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Pyrene fluorescence in 2,7-di(4-phenylethynyl)pyrene-bridged bis(alkenylruthenium) complexes.
- Source :
-
Dalton Transactions: An International Journal of Inorganic Chemistry . 1/7/2024, Vol. 53 Issue 1, p251-259. 9p. - Publication Year :
- 2024
-
Abstract
- Complexes PyrDPE-RuCl and PyrDPE-Ruacac with a π-extended 2,7-di(4-phenylethynyl)pyrene linker undergo simultaneous one-electron oxidations of their {Ru}-styryl entities. The absence of an intervalence charge-transfer (IVCT) band at intermediate stages, where the mixed-valent, singly oxidized radical cation is present, and spin density confinement to the terminal styryl ruthenium site(s) are tokens of a lack of electronic coupling between the {Ru} entities across the π-conjugated linker. The close similarity of the linker-based π → π* bands in the complexes and the free ligand and their insensitivity towards oxidations at the terminal sites indicate that the central pyrenyl fluorophore is electronically decoupled from the electron-rich {Ru}-styryl termini. As a consequence, the complexes offer stable pyrene-based fluorescence emissions at 77 K, which are red-shifted from that of the linker. [ABSTRACT FROM AUTHOR]
- Subjects :
- *PYRENE
*FLUORESCENCE
*RADICAL cations
*BIG bands
*RUTHENIUM
Subjects
Details
- Language :
- English
- ISSN :
- 14779226
- Volume :
- 53
- Issue :
- 1
- Database :
- Academic Search Index
- Journal :
- Dalton Transactions: An International Journal of Inorganic Chemistry
- Publication Type :
- Academic Journal
- Accession number :
- 174293655
- Full Text :
- https://doi.org/10.1039/d3dt03114d