Dresden 2011 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 34: Photochemistry
MO 34.5: Vortrag
Freitag, 18. März 2011, 11:30–11:45, TOE 317
Time-resolved Spectroscopy of [Ir(ppy)2(bpy)]+ within a Photocatalytic System — •Antje Neubauer1, Aleksej Friedrich1, Felix Gärtner2, Henrik Junge2, Matthias Beller2, and Stefan Lochbrunner1 — 1Universität Rostock, Universitätsplatz 3, 18051 Rostock — 2Leibniz-Institut für Katalyse Rostock, Albert-Einstein-Str. 29a, 18059 Rostock
Iridium (III)-complexes have recently regained high attention especially in the field of organic light-emitting diodes and as photo-sensitizers in homogeneous water-reducing systems. For the latter application typically a photo-sensitizer is used to absorb light, and to transfer subsequently electrons to a catalyst, which actually reduces the water to generate molecular hydrogen. Often a sacrificial reductant (SR) serves as an electron source in order to avoid oxygen evolution. However, the notion about the involved processes in those complex systems is quite vague and only little is known about the responsible mechanisms and the factors determining the efficiency.
We present here mechanistic studies of a heteroleptic Ir(III)-complex in different solutions within the framework of an iron-based photo-catalytic water-reducing system,[1] and by means of time-resolved photoluminescence and femtosecond transient absorption spectroscopy. The results elucidate the impact of the solvent mixture for the investigated photo-catalytic system.
[1] F. Gärtner et al., Angew. Chem. 2009, 121, 10147.