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Photophysics of Ru(II) Dyads Derived from Pyrenyl-Substitued Imidazo[4,5-f][1,10]phenanthroline Ligands.
Abstract
The photophysics of a series of Ru(II) dyads based on the 2-(1-pyrenyl)-1H-imidazo[4,5-f][1,10]-phenanthroline ligand was investigated. The ability of these metal complexes to intercalate DNA and induce cell death upon photoactivation makes them attractive photosensitizers for a range of photobiological applications, including photodynamic therapy. In the present study, time-resolved transient absorption and emission spectroscopy were used to interrogate the photoinduced processes that follow metal-to-ligand charge transfer excitation of the complexes in solution. It was found that energy transfer to pyrene-localized intraligand triplet states, facilitated by torsional motion of the pyrene moiety relative to the imidazo[4,5-f][1,10]phenanthroline ligand, was an important relaxation pathway governing the photophysical dynamics in this class of compounds. Biphasic decay kinetics were assigned to spontaneous (pre-equilibrium) and delayed emission, arising from an equilibrium established between (3)MLCT and (3)IL states. TDDFT calculations supported these interpretations.
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Authors (9)
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Christian Reichardt
- Jena University Institute of Physical Chemistry and Abbe Center of Photonics
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Mitch Pinto
- Acadia University Department of Chemistry
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Maria Wachtler
- IPHT Jena
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Mat Stephenson
- Acadia University Department of Chemistry
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Stephan Kupfer
- Jena University Institute of Physical Chemistry and Abbe Center of Photonics
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Tariq Sainuddin
- Acadia University Department of Chemistry
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Sherri A. Mcfarland
- Acadia University Department of 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:
-
JOURNAL OF PHYSICAL CHEMISTRY A
no. 119,
pages 3986 - 3994,
ISSN: 1089-5639 - Language:
- English
- Publication year:
- 2015
- Bibliographic description:
- Reichardt C., Pinto M., Wachtler M., Stephenson M., Kupfer S., Sainuddin T., Guthmuller J., Mcfarland S., Dietzek B.: Photophysics of Ru(II) Dyads Derived from Pyrenyl-Substitued Imidazo[4,5-f][1,10]phenanthroline Ligands.// JOURNAL OF PHYSICAL CHEMISTRY A. -Vol. 119, (2015), s.3986-3994
- DOI:
- Digital Object Identifier (open in new tab) 10.1021/acs.jpca.5b01737
- Verified by:
- Gdańsk University of Technology
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