Photophysical characterization of a ruthenium-based tetrameric pentacene complex
Hou Y, Papadopoulos I, Ferguson MJ, Jux N, Tykwinski RR, Guldi DM (2023)
Publication Type: Journal article
Publication year: 2023
Journal
Book Volume: 27
Pages Range: 686-693
Journal Issue: 1-4
DOI: 10.1142/S1088424623500645
Abstract
The synthesis of a ruthenium(II) tetramer (Ru(Lpc)4Cl2) bearing pyridyl pentacene-based ligands and its corresponding model complex lacking pentacene moieties (Ru(Lref)4Cl2) is presented. The formation of these tetramers is corroborated by 1H, 13C NMR, and IR spectroscopies, as well as X-ray crystallography and mass spectrometry. Photophysical properties of the tetramers are probed by steady-state and time-resolved transient absorption spectroscopy. Steady-state absorption and fluorescence assays suggest weak ground-state interactions between the pentacene moieties of Ru(Lpc)4Cl2 and sizeable metal-to-ligand interactions, which are ruthenium-to-pentacene based. Time-resolved transient absorption measurements reveal an ultrafast singlet-to-triplet transition that occurs on the femtosecond timescale and that yields vibrationally hot and solvent unrelaxed triplet excited states. After relaxation, these triplet excited states deactivate back to the ground state in less than 3 μs. These observations lead us to conclude that intersystem crossing outperforms photophysical processes such as singlet fission.
Authors with CRIS profile
Ilias Papadopoulos
Lehrstuhl für Physikalische Chemie I
Norbert Jux
Interdisziplinäres Zentrum für Molekulare Materialien
Dirk Michael Guldi
Lehrstuhl für Physikalische Chemie I
Additional Organisation(s)
Involved external institutions
Canada (CA)How to cite
APA:
Hou, Y., Papadopoulos, I., Ferguson, M.J., Jux, N., Tykwinski, R.R., & Guldi, D.M. (2023). Photophysical characterization of a ruthenium-based tetrameric pentacene complex. Journal of Porphyrins and Phthalocyanines, 27(1-4), 686-693. https://doi.org/10.1142/S1088424623500645
MLA:
Hou, Yuxuan, et al. "Photophysical characterization of a ruthenium-based tetrameric pentacene complex." Journal of Porphyrins and Phthalocyanines 27.1-4 (2023): 686-693.
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