Journal
JOURNAL OF PHYSICAL CHEMISTRY A
Volume 120, Issue 32, Pages 6379-6388Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpca.6b05957
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Funding
- Fonds der Chemischen Industrie
- German Science Foundation
- Landesgraduiertenstipendium
- Natural Sciences and Engineering Council of Canada
- Canadian Institutes of Health Research
- Canadian Foundation for Innovation
- Nova Scotia Research and Innovation Trust
- Acadia University
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The influence of ligand protonation on the photophysics of a ruthenium (Ru) dyad bearing the 2-(1-pyrenyl)-H-imidazo[4,5-f][1,10]-phenanthroline (ippy) ligand was investigated by time-resolved transient absorption spectroscopy. It was found that changes in the protonation state of the imidazole group led to changes in the electronic configuration of the lowest lying excited state. Formation of the fully deprotonated imidazole anion resulted in excited state signatures that were consistent with a low-lying intraligand (IL) triplet state. This assignment was supported by time-dependent density functional theory (TDDFT) calculations. IL triplet states have been suggested to be potent mediators of photodynamic effects. Thus, these results are of interest in the design of Ru metal complexes as photosensitizers (PSs) for photodynamic therapy (PDT).
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