked pyrene differs in the two complexes: The pyrene moiety is conformationally constrained to be nearly perpendicular to the phenanthroline in the phen-pyr complex while the pyrene in the bpy-pyr complex has much greater flexibility about the C−C bond linking the ligand and the pyrene. The 3MLCT excited state of the Ru(II) diimine complex and the 3(π → π*) state of the pyrenyl substituent are nearly isoenergetic; the 3MLCT state is the lowest energy state in the bpy-pyr complex, and the pyrene 3(π → π*) state is lower in energy for the phen-pyr complex. The bpy-pyr complex is unique in that the 3MLCT state has a very long lived luminescence (approximately 50 μs in degassed CH3CN). Luminescence decays for both pyrene containing comp... |
| Databáze: | OpenAIRE |
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