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Excitation Power Modulates Energy-Transfer Dynamics in a Supramolecular Ru-II-Fe-II-Ru-II Triad

Artikel i vetenskaplig tidskrift
Författare Joachim Kubel
M. Wachtler
B. Dietzek
Publicerad i Chemphyschem
Volym 18
Nummer/häfte 20
Sidor 2899-2907
ISSN 1439-4235
Publiceringsår 2017
Publicerad vid Institutionen för kemi och molekylärbiologi
Sidor 2899-2907
Språk English
Länkar 10.1002/cphc.201700710
Ämnesord energy transfer, photophysics, photosynthesis, time-resolved spectroscopy, transition metals, singlet-singlet annihilation, light-harvesting antenna, 2-photon, absorption, ultrafast dynamics, photosystem-ii, z-scheme, state, photoprotection, photosynthesis, dissipation, Chemistry, Physics
Ämneskategorier Kemi

Sammanfattning

Multichromophoric arrays are key to light harvesting in natural and artificial photosynthesis. A trinuclear, symmetric Ru-II-Fe-II-Ru-II triad may resemble a light-harvesting model system in which excitation energy from donor units (Ru-terpyridine fragments) is efficiently transferred to the acceptor (the Fe-terpyridine fragment). The photoinduced dynamics after simultaneous excitation of more than a single chromophoric unit (donor/acceptor) at varying excitation fluence is investigated in this contribution. Data suggests that energy transfer is decelerated if the acceptor states (on the Fe-II unit) are not depopulated fast enough. As a consequence, the lifetime of a high-lying excited state (centered on either of the Ru-II units) is prolonged. A kinetic model is suggested to account for this effect. Although the proposed model is specifically adopted to account for the experimental data reported here, it might be generalized to other situations in which multiple energy or electron donors are covalently linked to a single acceptor site, a situation of interest in contemporary artificial photosynthesis.

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