Synthesis and Excited-State Photodynamics of Perylene−Porphyrin Dyads. 1. Parallel Energy and Charge Transfer via a Diphenylethyne Linker
| Autor: | Sung Ik Yang, Mark A. Miller, Jyoti Seth, Jonathan S. Lindsey, Sreedharan Prathapan, Dewey Holten,§ and, David F. Bocian |
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| Rok vydání: | 2001 |
| Předmět: | |
| Zdroj: | The Journal of Physical Chemistry B. 105:8237-8248 |
| ISSN: | 1520-5207 1520-6106 |
| DOI: | 10.1021/jp010335i |
| Popis: | The photophysical properties of a perylene−porphyrin dyad have been examined with the aim of using this construct for molecular photonics applications. The dyad consists of a perylene-bis(imide) dye (PDI) connected to a zinc porphyrin (Zn) via a diphenylethyne linker (pep). In both polar and nonpolar solvents, the photoexcited perylene unit (PDI*) decays very rapidly (lifetimes of 2.5 (toluene) and 2.4 ps (acetonitrile)) by energy transfer to the porphyrin, forming PDI−pep−Zn* in high yield (80%, toluene; 70% acetonitrile), and hole transfer to the porphyrin, forming PDI-−pep−Zn+ in lesser yield (20%, toluene; 30% acetonitrile). In both toluene and acetonitrile, the Zn* excited state subsequently decays with a lifetime of 0.4 ns primarily (80%) by electron transfer to the perylene (forming PDI-−pep−Zn+). In the nonpolar solvent (toluene), the PDI-−pep−Zn+ charge-transfer product has a lifetime of >10 ns and decays by charge recombination primarily to the ground state but also by thermal repopulation of th... |
| Databáze: | OpenAIRE |
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