Excited State Interactions in Electropolymerized Thin Films of RuII, OsII, and ZnII Polypyridyl Complexes
| Autor: | B. Patrick Sullivan, Jonathan V. Caspar, Sharon Gould, James R. Gardner, Robert L. Leasure, Laura A. Worl, Martin Devenney, Thomas J. Meyer, Ana R. Guadalupe |
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| Rok vydání: | 1997 |
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| Zdroj: | The Journal of Physical Chemistry A. 101:4535-4540 |
| ISSN: | 1520-5215 1089-5639 |
| DOI: | 10.1021/jp971076t |
| Popis: | Emission from thin films of poly[Ru(vbpy)3](PF6)2 (vbpy = 4-methyl-4‘-vinyl-2,2‘-bipyridine) prepared by reductive electropolymerization on ITO (Sn:In2O3) is dominated by time-dependent effects and dramatically reduced excited state lifetimes compared to related monomers. The origins of these effects have been investigated by photophysical measurements on a series of copolymeric films containing mixtures of the ZnII, RuII, and OsII forms of poly[M(vbpy)3](PF6)2. In copolymeric RuII and OsII films, facile energy transfer occurs from RuII to OsII. Dilution of RuII by ZnII in copoly-χ[Ru(vbpy)3](PF6)2,(1 − χ)[Zn(vbpy)3](PF6)2 (χ = mole fraction of RuII) mixtures is accompanied by an increase in emission energy and average excited state lifetime. These results point to a quenching mechanism in poly[Ru(vbpy)3](PF6)2 arising from facile energy transfer to low-energy, short-lived “trap sites”. The trap sites may be created by electronic coupling between special pairs of adjacent complexes present in small amount... |
| Databáze: | OpenAIRE |
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