New Twist on the Light-Switch Effect: Controlling the Fate of Excited States with pH in a 4-Hydroxy-thiazol-extended Ruthenium(II) Dppz Complex
Müller C, Kaufmann M, Brandon MP, Cullen AA, Dietzek-Ivanšić B, Pryce MT (2023)
Publication Language: English
Publication Type: Journal article
Publication year: 2023
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Abstract
We present a pH-dependent study of the excited state dynamics of a novel Ru complex bearing a 4-hydroxy thiazol-substituted dppz (dipyridophenazine) ligand (RuTzOH) and its deprotonated form (RuTzO−). We combine steady-state and time-resolved absorption and emission spectroscopy with electrochemical investigations to characterize the excited state relaxation, which upon photoexcitation at 400 nm is determined by a multitude of initially populated MLCT states for both complexes. Subsequently, for RuTzOH, two long-lived excited states are populated, leading to dual emission from the complexes, a feature that vanishes upon deprotonation. Upon deprotonation, the electron density on the dppz moiety increases significantly, leading to rapid energy populating ligand-centered states and thus deactivating the initially excited MLCT states.
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Germany (DE)How to cite
APA:
Müller, C., Kaufmann, M., Brandon, M.P., Cullen, A.A., Dietzek-Ivanšić, B., & Pryce, M.T. (2023). New Twist on the Light-Switch Effect: Controlling the Fate of Excited States with pH in a 4-Hydroxy-thiazol-extended Ruthenium(II) Dppz Complex. Journal of Physical Chemistry A. https://dx.doi.org/10.1021/acs.jpca.3c06179
MLA:
Müller, Carolin, et al. "New Twist on the Light-Switch Effect: Controlling the Fate of Excited States with pH in a 4-Hydroxy-thiazol-extended Ruthenium(II) Dppz Complex." Journal of Physical Chemistry A (2023).
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