Dresden 2017 – wissenschaftliches Programm
CPP 26.6: Vortrag
Dienstag, 21. März 2017, 15:15–15:30, ZEU 260
Following a Photocatalytic Redox Cycle using Fluorescence Correlation Spectroscopy — •Josef Haimerl1, Jan Vogelsang1, Indrajit Ghosh2, Burkhard König2, and John Lupton1 — 1Institut für angewandte und experimentelle Physik, Universität Regensburg — 2Institut für organische Chemie, Universität Regensburg
Rhodamine dye-based photo-induced redox catalytic processes hold great importance as efficient and, moreover, cheap alternatives to already existing transition metal-based photocatalytic processes. Recent examples show that consecutive photo-induced electron transfer processes (conPET)overcome the energetic limit of using the energy of only a single photon in photoredox catalysis. However, often, it is not clear which excited states of the photcatalysts are involved in such processes and how solvents (e.g. solvent polarity), reductants or oxidants impact the dynamics of these systems. We therefore present the use of fluorescence correlation spectroscopy (FCS) and time-correlated single photon counting(TCSPC) in order to understand the details of such photoredox catalytic processes, as well as to characterise the steps that are crucial in those photocatalytic cycles with the corresponding efficiencies .