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Abstract
The photophysics of bis(4,4′-di-tert-butyl-2,2′-bipyridine-κ2N,N′)[2-(4-carboxyphenyl)-4,5-bis(p-tolylimino-κN)imidazolato]ruthenium(II) hexafluorophosphate is investigated, both in solution and attached to a nanocrystalline TiO2 film. The studied substitution pattern of the 4H-imidazole ligand is observed to block a photoinduced structural reorganization pathway within the 4H-imidazole ligand that has been previously investigated. Protonation at the 4H-imidazole ring decreases the excited-state lifetime in solution. When the unprotonated dye is anchored to TiO2, photoinduced electron injection occurs from thermally nonrelaxed triplet metal-to-ligand charge transfer (3MLCT) states with a characteristic time constant of 0.5 ps and an injection efficiency of roughly 25 %. Electron injection from the subsequently populated thermalized 3MLCT state of the dye does not take place. The energy of this state seems to be lower than the conduction band edge of TiO2.
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Authors (6)
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Julian Schindler
- Jena University Institute of Physical Chemistry and Abbe Center of Photonics
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Stephan Kupfer
- Jena University Institute of Physical Chemistry and Abbe Center of Photonics
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Maria WäCHTLER
- IPHT Jena
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Sven Rau
- University Ulm Institute of Inorganic Chemistry
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Benjamin Dietzek
- Jena University Institute of Physical Chemistry and Abbe Center of Photonics
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Details
- Category:
- Articles
- Type:
- artykuł w czasopiśmie wyróżnionym w JCR
- Published in:
-
CHEMPHYSCHEM
no. 16,
edition 5,
pages 1061 - 1070,
ISSN: 1439-4235 - Language:
- English
- Publication year:
- 2015
- Bibliographic description:
- Schindler J., Kupfer S., Wächtler M., Guthmuller J., Rau S., Dietzek B.: Photophysics of a Ruthenium 4H-Imidazole Panchromatic Dye in Interaction with Titanium Dioxide// CHEMPHYSCHEM. -Vol. 16, iss. 5 (2015), s.1061-1070
- DOI:
- Digital Object Identifier (open in new tab) 10.1002/cphc.201402856
- Verified by:
- Gdańsk University of Technology
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