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Sökning: WFRF:(Serroni S)

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1.
  • Andersson, Johan, et al. (författare)
  • New paradigm of transition metal polypyridine complex photochemistry
  • 2004
  • Ingår i: Faraday Discussions. - : Royal Society of Chemistry (RSC). - 1364-5498. ; 127, s. 295-305
  • Tidskriftsartikel (refereegranskat)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 ( less than or equal to 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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2.
  • Andersson, Johan, et al. (författare)
  • Ultrafast singlet energy transfer competes with intersystem crossing in a multi-center transition metal polypyridine complex
  • 2004
  • Ingår i: Chemical Physics Letters. - : Elsevier BV. - 0009-2614. ; 386:4-6, s. 336-341
  • Tidskriftsartikel (refereegranskat)abstract
    • Transition metal polypyridine complexes are finding widespread applications within many areas of chemistry. For their light-induced processes, the generally accepted picture is that all function emanates from triplet states because the singlet states initially prepared by light absorption are depopulated via intersystem crossing on the 100-fs time scale, before they are significantly involved in chemical reactions. Here we show that this is not always true. With ultrafast spectroscopy applied to a (ruthenium)(3)-osmium complex we show that transition metal polypyridine complexes can be designed where energy transfer between excited singlet states located on different metal centers efficiently competes with intersystem crossing, thus decreasing population of the lower-lying triplet states and concomitant energy loss. (C) 2004 Elsevier B.V. All rights reserved.
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Pascher, Torbjörn (2)
Sundström, Villy (2)
Yartsev, Arkady (2)
Andersson, Johan (2)
Puntoriero, F (2)
Serroni, S (2)
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Polivka, Tomas (2)
Campagna, S (2)
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2004 (2)

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