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- W2334499655 endingPage "1613" @default.
- W2334499655 startingPage "1603" @default.
- W2334499655 abstract "We report the redox, absorption, and emission characteristics of the tris(1,10-phenanthroline)ruthenium(II) complexes [Ru(phen)3]2+ bearing a (dimesityl)boryldurylethynyl (DBDE) charge-transfer (CT) unit at the 4 (4BRu2+) or 5 (5BRu2+) position of one of the three phen ligands. In acetonitrile at 298 K, 4BRu2+ showed absorption and emission maximum wavelengths at 473 and 681 nm, respectively, which were shifted to longer wavelengths by 25 and 74 nm, respectively, compared with the relevant value of 5BRu2+, 448 and 607 nm, respectively. The effects of a fluoride ion on the absorption and emission spectra of the complexes demonstrated that the CT interaction between the π-electron system in the phen ligand (π(aryl)) and the vacant p orbital on the boron atom (p(B)) in the DBDE group (i.e., π(aryl)−p(B) CT) participated in the excited states of the complexes in addition to the Ru(II)-to-phen metal-to-ligand CT (MLCT) interaction. Reflecting such synergistic MLCT/π(aryl)−p(B) CT, both 4BRu2+ and 5BRu2+ exhibited intense emission at 298 K with a quantum yield of 0.11. Furthermore, the emission lifetime of 4BRu2+ was as long as 12 μs and almost independent of the temperature (T = 280−330 K). The present study indicated that the nonemissive dd excited triplet state did not participate to nonradiative decay in the MLCT excited triplet state of 4BRu2+. The effects of the synergistic MLCT/π(aryl)−p(B) CT interactions on the redox, absorption/emission, and photophysical characteristics of 4BRu2+ and 5BRu2+ are discussed in detail." @default.
- W2334499655 created "2016-06-24" @default.
- W2334499655 creator A5003733957 @default.
- W2334499655 creator A5032000225 @default.
- W2334499655 creator A5048279225 @default.
- W2334499655 creator A5063169869 @default.
- W2334499655 date "2011-01-31" @default.
- W2334499655 modified "2023-10-12" @default.
- W2334499655 title "Long-Lived and Temperature-Independent Emission from a Novel Ruthenium(II) Complex Having an Arylborane Charge-Transfer Unit" @default.
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