Journal
JOURNAL OF PHYSICAL CHEMISTRY B
Volume 117, Issue 12, Pages 3428-3438Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp400514r
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Funding
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-FG02-06ER15788, DE-SC0001011]
- National Science Foundation
- UNC EFRC Center for Solar Fuels
- Energy Frontier Research Center
- UNC SERC
- U.S. Department of Energy, Office of Energy Efficiency & Renewable Energy [DE-EE0003188]
- Direct For Mathematical & Physical Scien
- Division Of Chemistry [0957215] Funding Source: National Science Foundation
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In semirigid PEG-DMA550 films with the added anthracene derivatives PEG-An and Acr-An, energy transfer quenching of the metal-to-ligand charge transfer excited state Ru(bpy)(3)(2+)* to give -(3)An occurs by both rapid, static, and slow, diffusional quenching processes. The appearance of -(3)An was verified by transient absorption measurements. The kinetics of the two quenching processes have been analyzed by a Stern-Volmer kinetic analysis. The data for static quenching are consistent with energy transfer quenching with a distance dependence consistent with Dexter (exchange) energy transfer. On the basis of this analysis Bohr radii were found to be 26 and 11 angstrom for PEG-An and Acr-An, respectively. Evidence for triplet-triplet annihilation between triplet anthracene excited states in the films was obtained from the concentration dependences of excited-state decay. These results provide evidence for long-range energy migration between derivatized anthracenes in rigid, cross-linked PEG-DMASSO films.
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