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Preparation of Polyoxometalate-based Photo-responsive Membranes for the Photo-activation of Manganese Oxide Catalysts
Published on: August 7, 2018
New paradigm of transition metal polypyridine complex photochemistry
Johan Andersson1, Fausto Puntoriero, Scolastica Serroni
1Department of Chemical Physics, Lund University, S-221 00 Lund, Sweden.
Abstract:
Using polarization sensitive ultrafast transient absorption spectroscopy we have studied energy transfer and excited state relaxation pathways in a tetranuclear transition metal [(osmium)(ruthenium)3] polypyridine complex. Contrary to the generally accepted picture of transition metal complex photochemistry we find that ultrafast energy transfer (< or =60 fs) occurs from the excited singlet MLCT state of the peripheral Ru-chromophores to the central Os-core, in efficient competition with intersystem crossing. Energy transfer between relaxed triplet MLCT states is more than an order of magnitude slower (600 fs).
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