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UID:DSC-15685
DTSTART;TZID=Europe/Berlin:20190306T140000
SEQUENCE:1551830816
TRANSP:OPAQUE
DTEND;TZID=Europe/Berlin:20190306T150000
URL:https://www.dresden-science-calendar.de/calendar/en/detail/15685
LOCATION:IFW\, Helmholtzstraße 2001069 Dresden
SUMMARY:Dietzek: Photoinduced Electron- and Energy-Transfer in Molecules an
 d Materials
CLASS:PUBLIC
DESCRIPTION:Speaker: Prof. Dr. Benjamin Dietzek\nInstitute of Speaker: Leib
 niz-Institute of Photonic Technology Jena (IPHT) and Group Molecular Photo
 nics University Jena\nTopics:\nMaterialien\, Physik\n Location:\n  Name: I
 FW (A1E.10\, Hörsaal\, IFW Dresden)\n  Street: Helmholtzstraße 20\n  Cit
 y: 01069 Dresden\n  Phone: \n  Fax: \nDescription: Photoinduced electron a
 nd energy transfer are immanent to solar-energy-conversion processes. This
  contribution elucidates on recent examples in our group to study excited 
 state excitation transfer processes in non-conventional samples and settin
 gs. On the one hand fluorescence upconversion by triplet-triplet annihilat
 ion is demonstrated for a fully polymer-integrated material\, i.e. in the 
 limit of restricted diffusion. Organic sensitizer and acceptor are covalen
 tly attached to the poly(methacrylate) backbone\, yielding a metal-free ma
 cromolecular all-in-one system for fluorescence upconversion. A photophysi
 cal model taking the heterogeneous local environment within the polymers i
 nto account is proposed. On the other hand this contribution will discuss 
 our recent advances in elucidating the properties of electronically excite
 d states in intermediates of multi-electron transfer cascades\, which are 
 key to the function of e.g. natural and artificial photosynthesis. It will
  be reported on experimental developments to combine resonance Raman spect
 roscopy and ultrafast time-resolved transient absorption spectroscopy with
  electrochemical methods\, in particular cyclovoltammetry and chronoampero
 metry. Such combination allows us to electrochemically generate molecular 
 species mimicking the intermediates in multi-electron transfer cascades an
 d – subsequently – characterize their excited-state properties spectro
 scopically. The talk will focus on two scientific examples\, one concernin
 g the oxidative spectroelectro-chemistry of photosensitizers potentially u
 sed in dye-sensitized solar cells. The second example addresses the proper
 ties reductively generated intermediates of photocatalytic hydrogen evolut
 ion reactions relying on Ru(II) complexes and triaryl chromophores as phot
 oactive sensitizer Units.
DTSTAMP:20260520T130347Z
CREATED:20190219T000755Z
LAST-MODIFIED:20190306T000656Z
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